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View Full Version : Offered Service for Amiga 4000 3000 2000 1200 600 A3640 A3630 capacitor, SIMM socket, HDD&FDD port repair or replacement



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tbtorro
6th October 2014, 20:20
Since I've had many questions about recapping, here is my official opinion:

Recapping Amiga boards is a must, and not an option. People often ask me to recap faulty boards AFTER it's too late, when the damage is too much to repair. Recap in those cases WILL NOT fix problems. So please recap while your board is still working, this is PREVENTIVE.

Electrolyte is a translucent liquid, and can't be spotted until it's too late. It can damage IDE ports, tracks, components, audio area. Bottom line: The cost of recap is MUCH lower than the cost of repairs. The endangered species are: A3640 CPU cards, A4000D, A4000T/port modules, A1200, CD32 and A600.
A500 and A2000 A3000 models are better to recap if the machine fails as those caps seldom leak (they usually dry out). All old barrel batteries must be removed ASAP.

Please note that currently I cannot accept repairs due to lack of time (repairs are very unpredictable) I have a full time job and my queue is constantly full with recaps and upgrades.

There are other places that offer recap, BUT what I guarantee is that you get absolutely correct, professional quality, IPC production level soldering work (take a look at my reference pictures below). I've seen many bad recap jobs with burned connectors, pads and components, or just badly soldered. This does not happen with my work. I use professional tools and supplies, and brand capacitors (Panasonic, Nippon Chemicon, Rubycon etc.). I provide full transparency of what work is being done and in what quality (with closeup pictures, as opposed to just snapping random photos of the whole boards where possible hidden errors can't be seen. There are very few people who can do good rework on old Amiga boards.

First, declare interest here on the thread, then send me a PM.

Be prepared to disassemble your system and have high resolution photos ready of your board(s) including close-ups of the caps. I only offer the services that are listed, other services are decided on case-by-case basis.

- A4000D 4000T capacitor replacement service
- Blizzard 1240 -> 1260 upgrade and cooling check, fan speed control
- Cyberstorm MK II 68040->68060 upgrade, cooling check
- Cyberstorm MK I/II/III SIMM socket replacement
- A4000/A3000 and accelerators CPU slot repair (new CPU slot)
- A4000D new RAM sockets with metal clips (if your RAM modules don't stay in their socket anymore)
- A4000D PIO2 upgrade (~30% IDE speed increase)
- A3640, A3630 cpu board capacitor replacement service + polarity fix
- A3640 cpu board upgrade to Rev 3.2 with socketed GALs
- A4000/3000/2000 Zorro slot replacement service
- A4000 FDD read/write problems CIA replacement, new chips + socket
- A4000 Buster 7 or 9 upgrade to Super Buster 11
- A4000 KS ROM 3.1 upgrade
- A4000 IDE/FDD port repair
- A4000 Audio circuit repair
- A4000 battery swap to professional Lithium coin cell kit (will never leak)
- A4000 battery removal and cleanup, (free with any other service IF there is no damage)
- A1200/A600 capacitor replacement service
- A1200/A600 IDE and FDD port replacement service
- A1200 accelerators RAM socket replacement, cooling check, fan speed control
- Track repairs IF the damage is clearly due to damaged tracks/lifted pads.

These are the conditions:

- I always test the board before and after work.
- You must ship the board WELL protected, and ESD safe.
- I follow the queue - first come first serve
- Please understand that this is old hardware and faults could happen ANY TIME.
- I cannot guarantee that I can fix any fault. Many hw. are missing schematics, some logic chip contents are impossible to find etc.

Feedback: Please leave feedback as per the site rules after you've received your stuff. Here is a guide how:
http://www.amibay.com/showpost.php?p=60784&postcount=3

NEW! Please consider my premium packages offered here:

Premium service for Amiga 1200 (http://www.amibay.com/showthread.php?85186)
Premium upgrade service for Amiga 4000 (http://www.amibay.com/showthread.php?85183)

Reference:

Video of how I do recaps:T


https://www.youtube.com/watch?v=mjCa0DAEpzQ

Before cleanup. Clearly, leaking capacitors can cause damage:

103286

After cleanup and soldering new capacitors:

103287 103288 103289 103290 103291

SIMM socket, CPU, and PLCC chip removal:

96972 96973 101909 96975




Fitzsteve
complete, shipped


tekk
complete, shipped


Clarkey
complete, shipped


Lechuck
complete, shipped


ozymandias
complete, shipped


EFTPOTRM
complete, shipped


spaceman
complete, shipped


SavageToe
complete, shipped


ting
complete, shipped


fille1976
complete, shipped


Amon_RA
complete, shipped


mikem
complete, shipped


TylerD
complete, shipped


1NOM155
complete, shipped


everblue
complete, shipped


udihow
complete, shipped


k0x
complete, shipped


Juzz
complete, shipped


RuneRider
complete, shipped


Wally
complete, shipped


warr8or29
complete, shipped


LoopHead
complete, shipped


local work x3 boards
complete, shipped


Whisper
complete, shipped


local work 1x board
complete, shipped


Blue-Faith x 2
complete, shipped


daloway x 3
complete, shipped


local work x 2 boards
complete, shipped


warr8or29 x 2 CD32 recap
complete, shipped


local work x 1 A3640 recap
complete, shipped


Amon_RA x 1 A4000 full refurbish
complete, shipped


suave x 1 A1200 recap and checkup
complete, shipped


raketa x 1 A4000 refurbish
complete, shipped


Jaxx x 1 A1200 recap
complete, shipped


Local work x 1 A1200 recap
complete, shipped


Local work x 1 A4000
complete, shipped


k0x x 1 A4000T 1xA1200 recap and repair
complete, shipped


elius1978x 1 x A1200 recap checkup
complete, shipped


Gouky CS Mk I faulty CPU slot, SIMM sockets, cooling
complete, shipped


Juzz A4000D recap, sockets, PIO2, RTC refurbish
complete, shipped


JohnFante A1200 recap, timing fix, RF removal
complete, shipped


helgebl A4000D refurbish, A600 recap, A3630 recap
complete, shipped


uunek A4000D refurbish, A3630 recap
complete, shipped


AndersHP A1200 recap, RF removal
complete, shipped


joachimrs 2xA4000 diag, A3630 A3640 recap
complete, shipped


local work A4000D diag, A3630, Cyberstorm PPC diag
complete, shipped


hoebedoelu 3xA1200 recap, IDE port fix, FDD flicker fix, RF removal
complete, shipped


Wrangler A4000 riser slot fix, A1200 recap
complete, shipped


Whisper 2 x A1200 recap
complete, shipped



local work 1 x A1200 recap
complete, delivered


local work 2 x A600 recap
complete, delivered


local work 1 x A4000 2 x A3640 recap, +audio fix
complete, delivered


local work 1 x A1200 1 x A600 recap
complete, delivered

[/TR]

fresh46664 Blizzard 040->060 upgrade
complete, delivered


TGE 1 x CD32 recap
complete, delivered


daloway 3 x A600 recap
complete, shipped


local work 1 x A4000T recap
complete, delivered


local work 1 x CD32 recap
complete, delivered



local work 1 x A4000D recap
complete, delivered



outside Amibay goldengate 486 repair
complete, shipped



ciVic 1 x A4000D 1xA600 recap
complete, shipped


local work 2 x A4000D 1xCD32 recap
complete, shipped


treintje 1 x GVP SIMM socket change
complete, shipped


richv 1 x A3640 diagnosis and upgrade
complete, shipped


A10001986 1 x A3640 upgrade to Rev 3.2
complete, shipped


gounderset 1 x A1200 1 x PIV recap
complete, shipped


local work 1 x A1200 recap and cleanup
complete, delivered


Juzz 2 x CD32 recap
complete, delivered


GregBR A4000D, A3640 recap, SIMM socket
complete, shipped


A10001986 A3640, recap, Rev3.2 update
complete, shipped



Bester B1240 060 upgrade, SIMM socket change + recap
complete shipped



Kunglao B1260 CPU upgrade
complete



[/TR]

tbtorro
20th October 2014, 13:45
Still offered.

fitzsteve
20th October 2014, 13:58
Hi!

Can you do assembly of the 040-060 adapters sold here:

http://www.amibay.com/showthread.php?65526-68040-68060-Adapter-%28for-a3640-Warpengine%29-Complete-Kit-NEW-VERSION

I have one but lack the skillz!

tbtorro
20th October 2014, 14:29
Hi!

Can you do assembly of the 040-060 adapters sold here:

http://www.amibay.com/showthread.php?65526-68040-68060-Adapter-%28for-a3640-Warpengine%29-Complete-Kit-NEW-VERSION

I have one but lack the skillz!

