Chosen Solution
Hello I replaced my main board on my TV that I got for free. It’s a un50mu6070fxza. I replaced the main by the actual part number and to the “T”. When I unplugged the main board from the power supply, the back lights turn on. But once I plug it back on it turns off and I get nothing. Could this be a bad power board?
Hi @jbraun89 , Disconnect the power from the TV and then disconnect the mainboard cable from the power board at the power board end. Reconnect the power to the TV and then measure the voltages on the power board at the connector where the mainboard cable was connected. The voltage values should be printed on the board near the connector. If the voltage values are correct and since the backlights are also working it means that the power board is OK. Be safety aware when doing this as there is exposed lethal AC voltage on the power board near to where you’re testing.
