When I start my 40 inch samsung led tv, it shows red and green vertical lines and delay in picture like 30 to 45 mins. Sometimes it takes 2 hours. But sound ok. Only picture delay by 45 mins.
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@vedantbhaumik we really need to know the exact model number for your TV. This sounds like cold solder joints or failed Mosfet/capacitors on the main board. Remove the back cover from your TV and post some good pictures of your boards with your pictures. Of course, you have tried all the other video inputs to rule out a bad cable or sat box. Try a game console or DVD/BR player
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