Yes, no problem, if you have all the (correct) parts. It's quite more time consuming than the recap service - but it will be included in the free first job offer :) Just drop me a PM Steve.

fitzsteve
20th October 2014, 14:32
Hi!

Can you do assembly of the 040-060 adapters sold here:

http://www.amibay.com/showthread.php?65526-68040-68060-Adapter-%28for-a3640-Warpengine%29-Complete-Kit-NEW-VERSION

I have one but lack the skillz!

Yes, no problem, if you have all the (correct) parts. It's quite more time consuming than the recap service - but it will be included in the free first job offer :) Just drop me a PM Steve.

Hi my friend, I don't mind to pay for the work :)

I'll drop you a PM

baz
20th October 2014, 18:19
Hi m8

I have the upgrade kit for my warpengine and i m not confident enough to solder the parts and have all the components also could you fit new sim sockets on my warpengine?

Baz

tbtorro
20th October 2014, 19:11
Hi m8

I have the upgrade kit for my warpengine and i m not confident enough to solder the parts and have all the components also could you fit new sim sockets on my warpengine?

Baz

Hi Baz, you have my answers via PM.

tbtorro
22nd October 2014, 21:20
Now also offering SIMM sockets replacement to angled sockets with metal clips.

DoctorQ
25th October 2014, 14:07
How much for recapping two x a4k motherboards and replacing the simm sockets as well? One of the motherboards might be a cr one.

how much for recapping a a3640?

tbtorro
25th October 2014, 18:02
How much for recapping two x a4k motherboards and replacing the simm sockets as well? One of the motherboards might be a cr one.

how much for recapping a a3640?

Answers sent via PM.

Bastich
25th October 2014, 20:16
Can you recap an A3400 which has an EC030? It's the original CPU card from my A4000.

tbtorro
25th October 2014, 20:20
Can you recap an A3400 which has an EC030? It's the original CPU card from my A4000.

Yes, no problem. Sending PM.

tbtorro
29th October 2014, 14:40
Parts received from fitzsteve.

fitzsteve
29th October 2014, 14:46
Parts received from fitzsteve.

Thanks for the conf.

:D

tbtorro
1st November 2014, 11:38
Work started on fitzsteve's board.

tbtorro
1st November 2014, 14:14
SMD components complete:

78364783657836678367

Getting ready for the 040 socket:

7836878369

The bottom board is done:

7851778518

Building the upper board and the finished socket:

7851978520

fitzsteve
1st November 2014, 14:16
Thanks for the update, looking good :D

tbtorro
2nd November 2014, 23:31
Your board is done Steve, shipping back..

7852178522

fitzsteve
2nd November 2014, 23:47
Fantastic, will drop you a PM tomorrow :)

tbtorro
3rd November 2014, 13:10
Fantastic, will drop you a PM tomorrow :)

Shipped!

tbtorro
7th November 2014, 16:33
Now also offering SIMM socket replacement for A1200 accelerator cards

fitzsteve
8th November 2014, 14:32
Thanks for the excellent service, I got my 040-060 adapter back today - very professional job :)

Cheers :thumbsup:

tbtorro
9th November 2014, 15:11
Thanks for the excellent service, I got my 040-060 adapter back today - very professional job :)

Cheers :thumbsup:

You are most welcome Steve. Feedback returned.

tbtorro
16th November 2014, 16:16
Now also offering A1200 recap and track repairs.

tbtorro
16th November 2014, 18:19
Can any of the @mods change the title to: "A4000 A1200 A3640 capacitor and SIMM socket replacement service" - thank you.

Sardine
17th November 2014, 00:27
done

TheDungeoneer
20th November 2014, 18:50
Interested in the A1200 recapping service for my poor miggy. Sending PM

tbtorro
21st November 2014, 16:04
Interested in the A1200 recapping service for my poor miggy. Sending PM

Answers sent via PM

tbtorro
23rd November 2014, 16:59
Work agreed with TheDungeoneer, waiting for shipment.

Qvision
11th December 2014, 17:34
Just wanted to ask if you make repairs.
I got 2 amiga 4000 moderborads thats not working.
Just grey screen.

I live in sweden.

Regards Qvision

tbtorro
11th December 2014, 20:53
Hi, yes simple repairs I can do, but not advanced diagnosis. Please drop me a PM to discuss further.

tbtorro
29th December 2014, 14:50
Still offered

birrax
9th January 2015, 11:17
Still offered
I have 2 A4000 desktop, and both need some cares... Can i send u some pictures for u to see?

tbtorro
9th January 2015, 13:05
Sure pictures always help, please make close ups too if some areas need special attention.
Just drop me a PM with the exact description of the work and we can discuss further.

tekk
17th January 2015, 21:02
Declaring interest on recap/cleaning of the mother- and cpuboard of my A4000/040

tbtorro
19th January 2015, 11:29
Declaring interest on recap/cleaning of the mother- and cpuboard of my A4000/040

Work agreed with tekk - waiting for the delivery.

tbtorro
23rd January 2015, 18:13
Motherboard received from tekk.

kronuz
23rd January 2015, 19:02
Sending PM

ColourWheel64
23rd January 2015, 19:18
How much do your services cost?

kronuz
23rd January 2015, 19:22
woops...this is not a PM :)

tbtorro
23rd January 2015, 22:05
How much do your services cost?

Sending PM.

tbtorro
25th January 2015, 15:13
Work started on tekk's board.

The first order of business is to clean up the battery area. There was lots of corrosion and residue on the RTC latch chip, but after some cleanup and measurements it seemed that no tracks were cut yet. However, the acid has leaked under the chip, so I have decided to remove the chip, clean under and resolder it. There was a lot's of gunk underneath and some of the legs barely made contact as the acid has eaten away the solder. Before and after pictures:

8226882269

tbtorro
25th January 2015, 18:02
Work complete on tekk's boards. A4000 Rev B and A3640 recap and battery cleanup.

Clarkey
25th January 2015, 20:28
Payment sent for recap on
4000d
Riser
A3630
A3640 and palarity fix

Thanks

tbtorro
25th January 2015, 21:11
Payment sent for recap on
4000d
Riser
A3630
A3640 and palarity fix

Thanks

Payment received

tbtorro
30th January 2015, 16:44
tekk's boards has been shipped back today

fitzsteve
2nd February 2015, 10:22
Hi tbtorro, would you be able to service an amigaone xe motherboard with new capacitors? I'm wondering if a recap would solve my lockup issues.

tbtorro
2nd February 2015, 12:30
Hi tbtorro, would you be able to service an amigaone xe motherboard with new capacitors? I'm wondering if a recap would solve my lockup issues.

Hi Steve, yes - no problem, but I'll need extra time probably to source the capacitors, as I only have parts in stock for Amiga models. Drop me a PM to discuss further.

fitzsteve
2nd February 2015, 13:05
Thanks mate. Will be in touch later by pm ☺

tbtorro
4th February 2015, 18:38
Boards received from Clarkey.

tbtorro
7th February 2015, 22:25
Work complete on Clarkey's boards. Few pictures

8289582896828978289882899

Clarkey
8th February 2015, 13:49
Thanks for the update looks great, can't wait to see it in person and fire her up again.

tbtorro
13th February 2015, 08:45
Clarkey's boards has been shipped back.

Clarkey
13th February 2015, 21:56
Received the boards, that was quick!

Really really pleased with the work you have done thanks, I can thoroughly recommend your services to others. I haven't had a chance to rebuild her yet but looking at the quality of the work I expect no issues :)

tbtorro
14th February 2015, 12:45
Excellent, your MB is good for another 20 years.


Received the boards, that was quick!

Really really pleased with the work you have done thanks, I can thoroughly recommend your services to others. I haven't had a chance to rebuild her yet but looking at the quality of the work I expect no issues :)

tekk
14th February 2015, 21:35
Thanks TBTorro for fixing my MB and other stuff. Brilliant work and you were very very helpful in getting things done! Cheers!

tbtorro
15th February 2015, 09:06
Thanks TBTorro for fixing my MB and other stuff. Brilliant work and you were very very helpful in getting things done! Cheers!

You're most welcome. Feedback returned.

Clarkey
15th February 2015, 21:04
Akk rebuilt and working perfectly audio and much better. Feedback left.


Excellent, your MB is good for another 20 years.


Received the boards, that was quick!

