Amiga 500, green screen
Testing
- Looked for any damage traces, two found near the expansion bus
- These were fixed using some wire
- Using diagrom, performed a memory test
- Revealed a bad RAM module
Resolution
- Replaced the bad RAM module
Amiga 2000, co-processor slot not working
Testing
- Verified _BR and _BG were low
- System would boot with the A2630 when in B2000 mode with CPU removed.
- System would not boot DiagROM.
Resolution
There is a via directly under the CPU socket, two actually that tend to get damaged due to corrosion. Well, one of the two were broken. This was _BG which goes to Buster to tell it to allow the CPU card to process.
Adding a jumper wire resolved the issue. Confirmed card was properly working via SysInfo.
Lesson
Always check these two vias, I try to every board I work on for this exact reason.