Question about Compaq Deskpro EN FC 6450+ Model 10000 (129279-052) PC Desktop

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Repiring when start the PC red light blinking every 2second & more.mother board discription was found power crowbar faulty(if aplicable).but i dont find on mother board crow bar section.please help me

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  • shankar pandit Jan 04, 2008

    compaqdesproEN,815motherboard,red light blnk.power crow bar problem(if aplicable).how to repair this problem



1 Answer

Your motherboard is faulty. replace.

Posted on Jan 04, 2008


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Power supply

A crowbar or crowbar circuit is an electrical circuit used to prevent an overvoltage condition of a power supply unit from damaging the circuits attached to the power supply. It operates by putting a short circuit across the voltage source, much as if one dropped a tool of the same name across the output terminals of the power supply. Crowbar circuits are frequently implemented using a thyristor (also called an SCR) or a trisil or thyratron as the shorting device. Once triggered, they depend on the current-limiting circuitry of the power supply or, if that fails, the blowing of the line fuse or circuit breaker.
A crowbar circuit is distinct from a clamp in that, once triggered, it pulls the voltage below the trigger level, usually close to ground. A clamp prevents the voltage from exceeding a preset level. Thus, a crowbar will not automatically return to normal operation when the overvoltage condition is removed; power must be removed entirely to stop its conduction.
The advantage of a crowbar over a clamp is that the low holding voltage of the crowbar lets it carry higher fault current without dissipating much power (which could otherwise cause overheating). Also, a crowbar is more likely than a clamp to deactivate a device (by blowing a fuse or tripping a breaker), bringing attention to the faulty equipment.

The power supply is bad. I would not try to fix it.

Mar 01, 2008 | Compaq Deskpro EN PC Desktop

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