Really really pleased with the work you have done thanks, I can thoroughly recommend your services to others. I haven't had a chance to rebuild her yet but looking at the quality of the work I expect no issues :)

tbtorro
18th February 2015, 12:05
Added new service: A4000/3000/2000 Zorro slot replacement service. Also offered on any risers with Zorro slot connectors.

tbtorro
4th March 2015, 17:31
Still offered

tbtorro
22nd March 2015, 12:56
Still offered

Lechuck
23rd March 2015, 15:43
Please check my thread http://www.amibay.com/showthread.php?71239-Need-soldering-skills-expertise-on-Apollo-1230-mk3-accelerator
P.m sent for details on cost.

tbtorro
23rd March 2015, 19:22
Please check my thread http://www.amibay.com/showthread.php?71239-Need-soldering-skills-expertise-on-Apollo-1230-mk3-accelerator
P.m sent for details on cost.

Hi, you have my replies by PM

Lechuck
31st March 2015, 06:53
Accelerator was sent for service to tbtorro yesterday ;)

ozymandias
4th April 2015, 07:45
My a1200 needs a recap. PM sent.

tbtorro
4th April 2015, 13:49
My a1200 needs a recap. PM sent.

You have my answers via PM.

tbtorro
6th April 2015, 18:36
Payment received from ozymandias for A1200 recap and cleanup.

tbtorro
7th April 2015, 12:02
Payment received from Lechuck for SIMM socket replacement and maybe other fixes on his accelerator.

tbtorro
11th April 2015, 22:24
Work started on Lechuck's card

tbtorro
14th April 2015, 11:20
My a1200 needs a recap. PM sent.

A1200 motherboard was received from ozymandias.

tbtorro
19th April 2015, 20:28
Some updates on Lechuck's Apollo 1230, I was able to take a look today, and there was a number of problems. As some of you may have read it on Lechuck's thread, the original symptom was that no RAM was recognized in the card.

The first problem with this board was that some of the components (oscillator, jumper headers, and SIMM socket) was replaced by someone (not factory) and that person has done a rather poor soldering job.. Many pins were badly oxidized probably because of incorrect solder/temperature/tools were used. Worse yet, some pads on the jumper pins and the SIMM socket were warped and partly damaged. Luckily they all had continuity to the tracks so eventually after re-soldering/reflowing they were fine:

86698 86699 86700

The next issue was that the SMD capacitor next to the jumpers has leaked and badly corroded the pads underneath. This was replaced. Furthermore one of the F257 buffer chips was faulty. I've decided to replace all 3 of them:

86702 86703

After some diagnosis, the next step was to add the SIMM sockets. At this point I was worried about the removed socket's pads (if some damage was done inside the layers) so I've decided to add the second slot first, (because those pads were still factory and undamaged) to make sure that the RAM logic is fine. So worst case at least one SIMM socket will be functional. After testing the RAM, I've added the second socket too. If you look closely you may notice how poorly the oscillator pins were soldered:

86709 86710

In the end both sockets were functioning fine. Here is the card happily buzzing away with 64MB RAM (which is the max). Usually I loop Elite II intro for a few hours as stress test for the heavy polygon graphics and music:

86712 86713 86715

Lechuck
20th April 2015, 06:51
And that is some pro work:thumbsup:

I am really glad I send the card over to tbtorro:thumbsup2:

Thanks a lot:bowdown:

tbtorro
20th April 2015, 16:32
A bit of extra work agreed with Lechuck, adding heatsink and FPU. Payment received.

tbtorro
23rd April 2015, 11:05
Work started on ozymandias' Amiga 1200 motherboard. Some work in progress updates:

Removed all the old capacitors, looks like ozymandias' call to replace them was past overdue. About 5 capacitors has leaked and corroded the board and some components around them. Notice how grey and dirty the joints and the surrounding area look like. What happens is that the acid leaks out to the board and attracts dust and fluff particles that stick to the board. Luckily all pads and joints still had continuity so the damage will stop after cleanup:

86862 86863 86864

This is how an original (factory) healthy joint looks like, from the same board. Notice how clean the area around, and the shinny surface of the joint in comparison. However it's still not guaranteed that the capacitor is OK, only that it's haven't leaked yet:

86865

The next problem is that I've noticed that few of the pins of the IDE connector was missing. When I probed the rest, about 5 of them snapped right off with a light touch. Which was very surprising because the IDE pins can take a decent amount of force.

On closer inspection, I found that the acid from a leaked capacitor ate away the copper pins. Each pin sits in a little 'cup' in the plastic socket and the acid, once seeps inside this 'cup' will slowly work the base of the pin. This happens because although on the surface the acid can dry and become less corrosive, when it's enclosed in a semi-closed space, then it can work for a long time. The effect is similar to how teeth get a cavity: bacteria create acid between the tooth and gum, that slowly break down your tooth at the base.

Notice how all the breaks are dirty/green/oxidized and not gold color as fresh copper should look like. On the last picture, that particular pin had a tiny bit of copper joining only in the corner, which was not enough to withstand even a light touch. I'll have to contact ozymandias to check if any pins remain in his IDE cable, because I could not find all the broken off pins. The exact same thing happened to this guy: Link (http://eab.abime.net/showthread.php?t=64583) This connector is definitely has to be replaced:

86871 86872 86873

tbtorro
27th April 2015, 11:02
Small update on ozymandias' A1200 board, the faulty IDE connector was removed and waiting for the replacement part (should arrrive this week).

This is what I've found under the port, the through hole plates are badly corroded by the acid from the leaked capacitor next to it. The problem is that they are very difficult to clean up, because of the damaged and contaminated plates have very poor heat transfer properties. Good news is that all plates had continuity to the connecting tracks:

87108

In comparison this is from the underside of the board of the same connector, healthy plates should look like this after rework:

87110

After the cleanup of the entire area. The top hole plates of the IDE connector are not perfect, but I did not want to re-heat them too many times, so this will have to do:

87111

tbtorro
29th April 2015, 16:40
FPU socket received for Lechuck's board - will finish this weekend.

supaduper
1st May 2015, 07:19
Hi Tbtorro great work did you heat gun the IDE header off or remove each pin one at a time ?

tbtorro
1st May 2015, 10:11
Hi Tbtorro great work did you heat gun the IDE header off or remove each pin one at a time ?

I find the safest and easiest way to remove headers like this is to clip the pins on the component side, then remove (pull off) the plastic base *very carefully*, and then remove each pin one at a time using a normal iron and a tweezer. Another option is to use a de-solder iron with an automatic pump, but this takes longer so I only use that method if I want to save the component. I never use a heat gun for component repair because it's difficult to control what's gets heated and what's not, unless you have correct nozzles for each components.

tbtorro
2nd May 2015, 14:00
Part (IDE header) received for ozymandias' A1200, will complete this weekend.

tbtorro
3rd May 2015, 02:01
Work complete on Lechuck's Apollo 1230, installed FPU + socket, shipping back on Monday

87412 87413 87414

tbtorro
4th May 2015, 22:06
Work complete on ozymandias' A1200, full recap and IDE connector fix.

87559 87560 87561 87562

tbtorro
6th May 2015, 11:40
ozymandias' A1200 motherboard has been shipped back today

tbtorro
6th May 2015, 19:53
Lechuck's board was shipped back also.

tbtorro
7th May 2015, 10:23
There is a long holiday weekend coming up next week in Denmark, with some extra time for me, so an offer for today only: Any (one) A1200 or A4000 A3640 A3630 recap for only EUR 5 (just to cover the parts and supplies) plus postage back. You need to be able to get your board delivered to me by 13th May for this to work.

First person to declare interest gets the offer.

Lechuck
7th May 2015, 19:07
Thanks to tbtorro and Danish post office card arrived today.Tested and played :blased: for about half and hour - everything working great.
Attaching some pics just for the fun of it.

Oh and if you ask why on earth did he install only 16mb when tbtorro installed 2 simm slots?

a)I don't think I will need more than 16
b)I am just glad the card works :) , don't really care about the amount of ram ;)

Thanks again tbtorro for your time and effort on this , you are the man:thumbsup:

tbtorro
10th May 2015, 14:29
Now offering A600 recap also and IDE / FDD port repair.

ozymandias
15th May 2015, 11:20
Received my board. Excellent work!!!! You are the best! :thumbsup: Feedback follows.

SavageToe
27th May 2015, 06:41
Hi Tbtorro,

Interested in sending you my Elbox 1230 for a service, as per our previous PM's

EFTPOTRM
5th June 2015, 10:09
Hi tbtorro,

I am interested in your service. I have got an A3640 that (most probably) needs new capacitators and (preferably) the 3.2 upgrade. Could you mail me the details please?

tbtorro
5th June 2015, 11:05
Received my board. Excellent work!!!! You are the best! :thumbsup: Feedback follows.

