LG42LK430 Discoloured Vertical Bar

[ModernAlien]

Hi

This is my first time working on something like this, so I hope that my terminology etc. is correct.

I saved the LG TV from the junk pile. It displays a magenta bar down about a quarter of the screen. The PSU and mainboard seems to be in perfect order as sound, video and back light works.

I found some infidelity on the ribbon cable connecting the mainboard to the T-Con (if I push it the wrong way, the picture will disappear).

The bar will display whether the T-Con is connected to the mainboard or not. The cables between the T-Con and the LCD drivers are OK. I tested this by exchanging them.

Is this likely to be an issue with the T-Con, the LCD driver or is the panel doomed?

Thanks in advance

[neilc6]

Re: LG42LK430 Discoloured Vertical Bar

Probably one of the tab bonds going to the panel. You will need to remove the shield/bezel covering it. May be fixed by applying pressure with a shim. If not, the boards are all good and can be resold. Can probably find some youtube videos if you search.

[ModernAlien]

Re: LG42LK430 Discoloured Vertical Bar

Thanks, neilc6

I'll give it a shot.

[ModernAlien]

Re: LG42LK430 Discoloured Vertical Bar

It turns out that the is the ribbon cable connection on the driver board is faulty. Applying pressure can resolve the issue, but it is temporary. I am experimenting with some shims to push it down when the bezel is screwed back into position. Thus far I could not find a reliable solution.

Do I understand correctly that these ribbon cables are glued onto the PCB, or do they use some solder that can be redone?

Thanks in advance

[tom66]

Re: LG42LK430 Discoloured Vertical Bar

They are not replaceable without an advanced rebonding machine. Sadly the screen is scrap.

[ModernAlien]

Re: LG42LK430 Discoloured Vertical Bar

Thanks, tom66

Pity. I shall shall part it out.

Thanks all for the help!