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If you mean the cable connector is broken off, then yes, that can be replaced. A company called MCM Electronics sells replacement connectors, but the repair requires soldering skills. Incorrectly done, the repair attempt can create even more problems. I suspect your satellite receiver has A/V outputs like the DVD player. Why not connect the receiver the same way as the DVD player and forget about the cable connection? You'll get improved picture and sound that way. If the set has only a single set of A/V inputs, you can cheat and use "Y-adapters" available at Radio Shack to connect the two sources to the same jacks, or you can get an A/V switch to do it.
There are probably some failing components in the uPC control area, or with the keypad board on the TV sets front panel. It is also possible that there is a problem with the filtering of the distributed power through the circuit boards of the set, and there is some noise causing a false trigger of the function.
This type of fault can take some time for the tech to figure out, unless it is a published common fault with the particular model of set where they give a list of parts to change.