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| Macintosh 128k Chimes but no Video - Not analog board |
Posted by: cadenya on 2024-01-16 17:00:54
I have a Mac 128k board (later revision) that chimes but has no screen. I’ve confirmed this isn’t an analog board issue with another working board. What could be the issue? I’ve seen some people say the RAM muxes, how do I test for that? Where even are those? Not sure what to do here. The board did have some corrosion on chips when I got it, and after an alcohol wash still has no video. |
Posted by: imactheknife on 2024-01-16 17:34:18
I know this is silly, did you check brightness knob?? Also, reflow all joints on flyback and power connectors on analog. |
Posted by: joshc on 2024-01-16 23:18:12
I know this is silly, did you check brightness knob?? Also, reflow all joints on flyback and power connectors on analog. OP said they already tried with a known working analog board.
What sort of physical condition is the CRT in? Is the neck intact? |
Posted by: imactheknife on 2024-01-17 04:15:07
if needed i do have a spare crt. Just pulled from unit with non working analog. Sorry, didn’t read whole post before answering before hand on firstly comment |
Posted by: cadenya on 2024-01-17 13:45:43
Sorry, what I meant was I tedted another working logic board in the case and it worked. It’s a logic board issue. |
Posted by: joshc on 2024-01-17 21:47:21
Reflow the power connector pins on the logic board |
Posted by: cadenya on 2024-01-18 18:36:14
Reflow the power connector pins on the logic board Sadly that didn’t fix the issue. |
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