LG 42LD450 no picture&sound problem

[spyrex]

Hi,
I have 42ld450 Lcd TV. Picture and sound goes off when watching. I powered off and on but red light blinling continuously without backlight, picture, sound.

I checked voltages from PSU and there is no problem about voltages.

There is a switch on logic board and when press it backlights turn on for a second and goes off. I think backlights working well.

Do you have any idea?

[spyrex]

Re: LG 42LD450 no picture&sound problem

I replaced all capacitors on powerboard but nothing changed.

Powerboard voltage outputs like this;
Left side values printed on pcb, right side values measured.
3,5V - 3,3V
12V - 12V
20V - 21V

I noticed that when turn on tv and measure voltage from logicboard to T-con, multimeter shows 0V.