So yeah, the SNB-022 is pretty much fixed now, I just need to get some power source for the RTC (super capacitor, battery, whatever ...), swap the fake cache chips and maybe find some transistor to lower the voltage and install faster CPUs. The socket looks horrible, but heh it works, and it's way too much work to do, and that's only for aesthetics as you can't see much of the burn if the CPU is installed.
Moving on back to the Abit FU3 (386DX motherboard with two missing simms slot).
The other day I removed the two corroded chips near the battery slot, and I also removed the keyboard controller's socket to treat the corrosion.
The discoloration is just the flux that reacted with the corrosion (there's no discoloration on the KBC part for example). Sadly, I have damaged some vias (corroded solder joints are hard to remove ...), but they still make contact ...
As you may see, there's also a broken resistor over the 7407 spot, but hey it still works and it's none of my concerns for now 😁
So I checked for continuity and they all traces still work. So I cleaned all this mess some more and put new sockets and I reinserted the chips in there.
Then I tested the board and ... nothing has changed.
So I guess the corrosion didn't create that issue (although it was probably going to make things even worse !)
The POST code do this : 02->06->13, then it stops changing for a while, and then it falls to 00.
Also, I plugged a PC-Speaker in there, and it makes three long beeps with long pauses, then it stops and then it does this again, then stops ... forever.
I guess this is RAM issue. Just to make sure, I installed cache and made sure everything was properly configured, it didn't change, then I sprayed some contact cleaner in the RAM sockets, but it that doesn't work, I think I'm going to remove all the SIMM slots and put some other slots I will salvage from another motherboard.
I wonder if some of the traces of the SIMM slots aren't just common to all of them, and *maybe* the last slots are where the traces are supposed to go to the chipset. And looking how poor the desoldering job was made there, this is highly possible that some traces are broken. So perhaps replacing all the simm slots and making sure that all the traces are working will fix the board ?