It's blinks 5 times and nothing. Has no remote. What should I do

"Hi,

Try the following:

Disconnect the power from the TV and then remove the back cover from the TV

Disconnect the cable between the mainboard and the power board.

Reconnect the power to the TV.

The screen backlights should turn on full intensity and stay on. There will be no picture because the mainboard is disconnected.

If the backlights stay on, measure the voltage on the power board where the mainboard cable was connected. The voltage values are marked on the board near the connector. If all the voltages are as marked then most probably there is a problem with the mainboard.

Be careful when testing as there is exposed lethal AC voltage on the power board near to where you’re testing. If you don’t know how to test safely when AC voltage is present, then don’t do it! Contact a TV repair service and ask for a quote.

If the backlights don’t come on, most likely there is a problem with the power board or the LED backlights or both."