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Sony PVM-20M4U I have this Sony PVM-20M4U pro monitor which blew the horizontal output transistor Q501 (2SD1878). I've replaced it and it seems to be working ok...exept that the transistor is getting almost hot on the heatsink. I've checked the waveforms on the base and collector and they seem to look clost to what the service manual shows. My question is, do these transistor usually run that hot? Or is there supposedly something that's causing it to get that 'warm'? Bob

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These will run a bit hot, but make sure you have enough compound on it. If the old stuff was dry, use a solvent to remove it and replace the compound with plenty of new stuff.
Dan

Posted on Jun 06, 2008

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