Amiga motherboard (A3000) cleanup with Isopropyl alcohol: weird results

[amiga_3k]

About photos: They seem to take a few hours to get actually available. When they are, you can add them to this thread. If you don't have the patience, put the pictures somewhere on the net and link them using the little button sitting just left of the bigger buttoen 'picture manager'.

About the residu: I had a mate writing my chemistry reports bacause I didn't understand it back then. Nothing much has changed ever since tho ;-). My humble advice would be to brush the residu of the board gently.

What you should be looking at is vanished traces in the PCB. The accid from the battery first eats its way thru the protective paint of the PCB and when that's gone the copper traces become victim. You might need to repair traces to solve the problems! This sounds like a hell of a job (and it is) but it could be done even with thin, insulated wires.

[amiga_3k]

Now here's just an idea...

You've de-soldered the chip-RAM and replaced it by sockets and socketed versions of the RAM. Now, if you've poured the alcohol (any good drugstore (that's the kind where you can get medicals, right?) should be able to deliver near 100% alcohol) on the component side of the mainboard then normally it should not escape at the underside of it. If it does, there's some leakage - indicating possibly defective soldering. So... I'd say de-solder the chip-RAM sockets, clean the soldering holes to make sure they're free from acid and corrosion. Then solder the sockets back in place, making sure the soldering is 100% okay AND 'rest' on the PCB. That last part is important because while pressing in the Chip-RAM you don't want to add forces to the solder-joints.