Re: LG - 49UB850V-ZD - No Video/Audio. Standby LED 3 Blinks. At My Wit's End!

My last try was going to be the Main Board.

My first try was the T-conn, with no change.
Then the Logic board with slight change, but no picture still.

I did as andrew suggested above and got the results shown in the pictures.

Now my debate is the Power board.
Take a change, replace, and hopefully get a working set finally.
Or just invest in a new TV.
With the trouble shooting though, I now have a spare Tconn and logic board....

Re: LG - 49UB850V-ZD - No Video/Audio. Standby LED 3 Blinks. At My Wit's End!

Bump

Re: LG - 49UB850V-ZD - No Video/Audio. Standby LED 3 Blinks. At My Wit's End!

Ok, so i put the old (original) logic board back in and did as you said. When unplugging the FFCs, the side that is unplugged goes solid white and the side still connected stays black.
Volume, input changes can be heard, but no visual cues on either side. This is true for both sides. Attached a photo of dichotomy....

Re: LG - 49UB850V-ZD - No Video/Audio. Standby LED 3 Blinks. At My Wit's End!

Hi,

Revival of an old thread, but was there any resolution to your issue? I'm having the same issue with an LG 50UF8300 set. Went through a bunch of the same checks as you (connections, capacitors, etc). Through i narrowed it down to the t-conn or logic board as the voltages seemed to check out on the legend listed on the power board.
Initially, the TV powered on, LEDs would illuminate, but no picture. Sound was there. Replaced the tconn board, same symptoms. Power on, LEDs illuminate,...