John P
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| posted on 10/3/13 at 05:17 PM |
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What Causes this on LCD TV Screen?
Our Samsung LCD TV is quite old now and for some time the screen has been getting progresively worse.
The screen has what almost looks like a film of oil on the surface which is clearly visible when on a blank screen but much less so when normally
on.
[img]
 
Samsung TV Picture
[/img]
What causes this?
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austin man
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| posted on 10/3/13 at 05:25 PM |
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looks like an image has burnt on the screen this happens with PC screens if left on with no activity for prolonged periods
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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jossey
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| posted on 10/3/13 at 05:25 PM |
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put it on a terestrial TV channel with the snow on for 5 or so mins.. if your tv will allow. This should sort it.
[img]http://findingthemotherlode.files.wordpress.com/2012/10/tv-snow.jpeg?w=300&h=225[/img]
They do have downloads which do this if you cant get terestrial snow...
Please let me know how you get on....
[Edited on 10/3/13 by jossey]
Thanks
David Johnson
Building my tiger avon slowly but surely.
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theprisioner
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| posted on 10/3/13 at 05:39 PM |
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Looks like Moir fringe effect when two gtatings are at different angles. One grating will be the arrangment of the LED dots. The other is usually in
the signal or transmission or can be internally the form of noise but I don't know what is causing it specifically in your case but the PSU
would be a good place to start
http://en.wikipedia.org/wiki/Moir%C3%A9_pattern
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John P
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| posted on 10/3/13 at 06:56 PM |
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I tried the suggestion of tuning to an old analogue channel and leaving the snow on screen for around 5 minutes but it doesn't seem to make any
difference.
I've seen a suggestion of holding an ice pack close to the screen in the affected areas to try to smooth out a film which is apparently inside
the screen and can become wrinkled but this all seems rather questionable.
Any other suggestions or is it at the end of it's life?
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Ninehigh
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| posted on 10/3/13 at 07:17 PM |
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quote:
Originally posted by John P
Any other suggestions or is it at the end of it's life?
I guess that depends on how old (or more "how used" ) and what it would cost to replace
Why not try the ice pack? If it does make it worse it's made the decision for you!
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alfiebeard
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| posted on 10/3/13 at 10:47 PM |
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Sorry kid the screens knackered, we see this every day at work (Tv Engineer) its failing cells in the screen itself, we have (in the early days) tried
to repair it by stripping the sceen out and separating the defuser panels and checking whether it was the backlight tubes that had gone dim in areas,
one in about 20 was caused by this, but to be honest you will be wasting your time trying to make it better, if it had been a Plasma set then some of
the posts above could have helped like putting the set on full white for a couple of hrs, this is called whitewashing, the fault you have is called
watermarking because when a picture is on it looks like it is water stained.
Hope this helps
Alfie
Old bloke on a mission with 320BHP of help
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