Here is a link to the spec of ATX power supply. You may get some useful information from the file. Click here to view the information.
May 14, 2008 at 9:55 pm
I repaired a lot of ATX power.But now I repairing 1 ATX : Grey wire PG ( power good) =0, Grey Violet=5v .It not work with mainboard.I replace all capacitor but not work.I see IC TL494 and LM393.Difficult.
Will I doing now ? Help me.
Have a good day.
May 14, 2008 at 10:00 pm
It could be the surrounding resistors or capacitors have problem. I came across resistors open circuited and capacitor shorted that caused power good turned into 0 VOLT. Try change the IC’s, it could also cause the problem too. By the way, what is your name?
August 28, 2009 at 2:01 pm
Hi Jestine, nice sites, really. I´d like to ask you, if you could send me some schematics for ATX 300W power supply.
For the repair, it is a must and I cannot find any. Thank you very much. Best, Jan
August 29, 2009 at 5:45 pm
Sorry i do not carry any schematic diagram for power supplies.
September 1, 2009 at 4:02 pm
I regularly read ur articles about servicing. They are very helpful in many cases which can't be repaired by me without reading those articles even though i have circuit diagrams and servicing manuals. Currently I am repairing ATX SMPS which is quite new aroung 4 months and sparingly used total of around 100 hours in these 4 months. It suddenly died and now when PW switch pressed SMPS fan just rotates and then dies. Every time i tried it is in same condition. I checked all condensors in secondary and looks good. Can u help me, I want to try a hand on it.
September 1, 2009 at 9:34 pm
Fan rotates and stop is one of the most toughest problem to locate because the cause can be in the primary or secondary. Have you check the components in the primary side. What about the optoisolator circuit ? For your information you need to connect an adequate load for the SMPS to work. Without load sometimes the fan will rotates and stop.
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