U replaced the tv power supply board,the board u replaced,that is the board where the power a/c cord plug into it?Check ur old power supply board,examines all parts,see if u have any capactors parts are bulging or puffing up on it tops.Yes,than it is power supply board issue.But by replacing the power supply board only get 50/50 chances for the tv to work.Might be the problems,might not be the power supply board issue alone some times.The chances are tv Tuner signal board is dead also.That the board,where the tv incomming broadcasting signal cable plug into it.Try website like Ebay.com to buy a refurbish tv Tuner signal board for the replacement.
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