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It isn't dangerous to have a DC voltage on a co-ax input to a television but there is a small risk that it may damage the input. It certainly isn't regarded as good practice to allow DC voltages to reach inputs unless they are intended to deal with DC.
There are a variety of devices such as signal amplifiers that can be fitted close to an aerial and powered by a power supply at the other end of the co-ax cable. In these cases, a DC voltage is applied to the cable but is not allowed to pass further down the co-ax cable to the television itself. If the cable is disconnected from the television, in some cases, the DC voltage can be measured but this is normally just some leakage from the DC filter in the power supply. Once connected to a television input, the voltage will normally disappear.
If there is still a concern, talk to a qualified TV service engineer who will be able to identify the source of the 12V.
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