I recently bought an NTSC Amiga 500 with a version 6 motherboard, that won't boot up. It shows a green screen on the TV, and the Power light blinks 10 times short, 1 time long, then repeats. The caps lock light can be toggled 11 or 12 times then stops being toggleable.
Except for the Denise and CPU, I pulled every chip carefully with chip pullers, cleaned the chip legs and socket, and reseated them, and I went over the Denise and CPU legs with a generous amount of alcohol as well, but there was no change. I let the A500 run for about an hour, the Fat Agnus was warm but not hot, and the RAM chips were cool.
I also visually inspected the board and saw no cold joints, scraped traces, burned-out components, or bad capacitors. The previous owner was the original owner and only opened it once just out of curiosity, but never did anything on the inside.
I've been doing all this without any trapdoor RAM installed by the way.
It looks like I've done all there is to do when the A500 is acting like this. But if any of you guys have suggestions about other things to try, I'm all ears.
