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?

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. 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.

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. 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.