LG375000 tcon / signal board / panel fault ?

[llonen]

I have this set in the workshop, initial investigation showed set would start with back-light and, audio and otherwise working main-board but no picture, after a while I would get some vertical lines showing.

Sourced and replaced the Tcon controller as they were available for this model cheaply, I get a similar pattern of lines which are a mix of vertical and horizontal see pictures. This seems to change a little over time.

Was wondering if I have a bad panel, or bad video processes on the signal av board or if the replacement tcon itself was faulty.

Excuse the moire pattern from the phone camera

[budm]

Re: LG375000 tcon / signal board / panel fault ?

Did you try having ribbon cables between LCD panel and the TCON bd. connected one at a time to see what you'll get?

[llonen]

Re: LG375000 tcon / signal board / panel fault ?

As requested pics of panel display,

left lvds cable connected I tend to get a display as below, there is some wondering with the vertical lines back and forth but tend to be left side of the panel disp. With right only lvds connected the back-lighting stays off, candling with a high intensity torch seems to suggest no image on the display panel right or left although cant be certain of this. I may have to force back-light on to verify.


Regards Mark

[llonen]

Re: LG375000 tcon / signal board / panel fault ?

Apologies to Budm, I think I misread your posting, any-ways the below pics are as requested with Tcon to panel display ribbon cables removed (R) (L) respectively

Many thanks in advance

[budm]

Re: LG375000 tcon / signal board / panel fault ?

Those Horizontal lines cannot be caused by the bad T-CON, I would say you have bad panel.

[llonen]

Re: LG375000 tcon / signal board / panel fault ?

So not likely to be anything else, I have sourced a signal main AV board but am not going to order if this is a panel failure, I was wondering what failure mode this would be as it was always my understanding that a failed tape carrier package or related electronics would only affect a region of the screen.

Regards Mark