I have this tv with this problem: at start-up, the St.By LED flashes twice, after which it stays in St.By, sometimes the LED flashes twice in a cycle of 5 times. At the start, for a moment, is present the tensions PFC = 390V, voltages of 5.2V, 12.7V and voltage for led driver, after that this tensions fall in 0 https://showbox.bio/ https://tutuapp.uno/. I replaced ICP801S = SPC7011F, ICM801 = FSFR1700XSL, the electrolytes caps beside these two integrated and PC801S, PC802S, PC803S optocouplers, I redo the soldering, including the smd components, "cold" measurements on components. Only the voltage St.By = 5.2V, the rest, no change. With the coupler removed from the mainboard, the backlight does not work at all. Maybe someone has encountered this problem, thank you!
