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Burning Power Supply

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6 replies

by untamedude

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I have a clone CPU essays main board and intel celeron 3.2Ghz, 1Gb Ram DDR2, 80GB Sata Sea gate HDD. my PC hang up & i tried restarting and in the process my Power supply burnt and i changed the faulty transistor 13005 but again it burnt when i started the PC after running for 30 second just after the beep. so am asking what could be causing the power supply to burn the transistor since my power supply is supporting other PC's i did a test and it worked fine before i use in mine. Thank you

6 replies

by oh smeg

There is something else causing the Trani to burn out.

As this is a [i]HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR[/i]

I would be looking at a correctly rated Trani as the Voltage may be wrong or it may be one of the substandard Counterfeit ones but more likely whatever is controlling it has died. Look at any Polyester Capacitors and replace with Green Caps.

Though as Schematics of most computer circuits are not available it's probably easier to just replace the PS with a [b]Known Good[/b] one. ;)

Col

by untamedude

thanx man, but have tried it on a different PC and it worked fine. why is it only not working on my PC. could this be related to my other hardwares like RAM, processor or m/board??

cheers

by wdewey

If the power supply works fine in another computer and then has problems in yours then it is most likely your PC (unless there is a large difference in hardware such as the power supply came from a small economical desktop and you have a large high end machine). I personally would lean towards the motherboard and processor being bad, but the other advice in this forum looked very good as well.

Bill
edited to add info in parentheses

by thechas

First off, unless you do a full loaded test on a repaired power supply you do not know that all of the damaged components have been found and replaced.

It is very possible that your PC needs more power (wattage) than the other PCs you have tried the power supply in.

You also could have an intermittent short from your motherboard to the PC case. Or plain bad parts on your motherboard.

A mis-wired drive power connector can also result in the same problem.

Keep in mind that if you do have a power problem on your PC, putting in a larger power supply might move the fault point from the power supply to the drive or board that is causing the problem.

Chas

by robo_dev

And the failed part is rarely both the cause of the failure and the result of the failure.

What typically happens is that a capacitor or diode has shorted, pushing the transistor way beyond it's normal operating parameters. Or an inductor has overheated and shorted.

In general, these small cheap SMPS (switch mode power supplies) run on the 'ragged edge' and use components that are typically under-rated, and marginal quality. So if it fails, your best bet is to replace it.

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