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My Uncle runs an investment banking company that uses 8 of these NEC LCD displays to display a perpetual presentation (by Rise Softools) that includes a company logo, bond prices, stock ticker and a TV. These screens are about 8 months old and we are not only getting 'image persistance' but also weird "shadows" on ALL of the screens. They initially looks kind of like tiger stripes but they are progressing to blotchy patches. I have called NEC and have tried an ALL white screen and also an 'Off' screen to try and reverse the effects, but to no avail. Any suggestions?! TIA



Here are an example of a couple of the screens. Thank you again!


Screen #3
http://www.aerodramatics.com/crews12.jpg


Screen#8
http://www.aerodramatics.com/crews22.jpg


Screen #8 Again w/ color enhancement...brings out the 'burn-in'!
http://www.aerodramatics.com/crews32.jpg
 

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please give the model number of the NEC?


They are LCD's or plasmas?
 

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NEC LCD4000 and they are LCD not plasma. It was suggested by a person that because they are angled downward that their weight could be causing the LCD matrix to flex slightly causing those patterns...is that possible??!?!
 

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well I am thinking it is a backlight issue?


some of the backlights may have failed causing the unevenness; particularly on screen #3?


or...


the mounting arrangement could cause misalignment of the case causing the backlight issue


and burn-in is quite evident


if they are 8 months old they are under warranty?
 

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What type of video cards are being used to drive the panels? I have an ATI 9500 video card that was manufactered about two years ago that produces similar banding affects on my 15" NEC LCD monitor. The banding problem also affected the 9700 series cards built in the same time frame. Check your cables and connections.
 

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please let us know what you find out:


I see what may be multiple problems: banding, backlight issues, source or cabling issues, burn-in (image retention) etc


However I noticed the image retention was only on part of the screen so something else may be going on here: it may all be source related
 
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