Hello everyone,
I'm trying to fix this SY-5SSM motherboard (Socket 7).
When the PSU is connected it powers on by itself but there's nothing on the POST card, no beeps.
The BIOS EEPROM is ok (latest BIOS was flashed).
All the jumpers are set ok.
All the 1000µF 6.3v (14) and 1500µF 16v (2) caps are in spec.
There are two 76129D MOSFETs (
datasheet). I took them out and tested them and they are ok (no continuity from drain to source) in off state.
But the voltage in the gate of the second 76129D fluctuates between 1.468-1.649,...
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