Semiconductor heatsink i am trying to replace stk392-040 semicconductor on projection tv. i have taken off heatsink box to try to gain access to semiconductor. but cannot take them off. any suggestions. can you buy the whole board or do you have to remove semiconductor some way..or would a local tv repair help replace .

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HI I'm having problem with blown fuse by the power input. after I plug in the power cord the fuse is blown seconds later. is the board bad...............\\

Posted on Jul 12, 2007

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They can be very stubborn. If youve taken the heat sinks off the circuit bd so it is in no danger just knock em off of there they can be stuck good. If is the circuit bd your talking about then I guess you realize they are soldered in to the bottom

Posted on Apr 23, 2007

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Try pulling the back plastic cover off and colling it with a box fan and see if it still happens. You may have a heat buildup on one of your heatsinks. If you are technically inclined, you can use a temp probe and locate the offending component and clean off the old heatsink paste and apply a fresh coat then screw it back down.
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You will be watching and the tv will go black & volume goes away almost like it turns off for 45 seconds then it will turn back on first with picture then sound for like 2 to 3 mins then it happens...

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