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Re: mark on creen like a wisp of smoke 8 inch long 8...
Hello, and thank you for choosing FixYa! This could be a smudge, or dust on the color wheel. The area around the lamp needs to be "dusted" Buy a can of compresed air and blow all of the components near the lamp out. You will have to pull the back of the set off to do this. While you are in there you may as well go ahead and blow off the rest of the componenets. Good Luck! If this was usefull, please take a moment and rate this solution!
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Faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent.
Probably the power supply that drives the video has gone bad. Samsung recommends the TV go to a service center. If you have some skill and are willing to try, open up the back of the TV, remove the shielding and look at the boards to identify any obvious damage. Leaking or bulging capacitors, soot, scorch marks are the obvious. (Other parts can have bad solder or tiny cracks that are hard to spot.)
http://www.shopjimmy.com/catalogsearch/result/index/q/HP-R4252 has reclaimed parts for this TV. These are parts from TVs that were damaged in shipping and were only run during quality control tests. They list several power supplies for the model so check what part number is actually installed (there is usually a label on the board).
You have a burn in problem from watching widescreen movies.If you have access to a signal generator or tv setup disc run a perfectly white screen on the plasma for about 30 min.This should help even out the pixels on the display.
I have just completed removing tha base from a Toshiba 52 inch HDTV. There are 5 screws in total. Three about 8 inches form the base and another 2 about 4 inches from the base in the arrangement shown below
(X) is a screw
(l) center line
X X X 3 screws 8 inches from base
X l X 2 screws 4 inches from base
______l______ The base
Keep your feet clear as your undoing the last screw..the base slides out vertically downward and weighs about 10-15 pounds so keep your the toes, fingers etc safe. The risk of being sued may explain why Toshiba didn't this publish in the US manual.