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Picture and colour problems

Plasma 42px4dv, of late I have been getting a problem which seems to be centred around the middle of the screen. But not always there...
In certain light conditions( low lighting and evening shots) shadows that would normally be grey/black especially on peoples faces appear in green pixelation rather than how they should look...

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  • Anonymous Apr 06, 2008

    My Samsung HL-S5679W seems to have trouble with low-light situations and pixelation. During some low-light movies, the picture becomes very pixelated an grainy. I am not sure if it is due in part to the signal to the tv or if it is a setting I can try.

  • greg685 Nov 17, 2008

    I have a similar problem with HLS5679w in lower brightness scenes colors that shoud be gradiated or subtle transitioning color instead is blocky meaning large areas present as the same color. Its as though ithe TV is rounding off the color values instead of displaying the transitioning areas of color. This is most noticable in lower brightness scenes and in blues transitioning to dark blue transitioning to black. This is very displeasing to the eye. Another symptom on my set is that it periodically (maybe every 30 minutes) returns to dynamic mode as though it is returning to default.

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Your DMD board is bad.. I had the same problem. It went away with a new DMD board.

Posted on Jul 22, 2010

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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...


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.

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1 Answer

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Bring set to service shop, because in this case happens twoo things: 1)module defects and 2)some problem connection between module and driver

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Picture has double images around the edges of the viewing area.


Firstly check for correct colour registration at centre of screen. Look for coloured halo around white edges in centre area of picture. Use static convergence adjustment if necessary to correct centre of screen. Then follows an involved process of interactive adjustments to attempt correction of errors at the screen extremities. If these are out of adjustment range this is indicitive of a convergence drive fault requiring professional intervention.
I hope this information is helpful!

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What is the model number it sounds like pixel problems or board problems. For more info ctechnicians.com

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I had the same problem with mine, LG techs came out to my place and upgraded the software and the problem went away. I had mine for nearly a year when it started, supposedly is it quite common. Anyway, dont worry too much about it as easily fixed. I have been very happy with my TV and have used it everyday for 16 months. Just want a higher resolution TV now.

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