Electronics > Repair

Help with dead AT PC Power Supply

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Harry_22:
Good.
Please measure resistance between pins 8 and 4 of PWM.

Double check that pin 8 PWM is connected to pin 4 of optocoupler.

naujoks:
The resistance between pin 4 and 8 on the PWM is 12k Ohm.
There really is no continuity between PWM pin 8 and optocoupler pin 4.

Harry_22:

--- Quote from: naujoks on October 09, 2024, 12:36:50 pm ---Pin 4 of the opto coupler is connected to pin 6/7 on the board (pin 8 of the PWM).

--- End quote ---

--- Quote from: naujoks on October 09, 2024, 07:55:19 pm ---There really is no continuity between PWM pin 8 and optocoupler pin 4.

--- End quote ---
What pin of opto coupler is connected to pin 8 of PWM?

Please send a photo with ะก10 marking.

naujoks:
Pin 8 of the PWM is connected to pin 5 of the optocoupler.

Harry_22:

--- Quote from: naujoks on October 09, 2024, 09:43:10 pm ---Pin 8 of the PWM is connected to pin 5 of the optocoupler.

--- End quote ---

Much better!
Please measure the capacitance of C10.

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