Re: LG 50PK550 turn on then off

Dear friends, I have uam TV LG 50PK550 with the following problem: When I turn on the TV, the screen blinks and turns off, but the TV does not turn off or goes into stand by.
I can measure all the voltages of the power supply and are perfectly ok, according to LG technical guide.
I was measuring the crystal oscillator of 54 MHZ with the oscilloscope and no signal. I changed the oscillator crystal and it did not work.
I disconnected the LVDS cable from TCon and closed the jumper next to the R51 and R52 resistors. The screen lit up...