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

[Framiga]

take a look here for tech info about RTC repairs. (link "repair section" on bottom page)

[Framiga]

@da9000

if this is your mobo you are in a big trouble! :-(

a really weird chemical reaction! and anyway (for future repairs) a good isopropyl alcohol, doesn't needs all the time you spent to dry it out. Sorry but i can't see any good solution (at least looking at the pic)
 

[Framiga]

try to clean as much as possible. With that pic is almost impossible to see anything. Even the solders joint "seems" knackered (or badly reworked)

All the best :-)

[Framiga]

sorry but a "The one I used was typical super-market stuff: 70% isopropyl." is out of the game for cleaning electronic stuf!

=>99% is the right number! :-)

[Framiga]

"Couldn't find any How is it going to be different?"

a 30% of "only Jesus knows" remaining stuff!

Anyway... i can provide a RS-Components RoHS IPA 400ml can code ID

cod: 693-775

but not knowing where you are from, i don't know if it could help.

[Framiga]

the problem now is not the quality of the alcohol anymore.

Now you have to find anf fix the damaged parts. Look at the damaged zone with a magnifier lens (or what you prefer)

I would suggest you to reflow the solders also (obviously if you have the right tools)

PS- for the "next" cleaning work: some Isopropyl alcohol flavour in USA

[Framiga]

look carefully to VIAs also (perform a continuity check from the bottom side of the VIAs to the top one).

IMHO is theres a damage, is on the PCB itself.

Good luck :-)