But it doesn’t turn on my tv

But it doesn’t turn on my tv

Hi there. I have a vizio E470-A0 flat screen tv. I tested the remote and see the light flashing thru my cell phone camera. But it doesn’t turn on my tv. I have to do it manually and the volume also has to be done manually. I can change the channels using cable box remote thru the cable box . Should I change the IR sensor. And if yes, what is the item #?

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