I have not worked on your model.
My answer will be generic. It is possible that there is an option in the user menu that must be turned on to allow PIP. You must also make sure that there is an external feed going in to allow the PIP to reference to something.
Consult the user manual for details. You can also call the RCA tech support for your TV set.
It is possible that the PIP circuit area has a failure. But, this is not very often.
Jerry G.
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