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The model UA40F5500AM is a 40-inch smart television produced by Samsung.

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Why is power button not turning on the yv

Holding power button down makes light flicker but won't turn on TV.

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@dave9061 you are not telling us if the power LED is on or off with the TV being plugged in. If the power LED is on, you know the power board supplies at least standby voltages to the main board. For now you want to try to unplug everything that is plugged in the back of your TV. unplug the TV and push the power button for about one minute, then plug it back in. See if that resets your TV.

After that it's time to remove the back cover. Remove the power cord and remove the back cover. Next remove the connector from the main board to the power board. Plug the power cable in. The back lights should come on. You can see those through the numerous holes in the back of the panel. If the back lights come on, your power boar is almost guaranteed to work, Now unplug your power cord, plug the main board back in. Try to turn it on. If it still doesn't turn on, measure the voltages on the power board to main board connector. Let us know what voltages you get.

We need to know the exact model of your Samsung TV. It will also help if we can see the boards. Post some good pictures of all of them with your question 在已经存在的问题里加入图片

Until proven otherwise, for now it is possible that this is either a power button issue or a bad main board.

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