First post, by megatron-uk
Attempting to resurrect a PC-Chips M321 (rev 2.7) board that I picked up for cheap.
Won't power on - POST diagnostic card shows no +12v line...
These boards have some absolutely appallingly cheap electrolytic caps, including between the AT PSU header and the main power traces, so whilst removing components to clean the compulsory battery damage, I'm also replacing those caps:
I also desolderd the BIOS ROM (non socketed) and the keyboard controller (which *is* socketed!), since I'll be cleaning the entire area (already neutralised with vinegar and rinsed with IPA after getting the board) and removing all of the visible corrosion (which, admitedbly, isn't a lot with this example) before re-assembly.
All of the caps on the board seem to be those horrid little yellow 'BH' (or HB) 10uF 25v things. I'll replace them all.