Power board showing low voltage, won't work.
I can't seem to find any decent information on the Internet , so I thought I'd try here. I'm repairing a sega Saturn I got off of eBay, the seller said it wouldn't turn on. So I opened it up and looked at the power supply...everything looks fine.
So I plug it in and all I get is non-stop chirping. I know capacitors can make that sound so I replaced all the radial caps, still chirping and won't power on. I tested voltage and I get 125 ac up until the middle of the board where the coil inductor is. I'm assuming it gets converted to DC then goes to the mother. So I tested the pins that the motherboard connects to.
They all read 0.45 or lower, it's supposed to be ground, ground, 3.3v, 5v, and 9v. I can't seem to track down the cause, as for the chirping I think it's coming from the coiled inductor. Any help on the matter would be appreciated.