[TechAssist] Need help on RCA CTC177AF3

Set came in with shorted HOT (Q4401). I replaced HOT and IFT sparked & shorted 
new one at turn on. Replaced U4101 (STK730-130) & Q4401 then set operated with 
normal picture for about 2 minutes then Q4401 shorted again. Any help is 
appreciated. I am working with no schematic. 

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