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Burning Power Supply

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OH Smeg

There is something else causing the Trani to burn out.

As this is a HIGH VOLTAGE FAST-SWITCHING NPN POWER TRANSISTOR

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 Known Good one.

Col