Question about Compaq (243890-001) 250-Watt Power Supply

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I'd assume this machine uses an ATX design power supply. ATX and other late designs (after the days of the AT style units) have a standby voltage supply which powers just a small portion of the motherboard circuitry (voltage= +5 volts). Your problem is likely caused by one or more electrolytics in this standby section. If you open the supply, you should see at least 2 switching transformers, likely sitting close to each other. One will be large (for the main/full power) and a small one (for the standby section). Usually the bad capacitor is on the primary side (on the side where the switching transistor is). It may be a 10MFD/50Volt or 47MFD/25Volt, or some value close. If the bad cap is on the secondary side (the section which is connected to your motherboard), then the value will be something like a 1000MFD/10Volt or 16Volt, or 1500MFD, 2200MFD. This capacitor will be physically larger than the one noted for the primary side. I can't tell you the exact location on the board where these capacitors might be, except they will be close to the small transformer mentioned above. If you have a digital camera, and could take a pic or 2, I might be able to point to the exact suspect part. You could send pic to Of course, you need a solder iron/solder, and a little skill...

Posted on Jun 27, 2007


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