Great! Feedback returned.

- - - Updated - - -


Hi Tbtorro,

Interested in sending you my Elbox 1230 for a service, as per our previous PM's

Shipping, and other terms sent to SavageToe

- - - Updated - - -


Hi tbtorro,

I am interested in your service. I have got an A3640 that (most probably) needs new capacitators and (preferably) the 3.2 upgrade. Could you mail me the details please?

Hi EFTPOTRM, you have my PM.

tbtorro
6th June 2015, 20:48
Work agreed with EFTPOTRM for A3640 recap, polarity fix and Rev 3.2 upgrade - payment received.

tbtorro
9th June 2015, 09:46
Tracking info received from EFTPOTRM, waiting for the delivery.

tbtorro
11th June 2015, 14:45
EFTPOTRM's A3640 received today, work starts this weekend.

tbtorro
16th June 2015, 02:23
Some updates for EFTPOTRM's A3640, yet another board with leaked capacitors, it's very typical for the A3640 that the 3 capacitors that are mounted wrong by the factory leak first, because the reverse polarity operation drastically shortens the component's life:

90147 90148 90149

After the removal and cleanup. Fortunately the corrosion was minimal to the pads, so these will be as good as new:

90150 90152 90153

Getting ready for U209 swap:

90154

After U209 removal and cleanup:

90155 90156

While working on U209, I've noticed that U204 is sporting a label identifying the GAL as 391470-01 which is unusual as this revision is an early one (typically found on Rev 3.0's) and this is a Rev 3.1 card. and those I've seen so far all had U204 populated with 391470-02. Also the label of this GAL is different from the others, could it be that it's a re-used chip containing 391470-02? Has anyone seen 3.1 cards with this GAL? Anyway, I'll have to contact EFTPOTRM to decide what to do, as according to the label this is an early GAL, and if left as is, the card won't be a Rev 3.2, but something in between..

90157

Hoping to continue tomorrow with the recap and socketing U209.

ting
16th June 2015, 21:23
Hi. Please send PM with price to do an A1200. Rev 1D.4.
I would like a recap and testing so that I know it will work for many years to come:-)

tbtorro
17th June 2015, 22:31
Some progress on EFTPOTRM's A3640, recap and replacement of U209 complete, as agreed U204 will also be swapped to the latest revision - as soon as I receive the parts for it.

90291 90292

spaceman
19th June 2015, 05:04
Sent 2x A1200 board and 1x A4000 board from Australia to tbtorro earlier this week for recap and major surgery! ;-)

tbtorro
19th June 2015, 17:19
Sent 2x A1200 board and 1x A4000 board from Australia to tbtorro earlier this week for recap and major surgery! ;-)

Boards recived from spaceman, will take a look this weekend.

iddqd
20th June 2015, 10:29
Interested for an A1200, for the comming future.
Sending PM, with some Q.

tbtorro
20th June 2015, 15:57
Interested for an A1200, for the comming future.
Sending PM, with some Q.

PM replied.

- - - Updated - - -

EFTPOTRM's A3640 is complete, U209 U294 (Rev 3.2) upgrde, recap and polarity fix. Shipping back on Monday.

90402

tbtorro
20th June 2015, 19:47
This is how NOT to repair an A4000 motherboard.

OK, spent some time diagnosing spaceman's A4000 motherboard, and found some continuity problems mainly due to bad repair. The symptom is that no fast RAM is shown. There are also some video stability issues. The history of this board is unknown, but one thing is sure: there was both battery and capacitor leak on this board and it was repaired - very poorly. Usually I don't take assignments on boards with previous repairs and this one is the perfect example why. Just to be clear it was not repaired by spaceman, he is just the unfortunate buyer of this system.

Most of these damages are impossible now to clean up and rework reliably, at least not without many hours of testing, track (re)repairs, so I'll try to troubleshoot the RAM problem and leave the rest of the board as it is. Only a matter of luck if this board will go bad again or not.

It's amazing, almost every single capacitor solder job had a different example on how to do PCB rework wrong. With wrong tools, insufficient skills and wrong materials. Missing pads, unreliable joints, burned PCB, bad jump wires, SIMM socket pads overheated, PCB delaminated, have a look (ouch):

90405 90406 90407 90408 90409 90410 90411 90412 90413 90414

spaceman
21st June 2015, 12:09
Damn, so upset at the seller for being so dishonest. But really happy it is in good hand now, and at least my 2x A1200 will be attended to on time and only by tbtorro.

tbtorro
22nd June 2015, 09:28
Work began on spaceman's boards. 2 x 1200 recap and A4000 track repairs. Payment received.

tbtorro
23rd June 2015, 21:53
Quick update, work in progress on one of spaceman's A1200 boards, it's a Magic Pack Rev 1D4, supposedly brand new, but not immune to capacitor leaks. The usual suspects, one cap next to the IDE port and one near the RF modulator. Not a bad leak, IDE port luckily in good shape so no problem here. This board also have FDD reading problems with known good drives and disks - trying to see if it was due leaking caps. Otherwise the FDD controller has to be tested out:

90546 90547 90548

tbtorro
24th June 2015, 21:06
Another update on spaceman's MP A1200 board, caps replaced but FDD port is still faulty. Very strange, random floppy seeking activities on startup, no clicks, and of course NDOS errors, with real FDDs or GOTEKs all the same. Tested the CIA and as suspected it was faulty. After a new CIA installation the board is a happy camper reading/writing FDDs all good:

90604 90605 90609

The other Rev 1D4 A1200 board was suffering from the infamous 'Phillipines' flicker error. The screen flickers whenever the floppy drive or the HDD is accessed. This was fixed by installing a filter capacitor next to the IDE port. Take a look at the videos to see the error and after the fix:

Before video (https://www.youtube.com/watch?v=eWfZc7h1obI) After video (https://www.youtube.com/watch?v=5fTwKkH-Bhk)

90614 90615

spaceman
25th June 2015, 01:41
WOW, great job. I didn't even know about the infamous 'Phillipines' flicker error. Both the video links to the fixed one however, but I found the faulty video through your youtube channel. Thanks for fixing all these which I didn't even knew about (had not played with the A1200 much and it was a while back). So glad I sent you this.

tbtorro
30th June 2015, 06:03
2 x A1200 030 cards received from SavageToe, hoping to find time to take a look at them this weekend.

tbtorro
30th June 2015, 21:33
Payment received from ting for one A1200 recap.

tbtorro
1st July 2015, 22:04
Update on spaceman's A4000 board, all done, clean and stable video and RAM problems fixed.

Removal, cleanup and new video chip installation:

90899 90900 90901

After the removal and re-soldering of the SIMM socket:

90906

And the screenshots of the RAM test:

90907 90908

tbtorro
2nd July 2015, 12:22
A1200 motherboard has been received from ting today.

tbtorro
6th July 2015, 21:28
SavageToe's boards received, starting diagnosis..

jumpinjackson
8th July 2015, 10:28
Hello Tbtorro,

I have an A4000 board that I'm thinking to get recapped and checked.

The battery was removed years ago by the previous owner, I'm not sure if damage was done:

http://s5.postimg.org/mvqei848z/20150702_105809.jpg (http://postimg.org/image/mvqei848z/)

From what I can see, the IC contacts and the tracks left to the battery seem a bit battered.

The A4000 powers up and seem to works fine (Video out, disk drive, IDE with CF adaptor, RAM seem fine). I have installed OS3.9 and I did not experience issues so far, albeit with limited usage.
The only problem I'm getting is a Cybervision 64 3D VGA output not working. I'm not sure if the battery removal could be have damaged something related to the Zorro slots. The scan doubler second port from the Cybervision (plugged in the short end of the Zorro III slot) works properly.

Is this something you could look at? How much could it cost for recapping and the above diagnosing/eventual repair?

Thanks,

JJS

tbtorro
8th July 2015, 10:54
Hello Tbtorro,

I have an A4000 board that I'm thinking to get recapped and checked.

The battery was removed years ago by the previous owner, I'm not sure if damage was done:

http://s5.postimg.org/mvqei848z/20150702_105809.jpg (http://postimg.org/image/mvqei848z/)

From what I can see, the IC contacts and the tracks left to the battery seem a bit battered.

The A4000 powers up and seem to works fine (Video out, disk drive, IDE with CF adaptor, RAM seem fine). I have installed OS3.9 and I did not experience issues so far, albeit with limited usage.
The only problem I'm getting is a Cybervision 64 3D VGA output not working. I'm not sure if the battery removal could be have damaged something related to the Zorro slots. The scan doubler second port from the Cybervision (plugged in the short end of the Zorro III slot) works properly.

