Usually power supply problem.If you want to open it yourself,then(unplug the unit first) unscrew the backpanel,get a clear two inch wide packaging tape.As you remove the screw tape it to where you got it so as not to loose them and know where they belong.Usually the power chord is connected to the power supply board.Observe any capacitors after the transformer(hot side do of the board)which have bulged top(usually 680 to 880nf/35 volts)but try to see the values cause they differ in brands,replace them with the same values.
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