Chosen Solution
Hello, 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.
Thanks, Chris
chris, attach some images of where you are measuring as well as of your PCB’s. In particular the “coiled inductor”. Use this guide for that. That will help us to help you. also, give us more information about your console i.e. PALS/NTSC etc. You can measure the PSU according to the attached image.
