Hello,
First check if your televisions screen saver is not on, then check if you do not have your television on some settings that could cause such. Once you have verified that, then it means it is a hardware problem.
The causes of such problems are either bad lamp or faulty t-com board. The solution to the problem is for you to have the the television opened, assess the lamp and t-com board and replace which ever is faulty.
Take care and good luck
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