Amiga a600 purple/pink screen issue

[Groooover]

Hi, well after owning an a600 for a whole day it's just suddenly started showing a purple/pink tint on every screen. It doesn't matter which game, it even has it on the main kickstart screen, I know that's purple too but its more of a pinky tint to the whole screen. Does this mean it's dying or is this a known issue that can be fixed easily, please someone help!

 

[AmiNeo]

This could possibly be a capacitor issue if theyre starting to give up. It's not an issue I've come across before though. It's normally the sound which is affected first, which will start sounding crackly like an old vynl effect, but its not always the case...

I'm sure someone will be along soon with a bit more info than I have

Obvious things to try in the mean time is making sure all connections are nice and tight both ends etc if you havent already.

 

[Groooover]

Yeah neither am I, I think it may have overheated because it feels warm underneath so I'm just trying to leave it off for a while and see what happens. I'm guessing if it works after a cool down then it will probably be the caps.

 

[tokyoracer]

I had this exact same issue one time. In the end I just replaced the motherboard since this was back before helpful amiBay existed and literally nobody could be bothered to help me on this 'other' forum.

You might be right about heat issues though, I did remember the 600 was warmer then I'd have expected it to be. Best of luck fixing this.

 

[mjnurney]

My 600 gets pretty warm and it works fine. Are the caps leaking? - look at the solder pads next to the silver capacitors ...are the pads dull?

 

[Zetr0]

Its wise to point out we need to do some tests first before we blame the A600.

1. what video output source are you using?

RF, Composite or RGB Scart?

2. Have you tried another output source?

3. Have you tried another monitor?

---------------------------------------

If the answers are yes to all these questions, then we can continue

1. Possibly the video feed capacitors VIO and VOUT are failing - is on its way out - I would say replace

C459 ( 0.22UF ) capacitor.
C460 ( 10UF ) capacitor.
C408 ( 1,000UF ) capacitor.
C409 (100UF) capacitor.

ensure that you get the same voltage values or slightly higher - thats to say you can replace a 16v with 25 volt and it would be fine.

2. Final 4bit of each RGB component is produced by U31 and U32 respectively, both of these IC's are 74HCT244, both are also SMD, you can get these from various places for very little pennies, I may even have some spare, but to replace them you will need to use hot-air (or have ninja soldering Iron skills)

I seriously doubt that either of the logic IC's have developed fault, I suspect a video power feed in all honestly

Anyway, that would be my suggestion, I do hope that lot helps

 

[Groooover]

Thanks everyone, well it definitely isn't a feed issue. I've tried it on both composite and RF on different. Sources and its the same. I did notice one of the caps was protruding slightly so I'm guessing its a caps issue. Would it be cheaper to replace the board?

 

[rkauer]

Nope, replace the capacitors. Do it yourself or find a TV repair shop nearby.

A capacitor set for the A600 will cost you less than £10 (postage included), you can check on this very site the prices of a replacement A600 board.

 

[Groooover]

Thanks rkauer, any ideas where I can get the cap sets from?

---------- Post added at 08:09 ---------- Previous post was at 07:43 ----------

hmmmm they are a bit but i just put that down to dust/dirt

My 600 gets pretty warm and it works fine. Are the caps leaking? - look at the solder pads next to the silver capacitors ...are the pads dull?

 

[mjnurney]

if you can take a decent photo of the board (close up) we can tell (ish) if its the caps but it will be easier for you to see as you have the board in front of you.

look at the solder pads on other components - shiny and silver i expect but the pads on the caps or all of the caps will be dull and possibly in that local area too. its where the capacitor has leaked on the board.
i replaced all the caps on my A600 a few weeks ago and it works beautifully now. its not hard but the right tools and patience are needed.

mike.

 

[Groooover]

thanks mike, do you have any idea where i can get the caps from and some directions as to which ones i need? I'm looking everywhere but getting no where fast. I really don't want to get another motherboard as i think i've spent enough on it as it is for it to do this within a day, but i guess that's the price you pay for buying old hardware. If anyone can point me in the direction of how to replace these caps and which ones i need it would be much appreciated as this has put a bit of a downer on my amiga experience

 

[drbrain]

I'm sure you can find the caps you need here....

https://www.amibay.com/showthread.php?t=4400&highlight=caps

 

[mjnurney]

As the above link says , ask Cosmos or check ebay but with Ebay you'll be buying in packs of ten or so usually.

what rev board is it?

 

[hayesey]

Well, I'm really quite embarrassed that this has happened one day after me selling the Amiga! It never showed any signs of failure when I had it, although it's been sat for maybe two months since I used it. It was left in a dry place covered up from dust though.

I read your PM before this and I see you've already tried a different TV and both composite & RF connections.

All I can suggest is that if you get hold of a set of capacitors and leave the Amiga with me for a couple of days, I will replace them for you as I have access to decent de-soldering & soldering equipment at work. You'll need to buy the capacitors but there are people on here selling kits for not a lot of money. I'll not charge anything for the replacement as a gesture of good will since you've only just got the thing. Obviously I can't guarantee it will fix the problem though!

 

[Groooover]

I'm sure you can find the caps you need here....

https://www.amibay.com/showthread.php?t=4400&highlight=caps

thanks drbrain that looks perfect!

---------- Post added at 09:25 ---------- Previous post was at 09:24 ----------

As the above link says , ask Cosmos or check ebay but with Ebay you'll be buying in packs of ten or so usually.

what rev board is it?

I'm not sure to be honest mike as im at work at the moment but i'll check when i get in. thanks

 

[Groooover]

It's 1.5, hayesey is going to get the caps from Cosmos and i'm going to attempt to fit it. It's all experience! Does anyone know if a standard floppy cable will work on the 600? I noticed the cable was a little worn so i'd like to replace it.

 

[AmiNeo]

I'm not 100% but I'm pretty sure its the same interface so you should get away with it. The only differences I'm aware are in the drive itself.

Can anyone confirm for me?

 

[Groooover]

Cool, cheers AmiNeo. I'll give it a shot, it can only not work!!

I'm not 100% but I'm pretty sure its the same interface so you should get away with it. The only differences I'm aware are in the drive itself.

Can anyone confirm for me?

 

[AmiNeo]

Cool, cheers AmiNeo. I'll give it a shot, it can only not work!!

I'm not 100% but I'm pretty sure its the same interface so you should get away with it. The only differences I'm aware are in the drive itself.

Can anyone confirm for me?

Indeed!

 

[BLTCON0]

@Groooover
Just in case by 'standard' you mean 'PC standard' - make sure there's no twisting in the cable. Just like your existing cable. Other than that yes, it's the very same 34-wire flat cable.
Steal one from another A500/A600/A1200 or make one yourself or cut the untwisted part off a PC floppy cable, all should work.
But if the PVC is only mildly worn and no wire is exposed, I see no reason to swap the cable if it works fine.