LCD vertical pink lines


Novice Member
i have a strange problem with my UA49KS8500 samsung TV
it's 4 years old
when i leave the TV not working for 2 or 3 days when i open it's full of vertical pink lines, till like 30 mins to 1 hour and then everything become ok and those lines disappear
and then completely disappear if i'm opening Tv everyday till i go for a vacation on weekend and TV left unopen, then when i try to open it the problem happen again
anybody can tell me what could be the problem


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