In my expierience if it's random spots it's the fault in screen it self. If it's something external you get whole rows or columns messed up. Sometimes spots go away if you apply a pressure on the screen near it or if you apply bending pressure to it.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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