hello buddy: if I already change the electrolytic source and output voltage of the fli-bak ... review welds on all the pins of the fli-bak and output voltages of the chopper ... if the prob still persists, see if you have The Q804 board acts in conjunction with the (R814 of 0.82ohm) as an OCP protection ... (over consumption protection) ... when this R814 alters its original value it can turn off the TV erroneously ... change it by another R 0.62ohm x 2w ... or you can try welding a R of (1ohm) in parallel with the R814 and see if the TV does not turn off ... you must measure if the voltage of + b remains stable at 133v .. .as a precaution you should change the (C814 of 100mfx160v) and (C812 of 1000mfx25v) ... there is another one (protection x over voltage) q, it goes out of the tension of the rectified filament x D406 and C411 and attenuated x R451 and R452 which via zener D503 joins the line q, goes to pin 34 x-ray ... if the voltage of the + b does not remain stable it can act this protection ... change the C411 of 10mfx100v ... check all that..ok ... comment ... greetings.