Lg 42lg5010

[zerocool]

Hi all,
This is my second posting, with another fault that I would be grateful of any assistance in solving.
I recently picked up an LG 42 inch LCD tv, the backlight is okay, I have checked all voltage outputs from the power supply board, and these all check out okay. There are no bulged capacitors, so the power board appears to be okay.

The problem with this is that the picture on the TV is very poor, there are multiple lines on the screen and the colours are all over the place.
I am hoping that this is not the dreaded ribbon bonding to the screen and that someone out there with a vastly superior knowledge than mine will be able to point me in the right direction.
At best I'm hoping that this will just be a board problem and as such a relatively easy/cheaper fix than binning the set.
I have attached some picture of the screen, and also of the rear of the TV.

Any help with this will be gratefully received


.

[zerocool]

Re: Lg 42lg5010

Hi again, I was wondering if anyone has had this problem before, I am told it could be a tab bonding failure but I am unsure if it's this as there are no visible lines down the screen, or if it was the TCON board at fault. I know that TCON boards give varying issues with regards to the display, but I was hoping someone out there could point me in the right direction.

Thanks.

[tom66]

Re: Lg 42lg5010

I would say tab bonds / panel fault.

[zerocool]

Re: Lg 42lg5010

Thanks tom66 for the reply. I have checked the tab bonds, and also both ribbons to the TCON board and I cannot seem to alter the picture in anyway- good or bad.
As an update to my last post, while watching the TV, the sound is okay but for a high pitched almost squealing click for a split second every now and then. Part of me thinks this might be a capacitor discharging but I've visually inspected all the capacitors on the power supply board and these all look to be okay. Is it possible that I may have a faulty main board or TCON board with bad capacitors?
Has anyone had to replace capacitors on any other board apart from the power supply board.

[zerocool]

Re: Lg 42lg5010

Hi all, Have not had the time to continue fault finding with this TV, but I will persevere and I will post and let you all know the outcome, good or bad.

[budm]

Re: Lg 42lg5010

It sounds like you are have failing x/y drive ICs which are on the flexible PCB. The squeal may be coming from the round inductor on theT-CON board due to too much current being drawn by the ICs.
https://www.badcaps.net/forum/showth...ight=LG+47LH55
post 10:
https://www.badcaps.net/forum/showth...ight=LG+47LH55

[zerocool]

Re: Lg 42lg5010

Hi all, Thought I would post and give everyone the good news. The fault with this TV turned out to be the TCON board. Took the plunge and purchased a second hand one from ebay, fitted and now all is good.
Thought that this might be handy for anyone that may be having or may have in the future, a similar fault.
But once again thanks to all on this forum who have taken the time to help me out.

[tom66]

Re: Lg 42lg5010

Well, I didn't expect that, nice fix.