Thread: Discussion Troubleshooting my Dead PSU
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Old Aug 28, 2012, 08:20 AM
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Originally Posted by evltoy View Post
Back onto this project.

I ended up receiving my 2sc2625 power transistors today in the mail. Not bad for $3 postage from HK.

So.. I have removed the damaged power transistors and soldered the new one in. Screwing the PCB down and then the cover on, I was getting excited thinking it will all work.

Guess what! Power it all up and no output still.

Now the journey to fixing it continues. So what do you guys recommend I do next?
Its really tough fixing something like that w/o a schematic and it becomes a guessing game.. But, I would like to see if one of the smaller transistors has bit the dust. Do you have a diode checker on your multimeter? That can be used to check if the driver transistors are any good. You may have to "lift a leg" (unsolder) on the transistor to get an accurate readout. It looks like the transistors are labeled Q1, Q2, etc. on your board.
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