My Samsung tv, model code: UN55MU700DFXZA refuses to turn on. The remote seems to be working and has new batteries, it blinks red when you press the “on” button but nothing happens. Nothing on the tv blinks and there is no change. Please help! It’s been like this for a couple of weeks now, and nothing I’ve done so far has worked.
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Hi @mabbypelle
Have you tried using the TV controls located on the bottom edge on the right side of the TV, to see if it turns on or not? I’m not quite sure if you had or not.
If it doesn’t turn on either when using the TV control button then try the following:
If you decide to try the following, be safety aware when testing on the power board as there is exposed lethal AC voltage on the board when the power is connected. If you don’t know how to do this, contact a reputable, professional TV repair service and ask for a quote.
Disconnect everything from the TV including the power.
Remove the back cover and then disconnect the cable between the mainboard and the power board.
Reconnect the power to the TV.
The screen’s LED backlights should turn on and stay on. There will be no pictures because the mainboard is disconnected.
If the backlights stay on measure the voltages on the power board at the connector where the mainboard cable was connected to. Their values should be marked on the board near the connector. If the voltages are OK it may be a mainboard problem or a mainboard-powerboard cable problem. Use an Ohmmeter to test each wire in the cable for continuity to eliminate it as a possibility. Do this with the cable out of circuit
If the backlights blink or don’t turn on then there is a problem either in the backlights or in the power board.
Measure the voltage between the LED +ve leads and earth on the power board. If the voltage is >230V DC the problem is in the LED array or the connection to the array from the power board. If the voltage is <50V DC it is most likely in the power board.
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