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which electronics board to replace in LCD? (gray vertical lines)

My parents' 8 years PILOT 37" LCD TV displays thick vertical gray scale lines.

It happened 3 weeks ago, suddenly, the picture became gray, the sound kept on for a while and then disappeared.

Exact model : PIL3700CH (pic 3)

Observations :

1. When I connect it to the electricity - the red led outside of the tv is on.

2. When I turn it on (using the remote control or the on button) - the green led outside the TV is on.

then, the screen display is all gray (pic 1), and then it stables at these thick vertical gray lines (pic 2).

pic 1 :

Block Image

[img]http://tinypic.com/r/2nvb3pg/9[/img]

pic 2 :

Block Image

[img]http://tinypic.com/r/fo1xdy/9[/img]

pic 3 :

Block Image

[img]http://tinypic.com/r/24pkiki/9[/img]

3. when I opened the back cover - I did not notice any blown capacitor, nothing seems or smells burnt.

4. I have googled a lot, and now I assume that the fastest solution will be replacing one of the electronic boards (T-con / main / power / inverter ).

but I don't know to relate the symptoms to the right board failure.

Does anybody know this issue and can advice please ?

Thank,

Doron

Answered! View the answer I have this problem too

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dbarshap going by your images alone, I'd start with the T-con board. Your inverter etc is working since you do have a visible display.

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Well its either your tcon or main board. The power board is where the power comes in from the line and is then converted into DC and broken up into different various voltages for the other boards' functions and the inverter board is what runs the backlights for the TV. One thing that might help you determine what to replace is sound. Can you hear the TV show or movie while the screen goes grey? If you can then it's probably not your main board; it has all the inputs and outputs for the TV including audio, if it doesn't have sound I'd lean towards the main board being bad. Unfortunately with limited skills and no trobleshooting ability you may have to replace both boards to solve this problem.

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dbarshap will be eternally grateful.
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