Electronics > Repair
Help with dead AT PC Power Supply
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Harry_22:
Drill out the center of the chip with the crystal.
Check all the pins for short.
naujoks:
Ok, done. The short is gone.
Here are the chip connections (see picture):
Chip pin 1 - contact 2
Chip pin 2 - contact 1
Chip pin 3 & 4 not connected
Chip pin 5 - contact 3
Chip pin 6 - contact 4
Chip pin 7 - contact 5
Chip pin 8 - contact 6 & 7
pienari:
Is that dip8 just pwm controller?
Harry_22:
Please see PWM controller pinout.


Double check Current Sense pin.

Clean pins 4, 5, 6 of optocoupler and ring the connection as well.
naujoks:
I drawn lines in to the picture where the pins of the PWM connect to.

Is the opto coupler the chip next to the PWM? Are those the right pin numbers?
Where are the pins supposed to connect to?
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