Is this something you could look at? How much could it cost for recapping and the above diagnosing/eventual repair?

Thanks,

JJS

Sending PM.

tbtorro
11th July 2015, 17:56
Update on SavageToe's cards:

The M-Tec 1230 is now working, installed 28Mhz oscillator (was missing) and jumpered the card. The card was jumpered to 8MB RAM and 4MB was installed which gave all kind of memory problems - this is fxed.

The Apollo 1230 had a second RAM socket installed - yet again: not very well - by someone. Unreliable joints, overheated pads etc.. the usual. Also one of the joints was shorted to the address lines (fixed)

91219

fille1976
12th July 2015, 20:59
hi tbtorro,

i have problems with my amiga.
can you fully check it and if needed recap it.
also can you check my blizzard 1260?
and as last my cfcard,cant get the 1260 libs on it.
i gona send you my amiga with acc card in it and cfcard,the amiga startup,but cant go in any dir,or it crashes.
its classic workbench 3.1-it have roms 3.1.
let me now if you want to do it?
and if you agree,pm me your address please.
grts filip

tbtorro
13th July 2015, 08:51
hi tbtorro,

i have problems with my amiga.
can you fully check it and if needed recap it.
also can you check my blizzard 1260?
and as last my cfcard,cant get the 1260 libs on it.
i gona send you my amiga with acc card in it and cfcard,the amiga startup,but cant go in any dir,or it crashes.
its classic workbench 3.1-it have roms 3.1.
let me now if you want to do it?
and if you agree,pm me your address please.
grts filip

Offer sent via PM.

tbtorro
15th July 2015, 21:06
Work complete on ting's board. A1200 1D4 full recap.

SavageToe
16th July 2015, 11:50
Works completed (tnx), Paypal payment sent..

tbtorro
16th July 2015, 12:18
Works completed (tnx), Paypal payment sent..

Full payment received - but the work is NOT complete yet.. Your Viper 1230 is configured and tested but the Apollo card still need the hw. fixes, will complete 25-26/07 as I'm on holiday this weekend.

tbtorro
16th July 2015, 22:42
ting's A1200 motherboard has been shipped back today.

fille1976
18th July 2015, 09:41
items shipped

tbtorro
19th July 2015, 21:48
items shipped

Payment received.

tbtorro
22nd July 2015, 22:29
Work complete on SavageToe's cards

tbtorro
24th July 2015, 18:34
items shipped

fille1976's boards have arrived today, will be taking a look this weekend.

fille1976
24th July 2015, 18:55
ok,thx

tbtorro
25th July 2015, 14:14
Work started on fille1976's boards A1200 recap, IDE port, 060 libraries check.

fille1976
25th July 2015, 14:19
Ok,fix everything you think its needed tbtorro.
Do you know someone to recap my Atari ste?

tbtorro
25th July 2015, 21:15
Update on fille1976 A1200, the usual suspects, several caps leaked around the audio circuit, one IDE port pin broken because of the acid of the leaking capacitor next to it. I can see that someone was trying to fish out the broken pin of the IDE cable (with no success). It's a wonder how this board was working at all.

So new caps, new IDE port and new IDE cable is needed. The Blizzard 1260 library install is complete, OS 3.9 and games run without freezes and resets now.

91863 91864 91865 91866 91867

- - - Updated - - -


Ok,fix everything you think its needed tbtorro.
Do you know someone to recap my Atari ste?

Nope, but also the STE does not use surface mount technology so no leaking SMD caps found on them. The radial capacitors are less susceptible for leaking so better replace them when actual problems arise.

fille1976
25th July 2015, 21:27
oh man,you make my day,really happy now.
take your time tbtorro,there is no rush by me,i have patience,and have toys enough to play with.
i readed about oxypatcher or hsmathlibs,but i cant buy them anymore.
is it worth to oc the 1260,now its 50 mhz i believe,to 70 mz?
its just the crystal replace?
or does it need better cpu,dont know what rev it is.
just ordered new shield,the upper and the bottom,so thats also new,what the other owner did with it,i dont know,but its totaly distorted.
he also cuts pieces out of it.

tbtorro
27th July 2015, 14:43
oh man,you make my day,really happy now.
take your time tbtorro,there is no rush by me,i have patience,and have toys enough to play with.
i readed about oxypatcher or hsmathlibs,but i cant buy them anymore.
is it worth to oc the 1260,now its 50 mhz i believe,to 70 mz?
its just the crystal replace?
or does it need better cpu,dont know what rev it is.
just ordered new shield,the upper and the bottom,so thats also new,what the other owner did with it,i dont know,but its totaly distorted.
he also cuts pieces out of it.

Overclocking your B1260 is eniterly up to you. In my view there is no point as OS3.9 and 99% of all classic software will run fast enough with a stock 50Mhz 060. Perhaps Doom or Quake would benefit from a higher FPS rate, other than that it's about running benchmarks and tweaking. Your CPU is an early XC version (Rev 1 I believe) which is perfectly fine at the speed and with the cooling you have.

Amon_RA
29th July 2015, 10:15
Work ordered a on Blizzard 1260 :



Replace the SIMM socket by a 90deg SIMM socket.
Replace the currrent noisy fan by a more silent solution.


Payment sent via PayPal.
Package sent today.

tbtorro
30th July 2015, 12:34
Work ordered a on Blizzard 1260 :



Replace the SIMM socket by a 90deg SIMM socket.
Replace the currrent noisy fan by a more silent solution.


Payment sent via PayPal.
Package sent today.

Boards received today, will try to complete them this weekend.

tbtorro
31st July 2015, 15:43
fille1976's boards are complete. A1200 full recap, new IDE port, new IDE cable, B1260 libraries install on OS3.9, B1260 cooling check and install.

Shipping back on Monday.

tbtorro
2nd August 2015, 12:11
Work started on Amon_RA's board, unfortunately the B1260 has developed some faults, had booting (black screen) issues, sometimes it would boot but most of the time it didn't. Clock signals and supply voltages on the 060 were fine. Checking the board under microscope showed no visible physical damage or bad soldering.

Lacking a schematic, I've decided to use brute force by checking for voltages on all pins of all chips. On the ROM chip some output pins didn't have any, even though according to the data sheet they should have 500 mV minimum, regardless of state. First I've thought it's a bad chip, but there was voltage on the pins but not on the pads. This 27C256 is a PLCC J-lead and I've missed some cracks under some of the leads until I've placed the card at an angle under microscope to look for them. Here is the result:

Zoom in, it's a bit hard to spot the pins:
92250

At high magnification, the cracks are apparent:
92251

After reflowing all the joints:
92252

The card is booting now without problems and stable. Will proceed for the SIMM socket swap.

tbtorro
2nd August 2015, 17:48
Amon_RA's B1260 is complete. New 90deg SIMM socket, moved the CPU fan lower on the card. The SIMM module is a very tight fit, but both clips clip on after a bit of encouragement. Waiting for parts for the fan speed controll, due next week to complete the work.

An interesting thing is that the 128MB RAM module has failed the extended tests at 80Mhz. I have experimented with different crystals and the highest speed it will run fine is 61Mhz. Another 64MB RAM module I have will run at 80Mhz without problems. Not sure why this is, but possibly the signals that feed the RAM module get distorted at higher clock speed, after all the card was not designed to run at 80Mhz. So looks like it can run a 64MB RAM module at 80Mhz or 128MB at 61 Mhz max. Or experiment with another 128MB module, but I doubt it's the module's fault.

92258 92262 92263 92264 92265 92266

tbtorro
6th August 2015, 12:19
fille1976's boards are shipped back today. Please don't forget the feedback once received - thank you

tbtorro
8th August 2015, 09:29
Amon_RA's Blizzard 1260 is complete. SIMM socket changed, ROM chip contact problem fixed, and fan speed control.

tbtorro
10th August 2015, 22:24
Amon_RA's Blizzard 1260 is shipped today.

fille1976
11th August 2015, 19:00
amiga working great,thx tbtorro for all your hard work.
really apreciate it.
itrader following

tbtorro
12th August 2015, 11:49
amiga working great,thx tbtorro for all your hard work.
really apreciate it.
itrader following

You are most welcome, feedback returned.

Amon_RA
13th August 2015, 10:54
Amon_RA's Blizzard 1260 is complete. SIMM socket changed, ROM chip contact problem fixed, and fan speed control.

