I have 2 Mac II (820-0228-A) motherboards that will chime, but no video. I have cleaned and recapped both boards, as well as fix the usual bad traces between the VIA chips and the batteries. I'm using an original video card and matching monitor. I'm even using a recapped power supply. I've looked over the board with a microscope and cant find any bad solder joints or traces. I'm really lost on what section of the board to check now.
Mac II motherboards driving me crazy. Chime but no video after a recap.
- Thread starter jzmacdaddy
- Start date
If you have access to a scope, check and see if the nubus clock is there, it should be 10MHz. Also, if all the clocks and voltages check out, I poke at all the pins on the SMD chips with a dental pick looking for loose pads. It's more common than you'd think. Finally, and I am not sure how much this applies to Mac II's, but it is also common to find broken traces right at the pads or under some SMD chips. If one is corroded, sometimes the only way to fix it is to pull it from the board and test every trace, then resolder it with nice fresh clean solder.
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