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Samsung 65-inch 2160P TV. Released in 2015.

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no picture or sound, backlight comes on then goes off

Led lights flash but when I unplugged the main board they stop and the back lights will come on but there is no picture or sound. As soon as I plug the main board in the back lights start flashing, they come on then get dim then off and keep doing it. The TV model is a Samsung un65nu6900 4k

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Hi,

If the backlights stay on when the mainboard - power board cable is disconnected at the power board end, check that the voltages on the power board cable connector where the mainboard cable was connected are as printed on the power board near the connector.

If they are then chances are that the problem is in the mainboard.

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