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Computer Power Supply to Bench Supply Problems

Former Member
Former Member over 11 years ago

While modding a ATX power supply to be used on the bench, I accidentally shorted the 12 volt (yellow) rail to ground.  I have a load (10-ohm, 10watt) across 5 volts, but when I power up, the supply dies after a split second. The load is getting the 5 volts for a second, then dies, the fan starts and dies. Standby reads constant 5 volts still.  I don't see any changeable fuses, so is it dead?

 

Any ideas on where to begin troubleshooting?  I don't really care if it works, I'm more interested in finding out what's going on.

 

Thanks again all.

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  • kingrahl
    kingrahl over 11 years ago

    You need to activate the green power wire with the ground. Here's an instructional video Converting Computer ATX Power Supply to Lab Bench Power Supply - YouTube. If that doesn't work, then yes. It is fried.

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