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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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  • 9 Answers

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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2 Answers

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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I have a similar problem with an LG (except my red is the one that is fine) and was able to talk to a tech in some detail about it. The tech prefaced by saying that he had done a hundred or so of these with exactly the same issue. This is very common and the life span of rear projection televisions is not great. Having said that, plasmas and LCDs are also limited in life span mostly due to modern high performance gaming machines which shorten the lifespan of monitors both plasma and LCD alike.

From what I have gathered, this is not a problem that you can easliy sort out. (Of course they would say that though) It involves replacing the digital board which means soldering followed by aligning the lamps which requires quote a lot of expertise.

The part itself apparently costs around $200 Australian and the labour will vary for the cost of the technician but I was quoted that the labour was about the same cost as the part.

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Inside of the tube assembly, there is a cooling liquid. This could be a job to change, and then re-adjust everything. It is also possible that on top of this, there are problems with the convergence and bias control circuits.

Typical repairs can run in the area of about $400 to about $800 depending on the amount of work and type of parts required.

Personaly, I would go out and get a good Plasma or LCD TV at this point!

Jerry G.

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Can you post a picture of what your screen looks like? I may be able to help you if I can see whats going on in a photo.

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