Electronics > Repair
Help with dead AT PC Power Supply
Harry_22:
Check the following points in yellow. (Without mains connection.)
naujoks:
The diode is ok.
The resitstor measures 91kOhm
The capacitor measures 0.016V in diode mode.
Harry_22:
The controller power line is shorted. Unsolder C8 capacitor and jumper wire next to it that goes to 91k resistor and measure again.
naujoks:
I measures the same without the capacitor and jumper wire.
0.016V
Harry_22:
Perfect!
Take external DC power supply. Set up 1V and 1A current limit and check the current between power lines by short them.
Connect external PS between Vcc and Gnd of controller.
Try to find a hot point on this Black PCB. If possible use the thermal imager.
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