Question about Panasonic TCL42U25 42 in HD-Ready LCD TV

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HI There, I have a TCL PDP42U3H, voltages on power board are within specs. Getting full picture but very dim with lots of background noise, colours seem to be like inverted like looking at a negative with very poor image definition, aqua and yellow seem to dominate picture colours. Thinking maybe the plasma panel has reanched end if its life? Your thoughts appreciated. Sincerely Aaron.

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I was a little confused as the model is a Plasma Screened set and you wrote LCD. Not to worry. In the old days, people were told that the display on plasma screens needed to be "re-gassed", this is nonsense. The gas goes no where and is inert anyway, made up of elements like neon, argon and a few other choice U/V emmiting products.
I would say you have a power supply problem in conjuntion with a video pedastal problem. The plasma screen has a half life of some 17000 hours, which is enough for ones eyes to turn square. Thereafter the same again until the picture dulls dow to a still acceptable level.
The supply voltage is not the critical one it is the bias voltage on the video processing that is all important. Do you remember the old colour TV's with pedastel problems and negative/inverted colours, (ITT CVC9 comes to mind instantly here).
If you have a service manual, check the waveforms around the video processor for inconsistencies, if you haven't it is a workshop repair anyway but without a manual you have no real way of knowing what you are looking for.
Hope that sheds some light on your problem.

Posted on Nov 03, 2010


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Here is a possible list of things that might be wrong:

1) CRT going bad (The shop can try CRT rejuvenation if needed)
2) High Voltage on the anode not at proper levels (The shop can check this with a HV probe)
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These are the three primary possible issues.

I hope this helps,

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