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A 32-bit fifth-generation video game console that was first released by Sega on November 22, 1994 in Japan, May 11, 1995 in North America, and July 8, 1995 in Europe.

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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.

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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.

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I'll give it a shot, thank you for the reply. I have the US version and most of the schematics I've found are PAL and of no use to me. Even if I find the component I don't know the value of it.


The circled component is not an Inductor but a transformer. That right there could be the issue.


That's what I figured, problem is how to repair/replace it.


You won't be able to repair the transformer, so you,ll have to replace it. Best would be to get either a replacement PSU board or try to figure out what values the transformer has. Try to measure the output voltage. Check the bottom of the board for colder solder etc.


Yeah , I just ordered a psu off eBay. Appreciate the responses.


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