Imac Power Supply No voltages except 20-24 volt only

[8cuda]

Imac 17 Power Supply
661-0293 180W
API3PC94-290
03K22-0006I Rev A
I get 23 volts on pin 22. No other voltages on the other pins. I measured between the capacitors of 318 volts.
There are no 3.3, 5, or 12 voltage

[Toasty]

Re: API3PC94 Imac G5 Power Supply - No voltages except 20-24 volt only

There are at least 20 threads here dealing with these PSUs and their problems. Use the search function and do a bit of reading.

The API3PC94 is the board model and can come in different cases, such as your 661-0293, but may also be found in 661-3351 and 614-0293. Cases got switched about a lot. That's why it's best to rely on the board model number for troubleshooting.

If there is 20-24v, there should be 5v standby also, since they both come through the standby transformer. If not, that's the place to start troubleshooting.

Welcome to the forums!

Toast