How can I find the ir sensor model number without tearing tv apart?

How can I find the ir sensor model number without tearing tv apart? My Vizio TV Model D40-D1 sticks on one channel and the remote won’t work. This happens on only one (antenna access only) channel. Reset does not help. Possibly a faulty ir sensor. How do I find ir sensor model number without taking my tv apart? ANSWERS:
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