RCA XL-100 No Channels under 50

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MarsUltor
RCA XL-100 No Channels under 50

First of all,my expertise is in Oilfied electronics so don't expect much.

Anyhow, the Boss dropped off this TV at the shop. He says it doesn't receive any channels (cable) under 51. All I have around here is a VCR and yes nothing through channels 3 or 4.

I am guessing it is not the tuner but in the processor or built-in converter? 

Plus there is not a TV repair shop for fifty miles.

Anyone have any idea or even a schematic?

 

Thanks

 

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