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Cannot turn on my LG TV

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Hi,

I cannot turn on my TV. I press the power button and it flash for three or four time and nothing happen.

I unplugged the power cord over night and tried it again and same problem.

I disconnected all the cable and turn back on and I still have issue,

Anybody has any idea on how to fix it?

My TV model number is LG 50UH5500.

Thanks.

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