I have a ChiefMax 550 watt ATX switching power supply problem. When I hit the power button the fan jerks and than nothing. I took it out of the computer and jumpered the green start wire to a black gnd. wire and hooked a CD Rom for a load and when I put power on it the Fan jerks the light on the CD Rom flashes and thats it. I have looked at all the components and no blown fuse, no bulging cap's and nothing that shows any sign of failure. I know it's cheaper to buy another but I'm fooling around trying to learn electronics, what better way than this haha. Does anyone have any idea what I should check first, would it be the high voltage side. also maybe sombody knows where i could get a schematic for this model?? Jim P.S Also it has a F12C20C Mospec rect. that I don't know how to test with a multimeter? Total of 3 on the secondary side, the other 2 I know how to check but not the Mospec??
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Re: ChiefMax 550 watt ATX power supply problems
Well I think your first problem is that it's a ChiefMax...they're not known for being high quality (see here).
It'd be a good one to use to learn with though (that's what I did with my logisys/keerda and my LIC PSUs). What I'd recommend is getting a new, quality power supply for your computer, and then keep this one to play with and experiment on and upgrade.
A fan twitch and then nothing usually indicates a short on the secondary side. Check everything for shorts. MOSPEC is just a brand of semiconductors, chances are that's a 12A 200V diode pack, so you should be able to test it just like the others.
Pictures help too! Good luck! -
Re: ChiefMax 550 watt ATX power supply problems
Yes I agree It's no good, light as a feather first clue without opening it, lasted about 2 weeks and no it will never be in another computer. Open case and no transient filtering, very small transformer,very small heat sinks, just a few things even I can see and I'm just learning. But good to practice on as I can't hurt this thing haha. About this mospec F12C20C I can read the other 2 rect. ok (meter neg. on center leg, pos. on either right or left leg and about 80 ohm reading. Meter pos. on middle leg 0 ohm on right and left leg.) Wow I just looked down at my paper and when I write that down it comes out PNP and NPN?? But on this mospec that won't work or it's really shot. The big filtering coil in front of this rect. has the insulation coating melted off about 1/4 inch up from board and the board under the rect. shows signs of heat ( I pulled all 3 rect's.). I can't post pictures now, mom fell and broke both knees caps and I won't have much time (85 years old and that makes it really bad.) I want to thank you as this has already helped a lot. Thanks Again JimLast edited by jhh; 02-01-2010, 10:33 PM.Comment
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Re: ChiefMax 550 watt ATX power supply problems
Cheifmax are leadman, there is no hope for them unfortunately. I would just pitch it, or bring it to Dr.Glock like kc8adu does. He does a good job of repairing them.
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Re: ChiefMax 550 watt ATX power supply problems
WOW WOW that's what it was the F12C20C Mospec rect.. Replaced and power supply runs like a clock. thanks all JimComment
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