Hi friends!
I'm trying to fix those 2 power supply from 110VAC to 36VDC.
Both of those power supplies had a problem that I fixed, one has the PWM driver and his mosfet dead, I changed them.
The other one had the rectifier input bridge from the primary was dead and I replaced it.
And the two power supplies gives me this result:
Downloas video ->
https://gofile.io/d/m8LRO8You can see the failure, it looks it want to start but it "stops"... I can hear a little noise when it cuts in the transformer.
I replaced the PC817 optocouplers too it doesn't fix. I replaced the LM431 voltages references, same.
When I quit the PC817, the protection test lamp turns on, the power supply do the same but with a lot more power (That's why I think the feedback side is correct?)
I checked all diodes and resistors, everything looks to be okay...
More info:
The driver is the CR6842
The mosfet is the 16N60
The schottky rectifiers diodes are MBRF202000CT
The optocoupler is the PC817
The voltage reference is the LM431
What I have forgotten to see or what do you think those power supplies problems are? Hope they can help me, sometimes I had this problem on power supplies and I never managed to fix it...