Blizzard received yesterday and working perfectly.
Thank you so much for the detailed analysis, feedback and excellent work tbtorro!

iTrader feedback given.

tbtorro
14th August 2015, 12:17
Feedback returned, many thanks!

fille1976
16th August 2015, 21:59
Hi,

I got a small problem,send you pm.
Grts filip

k0x
17th August 2015, 04:53
Amon_RA's B1260 is complete. New 90deg SIMM socket, moved the CPU fan lower on the card. The SIMM module is a very tight fit, but both clips clip on after a bit of encouragement. Waiting for parts for the fan speed controll, due next week to complete the work.

An interesting thing is that the 128MB RAM module has failed the extended tests at 80Mhz. I have experimented with different crystals and the highest speed it will run fine is 61Mhz. Another 64MB RAM module I have will run at 80Mhz without problems. Not sure why this is, but possibly the signals that feed the RAM module get distorted at higher clock speed, after all the card was not designed to run at 80Mhz. So looks like it can run a 64MB RAM module at 80Mhz or 128MB at 61 Mhz max. Or experiment with another 128MB module, but I doubt it's the module's fault.



Was the problem with 128MB@80Mhz resolved somehow?

Isn't the Amon_RA's B1260 the DCE produced version?

tbtorro
17th August 2015, 15:48
Yes it was a DCE card, and was resolved with a simple hardware fix, details are further up the thread.

8bitplus
20th August 2015, 08:03
PM send regarding work on a BPPC card.

dayowalker
20th August 2015, 21:45
Hello

Interested in Your service. PM sent...


Gesendet von iPhone mit Tapatalk

zone
25th August 2015, 14:36
Interested. Will PM

CentralPerk
28th August 2015, 04:37
Declaring interest. PM sent with details.

tbtorro
31st August 2015, 10:50
All PM's answered with offers.

mikem
15th September 2015, 01:10
Accepted offer and have mailed A4000D motherboard & CPU board for capacitors, battery replacement & SIMM socket replacement. And anything else it might need!

tbtorro
15th September 2015, 18:18
Accepted offer and have mailed A4000D motherboard & CPU board for capacitors, battery replacement & SIMM socket replacement. And anything else it might need!

Work added to the queue - payment info sent to mikem - thanks.

tbtorro
16th September 2015, 08:16
Payment received from mikem

TylerD
1st October 2015, 21:08
Declaring interest. Will PM.

tbtorro
2nd October 2015, 21:42
Declaring interest. Will PM.

Agreed for drop-off some work from TylerD.

Gouky
3rd October 2015, 12:55
Possibly interested in an A4000 motherboard repair, sending pm with details

tbtorro
4th October 2015, 15:51
Possibly interested in an A4000 motherboard repair, sending pm with details

Work agreed with TylerD - A4000 recap, battery cleanup, 1 x SIMM socket change and B1260 diagnosis. Payment received.

tbtorro
8th October 2015, 17:28
Work started on TylerD's boards.

tbtorro
10th October 2015, 02:27
Work complete on TylerD's A4000 motherboard. Battery leak cleanup, first SIMM socket change, and recap.

This how the PCB looked around the first SIMM slot area, the acid has covered and oxidized the socket's pins, it did not look very good underneath either. The motherboard had some RAM test errors that would come and go:

95559 95560

After the cleanup and reflow of the pads:

95561 95562

The new socket is installed:

95563

One interesting thing is that on the second SIMM socket, some PIN's were not soldered. It seems that this was a manufacturing error. I have also considered that someone perhaps tried to de-solder this socket but the state of the pads is too perfect to have done this after manufacturing. I have re-flown both pins so the problem is fixed:

95564

TylerD
10th October 2015, 19:18
Absolutely wonderful to see tbtorro! Can't wait to pick it up and boot it with a clean conscience, and a certainty that this will last for a looooong time!

tbtorro
11th October 2015, 14:55
TylerD's boards are delivered today.

TylerD
12th October 2015, 11:47
Recieved the boards, and left feedback. Thanks again.

1NOM155
20th October 2015, 23:10
Hi tbtorro,

interested in A600 caps replacement.

tbtorro
21st October 2015, 08:13
Hi tbtorro,

interested in A600 caps replacement.

Work agreed with 1NOM155, payment received.

everblue
21st October 2015, 18:30
Interested in recapping service for an Amiga 1200 motherboard + Timing fixes if needed. Motherboard is on the way!

tbtorro
22nd October 2015, 11:35
Interested in recapping service for an Amiga 1200 motherboard + Timing fixes if needed. Motherboard is on the way!

Payment received - work added to the queue.

tbtorro
22nd October 2015, 21:57
Did some inspection and cleanup on Mikem's A4000/A3640 today. Both boards had multiple leaked capacitors, one of them on the A3640 has been leaking for a while because its' pads were completely corroded and the capacitor just fell off the board. Also shown is the state after cleanup:

96057 96058 96059

Here is two examples of leaked capacitors on the A4000 motherboard (audio circuit), when an area around a capacitor looks wet, then the capacitor has leaked. During testing I've also noticed that the filters are obviously not functioning too well, as entire frequency bands are missing from the audio output. Also noticeable is the grey/green residue on the surrounding components:

96065 96070

And to have some good news too, there was absolutely no battery leak, for future reference, this is how a battery area should look like. Everything is clean, tracks and overlays intact, shiny joints, with no sign of corrosion of tracks or pads:

96081

Will continue with the SIMM sockets during the weekend.

tbtorro
23rd October 2015, 09:30
Work received from everblue, will try to complete this weekend.

tbtorro
23rd October 2015, 18:04
Some progress on mikem's boards. SIMM sockets removal is complete. A3640 recap complete. Will finish and test the board tomorrow.

96099 96098

tbtorro
26th October 2015, 10:31
Some more updates on mikem's A4000 motherboard, unfortunately after recap the sound was still faulty, the right sound channel was missing on the output. I've found that the pads under C433 were corroded due to the leaking capacitor and some tracks were cut. C433 is the decoupling capacitor after the U402 op-amp right channel output, and the track was cut after the negative pin, so no signal towards U403 and eventually to the RCA output. Notice how also the edges of the pads look chipped as the acid was also eating away at the pads. The rim of the plated through-hole to the bottom left is also almost gone:

96241

tbtorro
27th October 2015, 12:13
Track repair is complete on mikem's A4000. Perhaps not my nicest looking work, but it'll hold and I really wanted to avoid using jump wires considering the short distance of the cuts:

96267 96268

Another issue was that the right RCA jack was quite oxidized and loose. Also for some reason the two RCA jacks mounted were of different types, perhaps the board was repaired in the past?

96269

After the removal of right RCA jack:

96270

Anyway, after the corrections the sound is all good and clear, left and right channels. Will proceed finishing the rest of the board.

tbtorro
27th October 2015, 19:22
So, this above is the perfect example why recap jobs should be done in time before leaking caps damage the board resulting to costly repairs.

Music test before recap and fix (https://youtu.be/8dy3CEZbes4)

Music test after recap and fix (https://youtu.be/_7QjBHTN6qA)

tbtorro
29th October 2015, 13:48
Some more work done on mikem's board:

Once again, weird FDD behavior due to failing CIA chips, say every 5th try there was an NDOS error on known good floppies. Both chips are replaced to play safe, brand new socketed chips installed. FDD reading is good and stable afterwards:

96357 96358 96363

Another minor issue discovered was that the CPU heat sealing compound has obviously dried out during the 20 odd years. A self-adhesive thermal pad was installed instead. These pads are a bit pricey, but they won't dry out, and the heat transfer is more uniform across the CPU surface:

96359 96360 96361 96362

tbtorro
29th October 2015, 17:34
Some inspection done on 1NOM155's A600 motherboard. As suspected an earlier recap job by someone did not go well. All through hole capacitors have been installed bad, too much solder, overheated pads, warped pads, and burned pads:

96371 96372 96373 96374

If the Death Star was built this way above it would have exploded by itself before the rebels gotten to it.

In comparison, this is how an ideal, healthy solder joint SHOULD look like (from the same board):

96375

tbtorro
30th October 2015, 22:15
Work complete on mikem's A4000 and A3640. Shipping on Monday.

