A1200 no picture...

I've successfully achieved it on an A600 twice with no change whatsoever to its condition. And look at it this way, if Im capable of doing it theres one more person out there capable and willing to restore these things. I'm not one to sit on my butt and pay other people to do the work if I can help it, and technology is a huge passion for me. I've learned something which can prolong a loved machine and help a community and that is priceless.

Everything is fine my friend. I'm not a total noob, just didn't have the right tools the first time... I wouldnt do it if I thought I would damage them and as per your initial advice, I've now had plenty of practice. I'm no Zetr0 but I'm perfectly capable of replacing caps now.

Do not worry, I care as much as you do. :) :thumbsup:

silly suggestion but thought throw it in anyway,have you tried connecting to a hifi then inserting a disk,then powering it on to notice would it boot and least produce a sound from a game regardless of display problem?.

well its been connected to a tv and powered speakers and left on for a full 3 minutes when i was initially testing, and nothing came out of either one speakers. Theres also definately no activity from the floppy either so i doubt it'd have loaded a game (i did try with a disk in as part of the floppy test and all you get it the initial click when the power hits the drive and then nothing).


I received caps from cosmos today. The 22uF caps on the board read (22, 25s, 29t) could anyone confirm this is standard for the revision 2B board as the 22uF caps cosmos sent read (22, 16s, 405) and i cant find any clear enough pics of a 1200 board online.

Thanks

Fear not amiga hardware has the pic-
site- http://amiga.resource.cx/mod/a1200.html

High res pic*click on "medium" pic link in the pic to shrink it*- http://amiga.resource.cx/photos/phot...res=hi&lang=en

hmm those ones are showing different 22uF caps again, at 36v. I know higher Voltage capacity is better for capacitors up to a certain extent but i need to know if the 1200 board is safe with 16v 22uF caps... :unsure:

probably no use to you but found some info here,the same site has schematics to download,all these apply to the ones made by commodore.


link with info and downloads- http://www.amiga-hardware.com/showha....cgi?HARDID=13

Quote:

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Rev 2B (Both budgie Rev -01 and Rev-02 were used. Resistor 118 was changed from 470Ohm to 220Ohm)

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hmm, doesnt help much im afraid, im doing a capacitor replacement and the capacitor kit i have bought from Cosmos appear to have a lower Voltage rating on the 22uF capacitors (16v as oppossed to 25v and 36v) than ive seen on other boards). I really just need to know if theyre safe to use...

@AmiNeo,

As a point of interest the Audio circuit only needs a 24v swing so 15volts (top and bottom is 30volts capacity) which should be fine (as you have -12v and +12v (total 24v swing)

Commodore had a terrible habbit of buying cheap batches of components "that will do" some overated and some (imho) underated.

On my 2B motherboard there are 2 different voltages 15v on the video feed, and 22v on the Audio - as I ran out of 15v 22uF's I had to use 2x 15v's in the Audio circuit - and these are working fine.

Had it running Project X demo (as I like the tune) and it visually tests the video with transitions and screen formats.

However if you have any problems, have a chat with Cosmo's I am sure he can help you out.

All is fine, cosmos got back to me with an explaination. Thanks for the input jack :)

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