TV screen half dark

I face the same situation once but not Samsung. However, the same issue as you are facing and finally the whole screen got dark and only sound. So, you had better take professional technical advice before the issue getting serious
 
I face the same situation once but not Samsung. However, the same issue as you are facing and finally the whole screen got dark and only sound. So, you had better take professional technical advice before the issue getting serious

Surprisingly no part of the screen is dark now but there is a feint border all the way around the screen.
 
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