Check for loose solder connections at jumper 010 & 050..050 jumper is located left side of convergence sig board between c7791 & c7798..jumper 010 connects to D7809...This will cause F850 to blow continuously..Thanks Arlie
Resolder jumpers on signal PCB..May be near convergence IC circuit..on 50" model they are 050 & 010. You may have solder cracks..I repaired a 50" toshiba..Let me know if this fixes
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