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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Get a generic switchable power supply, just look for something like "universal laptop power supply" in the shop of your choice. Be sure to get one with appropriate connector and voltage, at least 120 wats (as that is how much power your laptop will draw, a weaker supply can survive for some time but will fail eventually).

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Just Plain stopped working

I'll assume you've already checked the obvious possibility that the outlet the computer is plugged into is not working.

Here's a diagram of the main power plug from the supply:
With a short wire (like a bent paperclip), short the green wire PS_ON to the ground pin on either side of it (in the same row, not directly across in the plug!!). The power supply should start up if it's working properly. If the supply doesn't come on, replace it. If it does, then you'll need to replace the main board.

That's the way electronic components usually fail. The initial surge when you turn something on causes a part that was ready to fail to go bad, the same way a light bulb usually burns out when you turn the light on, and not while it's already lit. So the computer was working fine, then the next time you turn it on....pffft!

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Bestec atx-250-12z rev d hp model 5187-1098 pc will not start up when pushing button on front of machine green led on back of p/s flashes with power cord plugged in. does this indicate a p/s failure?

I have already replaced mant Bestec ATX-250-12E power supplies because they have an internal failure. Consider yourself lucky if the thing doesn't power up your computer because it has a problem of imposing the +12 volt line onto the +5 Volt line then blowing out the mother board. Sometimes you aren't so lucky because once the damage is done then it is to late to just simply replace that piece of junk. I was lucky with my daughters E-Machine because if she tried pressing the start switch on the front of her computer it would sometimes come on and sometimes not. She just mentioned this to me and I immediately replaced that Bostec ATX-250-12E before it could do any damage to her computer. If anyone has an older E-Machine or an older Gateway machine then it would be a good idea to see if it uses that Bostec-ATX-250- 12E. If it does then go order another power supply, anything but a Bostec, and instead of a 250 watt order a 300 watt or better. I hope that this has helped those that might have this problem before it destroyes *********** boards. Marty

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My laptop battery is not charging 100percent

Your Battery gone bad. So replace your battery.
If you have active contract call bto your laptop technical support they can help you in replcaing it.
Hope This Helps!!!  Please Don't Forget to Rate my Response!!! Thanks!!!

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