Chosen Solution

I’ve tried power cycling. Unplugging power cord from tv, nothing. No response from buttons. Model number: E550i-B2

This model has a known problem with poor solder joints on the connector that goes to the inverter board. If you open up the back and have the power board on your left, the connector will be in the upper right side of the power board going to the board on the right of the power board. Try removing this power board and soldering the connections as described. Update this with the results. If this does not resolve it, further instructions will follow. Dan

VIZO P702ui-B3 If off for more then a few hours the led (lowed left corner) lights. but no picture. If power cycled 2 or 3 time it turns on normally. Power board or main? Where can I get them?