LG 42LB5D screen

[Jwheld]

The following is the symptom my tv is showing... the bottom 1/4 of the TV flickers in and out. Occasionally it works perfect. I recently replaced the TCon because I fried the old on trying to diagnose, and the defect persists. I've checked all of the power supply outputs and all show correct voltage.

My thought is that it is either the inverter boards or the display itself. The fact that it's intermittent seems like a possible bad connection but I've checked the all and cleaned with alcohol, made no difference.

Any input is greatly appreciated. Maybe there is a sticky I can be pointed to.

[Andrew F. Ali]

Re: LG 42LB5D screen

Bad panel, all right. I had a Samsung that showed just like yours...

[Jwheld]

Re: LG 42LB5D screen

Is it repairable/replaceable?
If so, is it worth it?

[heavymachines]

Re: LG 42LB5D screen

If it is a bad panel no it is not unless you have a $5,000 tab bonding machine. I suppose you can do some checks to be sure it is bad panel. You might be lucky to be able to remove a bad tab and the ones on other side will take the load but i dunno if it can be done on this tv. Those with experience will have to chime in on that one.

[Jwheld]

Re: LG 42LB5D screen

Thank you for the input. I'll see if others have comments.

A simple check to be sure it's the panel would be great. As mentioned I've checked the power supply and TCON. Is there a check for the inverter board? This would the the only other thing to eliminate before deeming the panel faulty.

[Davi.p]

Re: LG 42LB5D screen

Don't waste time and peace of mind, the image tells clearly that backlight is not the problem. When you see the flickering have you got an image distortion? Watching this image i can suppose that maybe you have a failing bottom side tab on the left, i need other 2 images if possible. But only to do a diagnose, i think anyway there's nothing you can do without an oscilloscope. Maybe be you can do a jump between tabs..

[Jwheld]

Re: LG 42LB5D screen

Don't waste time and peace of mind, the image tells clearly that backlight is not the problem. When you see the flickering have you got an image distortion? Watching this image i can suppose that maybe you have a failing bottom side tab on the left, i need other 2 images if possible. But only to do a diagnose, i think anyway there's nothing you can do without an oscilloscope. Maybe be you can do a jump between tabs..

The image does not distort when it flickers. At some times, the whole picture looks perfect.

What other images would you like? I can surely upload more this evening.

[Davi.p]

Re: LG 42LB5D screen

An image not black in the problem part. It's the precise separation between normal image and faulty part that says to you it's a lcd panel problem.

[budm]

Re: LG 42LB5D screen

Bad panel.