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.