Question Stain on lcd screen

Jan 29, 2022
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Hi,

I recently replaced the LED stripes of a 65’’ LG TV. After powering on I realized there is a kind of whitish stain( 2inches wide) which is visible only on dark backgrounds. Any ideea of what can it be and if possible to solve?

Thanks.
 
Jan 29, 2022
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10
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It is like an irregular stain( similar in shape to how a glue residue would look like when you peel off a piece of adhesive tape from a surface) made of light . Could it be some air between difusser layer? Or some residues that I left on the backside of the lcd panel or frontside of the diffuser? When i dismantled the 3 layers they moved a bit as it is very difficult to keep them togheter very tight because of the size.
 
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