A500 Plus died (prob tracks) Pics. Please help

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dougal

dougal

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It was working fine but now its just crashing all the time randomly. Usually it gives a software error (guru) or else just a white screen.

I've removed the 1MB expansion, changed the CIA's and the ROM and re-seated the Agnus. Nothing seems to work.

I has had battery corrosion in the past, but the battery was removed and board cleaned and it never gave me any issues.

The PSU is good.

EDIT: Now its completely dead. It was fine before probably because i did not stress it. Once i added the 1MB expansion it slowly got worse over about 1 hour. I think using the extra ram is what finished off what was left of the damaged tracks.

The ram expansion is fine because it showed 2MB chip ram prior to dying. And i've now put the expansion in another A500 plus which is working flawlessly.


---------- Post added at 17:43 ---------- Previous post was at 17:39 ----------

Obviously because I decided to record a video of the problem and post it it is now working fine.

---------- Post added at 18:13 ---------- Previous post was at 17:43 ----------
aqehu2uq.jpg


---------- Post added at 18:47 ---------- Previous post was at 18:13 ----------

I'm thinking the problem must be the damaged tracks rotted some more. Now it won't even boot.

---------- Post added at 18:52 ---------- Previous post was at 18:47 ----------

3ytybeja.jpg
 
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It could very well be some of those tracks that have gone. They do look quite bad. What I would do is reseat all ICs in sockets (lift them a bit, then down again). If no change, then measure all tracks in the damaged area one by one to find out if one has gone. A bit of flexing or heat up in the PCB can be enough to break one completely if it was on the edge.
 
demolition said:
It could very well be some of those tracks that have gone. They do look quite bad. What I would do is reseat all ICs in sockets (lift them a bit, then down again). If no change, then measure all tracks in the damaged area one by one to find out if one has gone. A bit of flexing or heat up in the PCB can be enough to break one completely if it was on the edge.
Click to expand...

I've tried re-seating the socketed IC's
Replaced both CIA's with others
Replaced the ROM with another
Re-seated the Agnus
Removed the Indivision ECS and just put the Denise (Properly)
Removed trapdoor expansion

I've tried using a multimeter and seems that from point to point only one of the 4 points near the words "battery" seems to work and the rest are appear dead. I imagine that those points lead to the resistors above them (below Garry).

I'll try and fix the damaged tracks but I have a feeling that this is going to be more hassle than its worth but still worth a shot.

---------- Post added at 19:56 ---------- Previous post was at 19:35 ----------

I don't think i'll be able to fix this myself

---------- Post added at 20:15 ---------- Previous post was at 19:56 ----------

EDIT: Now its completely dead. It was fine before probably because i did not stress it. Once i added the 1MB expansion it slowly got worse over about 1 hour. I think using the extra ram is what finished off what was left of the damaged tracks.

The ram expansion is fine because it showed 2MB chip ram prior to dying. And i've now put the expansion in another A500 plus which is working flawlessly.
 
if you cant do it yourself dont bother.

explaining how to wont fix it when it comes to broken traces, you need a certain amount of skill in first place.
 
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I had fixed a plus a few years ago by bridging the one damaged trace. Same with an A500, one trace.

But on this i'm guess at least 3 are damaged. I may try and get someone to fix it for me or else remove all the socketed chips and dump the board. But seriously i will try and get it fixed first.
 
it might not just be traces,it might also be failed logic or even sockets.

check the sockets for corrosion gary next to the leakage and check the pins on and under 74 logic if you can and under gary, the corrosion can go quite far and damage logic around it.

in this case a picture might not help but since you have a working one for comparison check all the traces for breaks first and the sockets,after that you might be replacing 74 logic.and/or custom chips.

but i have to say it is rewarding to fix one.
 
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