A4000: Full recap, audio fix, RCA plug fix (right), 2xCIA fix, new SIMM sockets (metal clips), new lithium battery kit.
A3640: Recap, caps polarity fix, CPU thermal pad fix

96447 96448 96449

An interesting detail is that the A3640 card has the latest revision (according to the label anyway) U204 and U209 chips making this a Rev 3.2 card, however Rev 3.1 is printed on the silkscreen. The chips seem original so this must have been a late production run card where the chips are newer but the board still has the old printing:

96450 96451

Flynnsarcade
1st November 2015, 14:03
Could you possibly do my A4000 rev.b board it has a faulty cpu slot the pins have fallen away as well as on the a3640 board i have i would like both sockets replacing and a recap on both boards?

many thanks

tbtorro
1st November 2015, 14:35
Could you possibly do my A4000 rev.b board it has a faulty cpu slot the pins have fallen away as well as on the a3640 board i have i would like both sockets replacing and a recap on both boards?

many thanks

Sending PM.

tbtorro
2nd November 2015, 08:56
1NOM155's boards are complete. A600 recap correction, RF module removal (new RF module included), and DB25 adapter track repair. Shipping back in the next couple of days.

96555 96556 96557

Miru
2nd November 2015, 11:02
Very cool work tbtorro! Do you repair PSU`s too ? I have a blizzardk MKIV which only works when memory is disabled, dont know whats wrong with it, could you repair it?
I have a A2000 220V PSU, unfortunately no A2000s are for sale in Switzerland currently so I will have to leave my 2000 here in non working condition. U usually am in the USA.

tbtorro
2nd November 2015, 11:13
Very cool work tbtorro! Do you repair PSU`s too ? I have a blizzardk MKIV which only works when memory is disabled, dont know whats wrong with it, could you repair it?
I have a A2000 220V PSU, unfortunately no A2000s are for sale in Switzerland currently so I will have to leave my 2000 here in non working condition. U usually am in the USA.

I could take a look at your Blizzard, (sending PM) PSU repairs are not offered unfortunately.

tbtorro
2nd November 2015, 18:49
mikem's boards were shipped today.

CraigsBar
3rd November 2015, 23:54
Pm sent, possibly interested in a recap for my 600.

tbtorro
4th November 2015, 10:23
Pm sent, possibly interested in a recap for my 600.

PM sent with offer.

CraigsBar
4th November 2015, 19:43
Good offer made, but sometimes it is better to go with people you already know. The 600 therefore will be going to Dr. Bryce's surgery in Germany.

Thanks anyway and I hope to deal with you in the future.

tbtorro
5th November 2015, 07:09
1NOM155's boards are shipped back.

1NOM155
5th November 2015, 12:08
1NOM155's boards are shipped back.

Just receive it, work great. thanks for the job tbtorro (http://www.amibay.com/member.php?3679-tbtorro), going to leave feedback :)

tbtorro
5th November 2015, 18:26
1NOM155's boards are shipped back.

Just receive it, work great. thanks for the job tbtorro (http://www.amibay.com/member.php?3679-tbtorro), going to leave feedback :)

Great! :) Feedback returned.

k0x
7th November 2015, 12:21
PM sent.

mikem
8th November 2015, 04:25
Received my A4000 motherboard and processor card back today, all in beautiful condition. tbtorro's work is impeccable, very clean and professional! The only way to tell any work was done is the nice shiny solder joints and beautiful new components. He packaged everything up safe and securely, and it all arrived back in the USA within a week!! All of my Amigas will be making the trip to Denmark for refurbishing!

tbtorro
8th November 2015, 13:20
Received my A4000 motherboard and processor card back today, all in beautiful condition. tbtorro's work is impeccable, very clean and professional! The only way to tell any work was done is the nice shiny solder joints and beautiful new components. He packaged everything up safe and securely, and it all arrived back in the USA within a week!! All of my Amigas will be making the trip to Denmark for refurbishing!

I'm glad everything arrived safe and sound - thank you, and feedback returned! :)

- - - Updated - - -

everblue's boards were shipped back also

WuueeR
9th November 2015, 17:49
Sending PM

xeon3d
13th November 2015, 09:34
How much to recap a4k board, Cpu card, swap ram thingies and clean battery gunk?

tbtorro
14th November 2015, 22:49
How much to recap a4k board, Cpu card, swap ram thingies and clean battery gunk?

Offer sent via PM.

Harkonnen75
15th November 2015, 14:18
Hello,
I need your help with the Amiga 4000 motherboard defective....
I sent a private.

udihow
17th November 2015, 21:19
Hi, I have an A4000 in bad shape and I'm interested in...

- A4000 4000T capacitor replacement service
- A4000 battery area check, battery removal and cleanup
- Track repairs IF the damage is clearly due to damaged tracks/lifted pads.

and maybe even more.. want to know if its possible, how it works and what it would cost.

tbtorro
19th November 2015, 19:20
Work agreed with udihow - payment received. Work added to the queue.

everblue
20th November 2015, 11:46
Received and all is good! Awesome thanks!

k0x
23rd November 2015, 04:52
Package sent.
Money sent.

tbtorro
23rd November 2015, 12:18
Package sent.
Money sent.

Payment received. Work added to the queue.

tbtorro
25th November 2015, 13:45
udihow's boards are received, starting work this weekend

Marco06
25th November 2015, 19:38
Oh, i have unreaded this thread ! :unsure:

I have more hardware to check, this is one part in picture:


98012

tbtorro
26th November 2015, 23:49
spaceman's boards has been shipped back today

spaceman
28th November 2015, 02:18
Great! Looking forward to getting all this back! Thanks for all the help and the extra work!

tbtorro
29th November 2015, 19:12
Work started on udihow's boards

tbtorro
30th November 2015, 08:58
Update on udihow's A4000 and A3640, the usual suspects, several capacitors have leaked both on the motherboard and on the A3640.

On the last picture the 2 capacitors are from the A3640, notice that the capacitor on the left has NOT leaked yet (as opposed to the one on the right). This is because the other one is mounted wrong during manufacturing (3 capacitors on A3640 are know to have been mounted reverse) and it caused it to age much faster.

Anyway, no damage to the tracks yet, so all this mess can be cleaned up reliably.

supaduper
30th November 2015, 13:37
I visit Tbtorro`s repair thread often and love the great repair work and of course the pron pics :)

tbtorro
1st December 2015, 10:21
I visit Tbtorro`s repair thread often and love the great repair work and of course the pron pics :)

Thanks for the kind words! I'm hoping that people can learn from the examples presented here.

tbtorro
2nd December 2015, 11:05
udihow's boards are complete and have been shipped back.

tbtorro
5th December 2015, 00:31
Boards received from k0x

tbtorro
6th December 2015, 14:50
Work started on k0x's boards.

tbtorro
6th December 2015, 20:59
Some updates on k0x's boards:

As usual some recap job didn't go very well on the A4000T modules, my best guess is that there was a lifted pad that someone tried to repair with a through hole (wrong) type capacitor, with little success as one of the legs are still in the air.. The other capacitor is just badly soldered, hopefully no lifted pads under the solder blobs. Some other leaked caps spotted on the AV module also:

98492 98503 98504

On the A4000D motherboard it's the usual, leaked caps on the audio circuit, some gunk have already covered the amplifier chip also. On the upside the battery area is very nice and clean, absolutely no leak, and if I had to choose between a leaked battery or audio area I would definitely chose the later. So all in all good call:

98515 98516 98517 98518

On the CPU cards it's same old same old, all the incorrectly mounted caps have leaked:

98519 98520 98521

tbtorro
6th December 2015, 21:00
And last (but most importantly) a 12V power line has disintegrated on the underside of both A4000T motherboards. This is a PCB track that goes directly from the +12V pin of the PSU connector to pin 28 of the A/V module connector. I have never seen anything like this before. Also there is no audio out even if the burned track is connected again (haven't done in-depth diagnosis yet). It's seen on 2 (!) boards, exact same track burned. If anyone has any idea what might have caused this please let me know. Right now it's a mystery. RGB video out is OK.

98522 98523 98524

stachu100
6th December 2015, 22:36
"
If anyone has any idea what might have caused this please let me know.
"
I've seen two mobos with tracks burned with no visible reason. After closer look I've found mechanically cracked ceramic capacitors (between 5V and GND) causing short circuit. Other case was short circuit between +5V and GND planes inside 4 layers PCB on turbo board. This created a burned hole in PCB...

k0x
7th December 2015, 10:56
In theory - could the track be burned with short in zorro slot (malfunction card)?

Or another theory - shorted audio cinches?

tbtorro
7th December 2015, 13:32
In theory - could the track be burned with short in zorro slot (malfunction card)?

Or another theory - shorted audio cinches?

I think it's unlikely as that power track has nothing to do with the zorro bus. It leads directly from +12 to the AV module.

Juzz
15th December 2015, 15:52
I am interested in work on an A4000 board and have PM'ed with tbtorro about it and no sense in shipping the board to and from since we practically live next to each other.

