Hey guys, it's been awhile since I've worked on any Macs. I have a Macintosh 128k (later revision board) that will chime but not show any video. I've tested the board in a known working case. When I first opened it up the board was slightly corroded, and after an alcohol wash it still doesn't work. Any ideas what the issue could be? I'm not sure what part of the board controls the video signal so I can't go around testing components just yet. Thanks!
Macintosh 128k chimes but no video - logic board issue
- Thread starter cadenya
- Start date
Hello! I have a Mac Plus with the same issue - their analogue boards are very similar. For me, I did a recap, and had video for about 5 minutes after recap, then the screen went black. I know it's the analogue board because swapping it out with another returns video. I have also swapped CRT's and their power cables. So it must be a resistor that popped or something on the board. I double checked all the capacitor connections, but I think testing them would mean taking them all off again right? Perhaps one of the new capacitors is bad? I would love to know what it is. I have a multimeter but don't know what to do or how to proceed. Have a recapped analogue board waiting for an answer....
