Convergence/power off I was given a throw-away PT-51HX41E. When I got it home I found it would power up, set for 10 seconds, image would suddenly loose green component, then set would shut off. I took a compressor and blew dust out from around green crt driver board. As a result the TV would now stay powered up(?), but the green convergence could not be dialed in. Research on the internet led me to conclude it must be bad STK392-110's. I pulled the board and noticed a couple of smoked resistors adjacent to the convergence IC's. I replaced the resistors with new and reinstalled the board, leaving the IC's in just to be sure it wasn't a resistor problem instead of an IC problem. When I powered up the set it now shuts off within three seconds and will not power back unless the power cord is unplugged and replugged. Can bad convergence IC's cause a power shut down like this, or is it more likely that I screwed something else up during the resistor transplant?

Lance Hanson Aug 22, 2006

I replaced the bad STK ($20.00), replenished the thermal compound on the functioning STK (hate to replace a part that's still working) and swapped out the cooked resistors ($2.50). The TV now works like brand new and I have extra parts for the next time the STK IC's fry.
For what it's worth, I noticed the thermal compound (i.e. heatsink paste) was chalky and dry under the fried STK. My guess is this was what precipitated the STK going out.
Lance Hanson Aug 22, 2006

I replaced the bad STK ($20.00), replenished the thermal compound on the functioning STK (hate to replace a part that's still working) and swapped out the cooked resistors ($2.50). The TV now works like brand new and I have extra parts for the next time the STK IC's fry.
For what it's worth, I noticed the thermal compound (i.e. heatsink paste) was chalky and dry under the fried STK. My guess is this was what precipitated the STK going out.

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No sundog this model has the potenthal to be a nice tv when you saw the burn't resisters that was your clue to change the stk's now that you have fixed the res problem the bad stk is telling the set to shut down replace stk,s i ALWAYS change both (buy the way in the future those are hi watt res THEY SMOKED FOR A REASON maybe you thought they were installed in the 70"s ha ha. but they smoked because the stk's one or more are bad. good luck doc

Posted on Aug 18, 2006

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