Thread
512Ke Video Problem
I picked up a sick 512Ke to rehabilitate and am stumped at what the problem is.
There is no startup `bong` and there are thin horizontal lines over the entire screen.
According to my handy copy of the Dead Mac Scrolls, that is a chip on the analog board gone bad or a programmers switch that is touching the board accidentally.
Well, I don't have a programmers switch and when I swap out the analog board, I get the same symptoms, and the machine works just fine with a different (Mac Plus) logic board.
So, the problem has to be the logic board, I think.... but beyond that, I'm not sure how to proceed from here.
Here's a picture, BTW:
There is no startup `bong` and there are thin horizontal lines over the entire screen.
According to my handy copy of the Dead Mac Scrolls, that is a chip on the analog board gone bad or a programmers switch that is touching the board accidentally.
Well, I don't have a programmers switch and when I swap out the analog board, I get the same symptoms, and the machine works just fine with a different (Mac Plus) logic board.
So, the problem has to be the logic board, I think.... but beyond that, I'm not sure how to proceed from here.
Here's a picture, BTW:
I had wondered about capacitor issues with older compact mac models, and it appears that SMT electrolytic capacitors are not used for them. But there are some electrolytic capacitors present so if you have the ability to test them, that could be one area to look. If there is no gunk leaking out anywhere, I would be surprised if a board cleaning would actually help... but it most likely wouldn't hurt the board either.
If you don't get advice that pinpoints the exact component given these symptoms....I agree intense visual scrutiny is a good start to see if anything has "burned up". If you can take well-light high-res shots of the board and post, there are more eyes available here to help.