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Equipment Repairs => LCD TV forum => Topic started by: bluettino on August 18, 2021,09:03:01

Title: lg 55uh 770V vertical band
Post by: bluettino on August 18, 2021,09:03:01

Hi all.
I have a  lg 55uh 770V  with vertical band. No audio powering on. Backlight ok. I attach some a picture that show the problem.
There's a IC very hot, indicated by the screwdriver.
The voltages seem ok, 28 V vgh, vgl -5,x V. One of the COF connector feels very hot, but only the one indicated in the last photo.
Is there any possibility of repairing?

Thanks in advance for the help

Title: Re: lg 55uh 770V vertical band
Post by: downunder on August 21, 2021,03:38:47

If that flexi-cable between the t-con and the panel is heating up, you likely have a short in the display panel that's dragging a lot of current through it. So with the TV in the phote 3 state (that flexi removed) do you get a white screen on that side half of the screen. If yes, refit that flexi and remove its mate, and see if you get a white screen on the other half.
If removing either gives you a black or full-of-artifacts half screen, then your panel is indeed shot. Before condemning it outright, check the surface mount chip capacitors on the 2 narrow boards along the bottom for shorts. Both boards will have a fairly similar layout so you can compare sides.