Hey all, hoping someone can give me a bit of a steer on a problem I am trying to solve with an SE/30 I picked up last week. The logic board itself thankfully had a non-leaking original battery installed which I was relieved about - but the capacitors had done some pretty serious leaking, and in one case the capacitor was totally MIA.
A good clean, and full recap later the board is booting with chime perfectly - but I have video issues. I've included some pics here but you can see it is has permanent vertical jail bars. I've been doing lots of reading up on this issue and it seems to be a common enough problem, but I wanted to get a second opinion before I start next level of trying to fix this. Here are the things I have tried so far:
The other interesting thing I have noticed is that when I let the SE/30 boot into System 6 and then open a window and move it around the window (from the parts I can see) becomes garbled. Closing the window and re-opening it clears that and the window appears correctly again (although still with bars on it), until you move the window again and then it becomes garbled again. This made me wonder if the problem was more likely with the VRAM chips?
Thanks for your help, any steer on the next direction I take in troubleshooting this is greatly appreciated.
A good clean, and full recap later the board is booting with chime perfectly - but I have video issues. I've included some pics here but you can see it is has permanent vertical jail bars. I've been doing lots of reading up on this issue and it seems to be a common enough problem, but I wanted to get a second opinion before I start next level of trying to fix this. Here are the things I have tried so far:
- Checked all traces to and from the VRAM chips at UC6 & UC7. Also checked all traces on UE4, UE7, UG6, UG7 & UI6. All check out fine.
- Swapped the chips installed at UE4, UE7, UG6, UG7 & UI6 as well as the video ROM with another working SE/30 board. Problem still happens.
- Checked all traces on UA8, UB8, UC8, UD8, UE8, UF8 & UG8. All check out fine, also confirmed there was no ground shorts on any pins that should not have had ground.
- Reflowed UE8. Didn't help.
The other interesting thing I have noticed is that when I let the SE/30 boot into System 6 and then open a window and move it around the window (from the parts I can see) becomes garbled. Closing the window and re-opening it clears that and the window appears correctly again (although still with bars on it), until you move the window again and then it becomes garbled again. This made me wonder if the problem was more likely with the VRAM chips?
Thanks for your help, any steer on the next direction I take in troubleshooting this is greatly appreciated.