Having your TV coaxial cable run through an outlet cleans up your TV room. Instead of having wires sticking out of a hole in the wall and running along the floor, the outlet allows you to plug your coaxial cable in near your TV and conceal the cables more easily. If you find that you are not getting a cable feed through one of the outlets in your house, there are a few methods to troubleshoot the problem.
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Remove the faceplate of the outlet. Unscrew the two screws securing the plate to the wall and pull the faceplate off. Inspect the cable feeding into the back of the outlet. If the cable is loose or disconnected, the outlet will not work. If this is the case, re-attach or tighten the cable.
Check the source cables. The primary coaxial cable leading into the house is usually branched out to feed the outlets in your house. The cable is often fed from outside the house into the basement or crawlspace of your home and split using a cable splitter. Check the connections of all of the cables branching off of the primary cable. If one of the cables is disconnected, it may be the cable leading to the dead outlet.
Make sure you are subscribed to cable TV services. Just because you have coaxial cable outlets in your home, it doesn't necessarily mean that you will receive cable TV. A subscription is required to get services through your outlet.