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tried to connect again the supply for main board and disconnect the supply for the inverter board of back light. and turn on the tv, if the indicator stay the inventer board was the cause of voltage drop at the power supply board.
Nothing at all? Does the screen seem to go from dark black to a lighter shade of black?
If the screen appears to stay on the darker shade of black then it is broken, and needs to be sent for repair. ( ie the screen isnt powering on when the tv is and there is nothing you can do without opening it.
You might try unplugging all cables and leaving it off with no power for a day This is in effect performing a factory reset.
and this may sound stupid and patronizing but is the TV being taken out of standby mode and actually switched on?