Hello everyone!
Like 3 or 4 years ago I got my hands on a batch of non-working NTSC Amiga 500s with varying degrees of damage (missing keyboard / floppy, did not turn on, scratched / broken case, etc.)
So... instead of trying to diagnose the problem of each one, I cleaned them all and replaced all electrolytic capacitors and all chip sockets. I also removed any obvious modification made to them (jumpers, memory chips, broken / cut motherboard traces / solder blobs)
Long story short... they all work!

Now I have 5 extra motherboards (2 Rev. 5 / OCS Agnus / 1.2 Kickstart, 3 Rev. 6A / ECS Agnus / 1.3 Kickstart) and I don't have use or space for them so they are for sale.
Ping me if you are interested. I can take photos and/or videos of them. Let me know if you want a Rev 5 1.2 or a Rev 6A 1.3
Thanks!
Efrén