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I have an LCD TV. All of a sudden the picture colour has gone wierd. The best way to describe it is that it is similar to either a colour negative or one of those scientific 'false colour' images. This problem went away for a day but now seems to be back permanently.

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TFTs can produce a wide array of colors, but it takes an enormous number of transistors to make up a display, and a problem with any one of them creates a defective pixel on the screen. Typically this shows up as a bright spot on a dark background, caused by a damaged TFT failing to turn off a pixel. Most active matrix displays contain a few bad pixels, but a few bad pixels are not going to have much of an impact on the overall picture.
The properties of liquid crystal material can create problems with viewing angle effects, causing the image to darken, disappear, or reverse the dark and light tones when the viewer is not directly in front of the display (kind of like looking at the negative of a photo). The light bulbs make LCDs heavier than the plasma TVs (though they are still lightweights compared to CRT televisions.
Benefits of LCD TVs include a picture that can't burn in and doesn't deteriorate over time. Because of their flat-panel nature, placement options are plentiful, optimizing the cool factor over standard TVs

Posted on Apr 30, 2008

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One of the integrated circuit chips has given out. The TV digitizes incoming signals, then processes the picture in layers. One part of the process is adding the colour. This is done by the Painter Chip. It sounds like your painter chip, or some part of the circuit around it, has given up.

Diagnosing exactly why the chip has gone faulty and then repairing the defective part is going to cost a chunk of cash. So weigh up the whether it's worth investing in an older TV versus replacing the set for new.

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A repairman must open the tv and check it out.
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1 Answer

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This is a picture tube type TV. No lamp.
You don't describe the distortion.
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1 Answer

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Can you post a picture of what your screen looks like along with what is the model number of your set.

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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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This is no solution but a point in a probable direction.

A tech guy told me ALL the LCDs they have seen in their repair shop have "swollen" capacitors, this is due to voltage instability. Lowering the internal voltage regulator and replacing the swollen capacitors (which eliminate noise) apparently restores the LCD to new working quality. Without actually "seeing" my problem the tech said that should repair it. I have not tried this yet but eventually will begin that way.

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