Good morning! (8 AM over here)
I tried every combination of RAM, RAM sockets etc. that made any sense and also swapped the RAM with known-good modules from a working SE/30. No success.
Wally:
Sadly, only the CPU is socketed (and the video rom etc. of course). I already thoroughly cleaned all contacts when I washed the board.
It seems that there has been minor leakage from various caps (including C7, C8, C9, C10). You can tell by looking at the solder points surrounding the caps, they appear slightly dull. However, there is no serious corrosion and it doesn't look nearly as bad as some other logic boards I was able to bring back to life by washing/recapping them.
R24 has 75 Ohms, continuity to UI6 Pin 18 and J12 Pin 10 is there. The decoupling chokes are all fine
Do you have an opinion on this specific problem possibly being caused by the old caps? Every mac with bad logic board caps I've seen before at least displayed anything (horizontal/vertical bars, sad mac, etc.) and didn't chime or had the sad chime, so I'm afraid that swapping caps will not resolve the problem here.
If there's no other option, I'll see if I still have enough caps in stock to fully recap the board. Maybe it will magically come back to life...
Thanks a lot
I tried every combination of RAM, RAM sockets etc. that made any sense and also swapped the RAM with known-good modules from a working SE/30. No success.
Wally:
Sadly, only the CPU is socketed (and the video rom etc. of course). I already thoroughly cleaned all contacts when I washed the board.
It seems that there has been minor leakage from various caps (including C7, C8, C9, C10). You can tell by looking at the solder points surrounding the caps, they appear slightly dull. However, there is no serious corrosion and it doesn't look nearly as bad as some other logic boards I was able to bring back to life by washing/recapping them.
R24 has 75 Ohms, continuity to UI6 Pin 18 and J12 Pin 10 is there. The decoupling chokes are all fine
Do you have an opinion on this specific problem possibly being caused by the old caps? Every mac with bad logic board caps I've seen before at least displayed anything (horizontal/vertical bars, sad mac, etc.) and didn't chime or had the sad chime, so I'm afraid that swapping caps will not resolve the problem here.
If there's no other option, I'll see if I still have enough caps in stock to fully recap the board. Maybe it will magically come back to life...
Thanks a lot