Amiga 4000 issues

[Tandrews-ny]

I am working on an Amiga 4000 that is having some odd issues.

Booting DiagROM produces serial data, but it has corruption. The corruption is always the same.

I am also having video issues. When using DR 1.2 I get solid colors, no bitmap.

I've gone over the entire board and theres no damage I haven't fixed. Removed all the chips (besides the GALs). No damage under them. No damaged vias.

Reflowed Alice, Lisa and Paula. Attached putty output.

[DigitalKeeper]

Please make Photos of the Battery Area

And a Photo of the Screen with the Diagnostic Color from Diagrom....

Serial-Output -> Plz check the Area by C317 & C318, coz of leaking; the attached components (i.e. ceramic condesator's) are oft effekted by the fluid.

Have a look:


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And the Battery Area - look's Good - but it isn't Good:


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After Restoration - all seem's to be fine - take care about the 3 Traces UNDER the PS2-Simm-Socket:


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.

[Tandrews-ny]

I can definitely look into those caps as there was some damage due to a leaky cap. I've fixed the traces over there too.

The battery area I've removed almost every part and the SIMMs. No damage under any of the SIMMs outside some useless vias like LEDs and I'll fix those later.

To be clear, it's not a single color, it changes as DiagROM does stuff.

Originally Posted by DigitalKeeper

Please make Photos of the Battery Area

And a Photo of the Screen with the Diagnostic Color from Diagrom....

Serial-Output -> Plz check the Area by C317 & C318, coz of leaking; the attached components (i.e. ceramic condesator's) are oft effekted by the fluid.

Have a look:


-----

And the Battery Area - look's Good - but it isn't Good:


-----

After Restoration - all seem's to be fine - take care about the 3 Traces UNDER the PS2-Simm-Socket:


-----


.

[Tandrews-ny]

https://photos.app.goo.gl/BFNJKohMq92gzMGG8

Note I've been working with Tristan, John and a few other people who are Amiga elite. So I have no gone this alone.

My good friend Acill / Paul has a 4000 replica board...thinking for the time i've invested, I may just move to a new board. I'm already building a 3000.