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Sorry you are having trouble here.
I will need the model number please found on the back of the set?
Have you had any issues trying to get the set to come on?perhaps its been slow coming on?
The thing with mounting on the wall the set "bends" so if there is anything not tied down on the power or main boards there may be a problem, the set will need to come down again I am afraid and the power and main boards examined with the back of the set off