(Registering here so I can leave feedback after the work is done).

tbtorro
20th December 2015, 20:51
Work agreed with Juzz - payment received.

10Thumbs
24th December 2015, 20:55
Hi tbtorro, I have some work for you on an A4000D mobo, an A600 mobo and an A3640 cpu card if you have time in the new year?
I'll pm the details to you

tbtorro
2nd January 2016, 14:40
RuneRider's boards have been received today, added to the queue.

DesktopDynamite
13th January 2016, 01:21
Declaring interest for recap/timing fix for 2 X A1200, and an A600. Thanks.

DesktopDynamite
21st January 2016, 09:31
Pm sent, shipped my A1200 mobo rev 1D.1 today, payment sent too.
Thanks.

tbtorro
22nd January 2016, 13:14
Pm sent, shipped my A1200 mobo rev 1D.1 today, payment sent too.
Thanks.

Payment received.

tbtorro
24th January 2016, 22:22
An update on k0x's boards, some really bad capacitor leaks spotted, this is the perfect example why recapping (in time) is absolute must:

100485 100486 100487 100488

tbtorro
5th February 2016, 09:38
RuneRider's boards has been shipped back

- - - Updated - - -

Some more problems spotted on one of k0x's A3640 boards. Under microscope I've found several pins of the expansion bus connector had dry joints. I'll try to reflow them this weekend and see if it will fix the booting problems with this card:

100958 100959

tbtorro
6th February 2016, 22:00
Just a quick update on k0x's boards, one of the A4000T AV module has suffered from a bad recap job, and also there was no audio. I was really worried what I might find (or not find) under the goo, but luckily all the solder pads were present and there was no serious corrosion.

After cleanup, a quick check on the schematics shown that the burned cap job was indeed one of the filter capacitors on the amplifier output. There is two of these (one for each side) and I often see these leak (also on A4000D). If these caps die, or corrode the tracks, then it will be an open circuit, and there will be no audio out as they are right before the RCA output. Anyway, after new caps the audio is nice and clear both sides.

Before:
101184

After cleanup:
101185

New caps:
101186

Miru
8th February 2016, 18:55
Hi tbtorro,

What is in your opinion the benefit of replacing the electrolytic caps with ceramic caps (same specs of course), the elkos will likely leak again in some time, not ?

tbtorro
8th February 2016, 20:14
Hi tbtorro,

What is in your opinion the benefit of replacing the electrolytic caps with ceramic caps (same specs of course), the elkos will likely leak again in some time, not ?

I don't think this should be discussed on this thread. There is a discussion here: Link (http://www.amibay.com/showthread.php?68635) and I agree with Bryce.

In short, maybe the most optimal solution would be to use a mixture of them. And actually whether or not they'll leak depends on many factors like usage, storage conditions etc.

tbtorro
8th February 2016, 23:36
Quick post on track repair on k0x A4000T fried 12V line:

101379 101380

warr8or29
11th February 2016, 22:37
Hi
congrats for your excellent work on our beloved machines
i've a 4000 mobo which needs a good recap , i'm sending you a PM with photos.

thx

tbtorro
13th February 2016, 03:36
k0x's boards are complete, shipping back on Monday.

One of the A4000T motherboards developed a boot problem. Took me a long time to figure out that BOTH Paula and odd CIA U550 was faulty. Never seen this before, and my only theory is that something was connected to the serial port that both fried the 12V line and affected Paula. The CIA problem could be unrelated as they are known to fail from time to time.

So I had black screen to start with, when I've noticed that U550 is slightly more hot than U560. My guess would be around 50-60C, I could keep my finger on it for several seconds. Pin 2 of the CIA's should go from high to low after about 1 second at power on - an indication of CPU activity - and there was only around a 300mV signal change (instead of 5V). So probably the signal was coming in, but the chip would not process it. Also _KBDAT (pin 43) output was stuck low at power on. For reference, the A4000T will not boot without odd CIA U550, but you will get a flash of gray screen indicating CPU test passed.

After replacing U550 I had gray screen, and power LED would change brightness at power on, indicating passing CPU tests. But still no KS screen. The system would react to CTRL+CTRL+A, and since keyboard.device is loaded relatively late in the boot sequence, my next guess was Paula holding the system from booting. One way to check Paula is by the temperature, but also by measuring out DMAL (pin 12) for a strobe of high pulses. This signal was just flat with no activity at all.

Before removal of Paula, to be sure that no other signal faults affecting the chip, I've measured out all the incoming signals (clocks, reset, interrupts, power) and they were all there. So new Paula was installed, after which the system came to life and all is functioning fully.

I would like to say thanks to Anthony Hoffman and Chucky from EAB forums for providing invaluable tips and advice during diagnosis! :-) Btw. I did this fix for free apart from the cost of the chips.

Removal and installation of new Paula:

101614 101615

tbtorro
13th February 2016, 11:10
Work started on Wally's board

tbtorro
14th February 2016, 23:04
Wally's board is complete. Full recap and timing fix. Will be shipped in the next couple of days.

This was one of the better looking A1200 boards, very clean, only a single capacitor had a mild leak, but no corrosion, only some acid on the affected area, which was cleaned up. I wish I would see more boards like this recapped in time with no damage done, but sadly it's not the case.

Before and after cleaning up the leak:

101725 101726

Audio area nice and clean, before and after the recap:

101727 101728 101729

And my test setup - just for fun:

101730

warr8or29
15th February 2016, 07:18
Hi

payment sent for the A4K recapping & upgrading operations
i will be shipping tomorrow or wednesday

congrats on your work!

MannaTheBerserk
15th February 2016, 21:01
Hi,

Do you know if Amiga 500s need recapping as well? If yes, can you do that?

DesktopDynamite
15th February 2016, 21:44
Others report that A500 don't need recapping since the capacitors used are already of high quality...

Sent from my GT-I9301I using Tapatalk

tbtorro
15th February 2016, 23:10
Wally's and k0x's board was shipped back today.

- - - Updated - - -


Others report that A500 don't need recapping since the capacitors used are already of high quality...

Sent from my GT-I9301I using Tapatalk

I don't think it's about quality. The A500 uses a different type of radial capacitor that is much less prone to leaking, and it's actually possible to see when they fail because the top bulges (the electrolyte produces gases when the part fails, and the escaping gas breaks the vent on the top). My theory is that this failure behavior prevents the acid leaking out as opposed to the SMD type of capacitors that don't have vents, so when the gases escape the only way out is at the bottom seal, after which liquid electrolyte flows out.

So in short better to replace those types when they actually fail.

RuneRider
16th February 2016, 01:26
Got my A4000 boards back and they're re-installed. Great work!

MannaTheBerserk
16th February 2016, 11:56
Thank you guys for all the answers! :)

LoopHead
19th February 2016, 09:22
interested, pending a few questions.

ttcaven
19th February 2016, 15:59
Declaring interest for A4k motherboard+CPUboard cap work and possibly the price of an A600 resurrection. :)

tbtorro
24th February 2016, 03:35
Boards received from warr8or29

DesktopDynamite
24th February 2016, 03:45
Mobo received back, tomorrow will try it...can't wait :D

Sent from my GT-I9301I using Tapatalk

warr8or29
25th February 2016, 08:42
Boards received from warr8or29


Hi

hope they came to you without harm !
i packed them very strongly.

btw, if you're still looking for a MMcd from elbox, i have one , i can send it to you for free.

DesktopDynamite
25th February 2016, 11:57
My A1200 rev 1D.1 mobo back safe and sound , fire it up and worked like a charm! Thanks a lot tbtorro :D, and another miggy saved = happy ending!

Watch the video here: https://www.facebook.com/Wally1982/videos/10205276186575725/

crazyegg
25th February 2016, 14:13
Hi can u send me info for recapping for
4000t
A4000 and cpu card
A600

Thx. Ed


Sent from my SM-N910W8 using Tapatalk

Bitboy
26th February 2016, 23:13
I have a non-working A4000 in a Mediator tower and the caps for it, but I am not qualified to do the work and just saw you offered repairs, which I think my dear A4000 needs badly. It used to boot but was unstable, now it just doesn't start anymore.

Can you help with this? Thanks!

Bitboy
27th February 2016, 23:26
I'm sorry for posting a bag of hot air, but I needed 2 posts to send a PM to TBTorro. So consider a PM sent to you after this post. Thanks! :)

tbtorro
28th February 2016, 15:54
Work received from LoopHead

Whisper
29th February 2016, 11:27
Interested in the A1200 recapping service for my mobo. Sending PM

tbtorro
1st March 2016, 15:38
Work started on warr8or29's A4000D