Thank CapLeaker.
of course I ment high ESR not high EAR. Lol...

Success! Replaced the P6KE200, the TOP248YN, and three small capacitors that had high ear ratings and it now alive and kicking,
thank everybody!...

Hmmm, so you think it might be OK even though it tests as a resistor?
All i have is one of those basic TC1 testers (picture attached).
Do you know how I could test it properly?
Thank you....

Pulled just about everything off the board to test out of circuit.
Turns out that it was none of the above.
It was the diode at D7, a P6KE200 testing as a 15.6 ohm resistor instead of a diode.
Thanks everybody.

Hey CapLeaker,
I was suspicious of the TOP248YN despite it looking immaculate. Can you tell me how to test it if i remove it?
Also the cap that R_J suggested i look at tested with some crazy value 1346nf when it is supposed to be 4.7uf/50v.
Still don't understand the strange reading on the diodes i mentioned previously.
Would really like to round up all the suspects before placing and order with digikey. So sad that there are no longer any local stores to pick up parts as needed.
Thank you!

Hey R_J,
Thank you for the reply!
The 4.7 uf 50v capacitor at C18 is not shorted. It tests as 124 uf in circuit. Does that mean it is bad or does it not test well when in circuit and I should remove it to test again?
No shorts when i check between 12v pin 3 and -20v pins 4/5 and 20v pins 9/10
Looking at the diodes, i did find a few anomalies: With the meter in diode mode, most gave a reading with the negitive lead on the cathode and ol when the leads were reversed... except these...
The two at D5 and D7 (between the black heatsink and the yellow transformer) reported...

Hello Everybody,

Trying to repair a power supply from a Russound CA4 Multizone Controller (picture attached)

Russound no longer supports it but were kind enough to provide a schematic of the power supply (pdf attached).

The outputs marked 12v and 20v are all measuring only 1v.

The board is clicking, which I think means it is in something called hiccup mode when the flyback transformers switches because of an internal problem or something else on the board Overloading it.

The capacitors physically look clean (no bludgesor leaks) and...