Ref trouble shooting the TV in living room. The first thing I would do is get a 50 feet piece of coax with connectors and run it from the bed room to the living room TV to make sure the TV works. I am sure it will. Then you can start disconnecting coax at the antenna power control and find which coax goes to the front TV. Then get a barrel and start in the area behind the tv. I would get new COAX connectors and replace the ones used by Keystone. Finally under the slide is an electrical box and close too it is the coax cables into the entertainment center. They should have a barrel splice to help with the trouble shooting. Again replace the connectors. I use the same type that EXNAVYDIVER uses which is the ones used by Direct TV.
Good luck
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