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hi all just wonderin if there are any tv engineers in here i have a sanyo 28 inch widescreen tv and all the dark scenes appear GREEN ive searched net but not found a specific reason/cure. tv is only 2 years old, thanks for any help Tony
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Posted: 2005-09-06 18:44:27
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I'm not a TV engineer, but it sounds similar to a problem we had with our old TV. It was a Panasonic 32in widescreen, only three years old, and the dark scenes on the TV looked red. Apparently it was the tube - it was faulty and was in the process of failing according the the engineer we had out to look at it. Although it was only 3 years old, the tube was behaving as if it was 20 years old
And sure enough, about a month later that TV started switching itself off after the screen started going too bright, and red diagonal lines started appearing on the screen, especially visible again in dark scenes.
It may not be this, but I'd get it checked out - it could be a faulty tube!
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Posted: 2005-09-06 18:58:43
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some TVs arent made to last, i have a 10 year old TV wer the tube is starting to fail now
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Posted: 2005-09-06 19:00:47
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Could also be magnetic interference, if you have any unshielded speakers nearby try moving them away. Though it would also affect other colours it is harder to notice those. May just need degaussing.
This message was posted from a T610
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Posted: 2005-09-06 20:41:26
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Thanks guys for the feedback i think i will call an engineer but they could say anythin couldn't they or is it just me being sceptical. Dont really know what degaussing means i shall have to do more research. Thanks again
This message was posted from a Nokia
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Posted: 2005-09-07 10:34:26
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Degaussing means demagnetizing or something like that. It is when you apply an evenly spread magnetic field around your picture tube to eliminate discoloration caused by magnetic interference. It is similar to the degauss function found in most newer computer monitors. If the discoloration is even on all parts of the screen then a Degauss probably won't help.
I'm not TV engineer either but I have a little knowledge on how the colors come out on a TV's picture tube (Cathode Ray Tube, CRT). The colors that appear on each pixel of a CRT is actually the resultant light from three basic-color emitters - Red, Green, and Blue (that's why some monitors or TVs have a specialized RGB port. Each color emitter varies values from the brightest to the darkest. Black is produced when all emitters are at its darkest and white is produced when they are at their brightest. Other colors are produced by a combination of these three color's values.
When the circuit that controls the brightness of each emitter is faulty there is a tendency that the colors will come out wrong. In your case the Green emitter probably can't be brought to it's darkest value anymore so I'm guessing it's the circuit that controls the brightness of the emitters that's faulty. Just a thought.
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Posted: 2005-09-07 13:00:50
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Thankyou, fascinating stuff i'll wait and see what the engineer has to say thanks again.
This message was posted from a Nokia
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Posted: 2005-09-07 13:24:56
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Mr Balck
Any idea how a plasma screen works? Just curious..
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Posted: 2005-09-07 13:51:07
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http://electronics.howstuffworks.com/plasma-display.htm 
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Posted: 2005-09-07 19:35:38
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Engineer came made some adjustments now instead of green there's a PINK tint to everything he suggested the tube had GONE... oh well [i wasn't charged anythin]now, where's that argos catalogue......
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Posted: 2005-09-11 18:08:07
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