Tims Retro Corner | Amiga 500 Plus Repair - Take 2 @TimsRetroCorner | Uploaded November 2022 | Updated October 2024, 2 hours ago.
This Amiga does't boot: it just has a black screen and a flashing drive light. Check out pcbway.com for great PCBs, 3D printing and other services from just $5.
From the initial look I suspected the 2MB Agnus was dead ( a very expensive IC), but maybe there are problems with the RAM support logic? and there's always the old standby... battery damage.
Also viewers suggested checking out this video youtube.com/watch?v=V3yC2DFsNlc&t=1698s for what looks to be a similar problem. So let's do that.

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Music: Arpanauts by Eric Skiff - ericskiff.com/music

Chapters
00:00 - Introduction
02:52 - Sponsor Message
03:40 - First Test
06:32 - Scope it Out
10:17 - Desoldering Montage
13:30 - Chips tested
15:18 - Beeping the PCB
16:34 - Green Goo
20:02 - Bodge Wire
20:58 - New Chip, Crystal
22:39 - After all that… Does it work?
23:48 - Vanilla A500 Comparison
25:22 - Clean the PLCC Socket
26:56 - A New Agnus
29:05 - Trying the New Agnus
30:45 - Another Desoldering Montage. Oh joy!
34:53 - Epilogue