My SE/30 suddenly has the checkerboard pattern. However the machine boots normally and has startup bong too.
The pattern does not go away after boot and makes the machine unuseable.
I have reseated and cleaned the contacts of the Rom sim and all Memory modules without result. Pulled and reseated the Video Rom too, no result.
I'm sure the problem is on the Logic Board as the SE/30 works perfect with my spare board.
So the Analog board, PSU and Video board can all be excluded too.
Same for the Rom Simm, Memory modules, Video Rom as I have tried these from my spare working board to no avail.
All capacitors on the logic board have already been replaced about 1 year ago: ESR values are good so they aren't the problem either.
The machine is used several times weekly for years without problem until this one. I have never seen it before with a board that still boots into Mac OS.
It's the kind of thing you see when the board has SimasiMac and needs capacitor replacement but then you don't have the startup bong and no boot into Mac OS anymore while my board still has both.
Below photos of the screen and the logic board.
What can be the problem and is this board still repairable ?
Mac 128K, 512K, ED, Plus, Plus ED, SE, SE FDHD, SE/30, Classic, Classic II, Color Classic, Mac II series, Mac Portable M5120 and M5126, Powerbook 100, Duo and 500 series.