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Why HDMI is not working on my Samsung smart tv?

Why HDMI is not working on my Samsung smart tv?

When I try to connect devices to my UA55F7500BR Samsung smart tv, it doesn't work. Cables are good.

ANSWERS:

Check that the cables are connected to the output ports of the source and also connected to the input source of the TV. If that is connected properly, next make sure the 'input' of the TV is selected to your output source (bluray, component, AV, etc.). If you're still not getting a signal, see if a factory reset will fix it. Worse case scenario, you might have a defective main board and need to replace it.

it will not light up

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