White screen on television/no picture - Televison & Video

White screen on TV means that no digital signal is coming from:
1: inputs or
2: TV signal

Generally the problem comes from the wires on the back of the LCD/LED is disconnected. But can also mean the the digital output board has failed or is damaged. If you cannot get the digital setup menu on the screen you will have to have the board replaced at a shop. One thing you can try is to Plug in TV while holding the power button. Sometimes that will do a factory reset. You did not indicate Brand or Model and cannot provide any more tips.