[rverdlm]

The hot water heater should not increase the pressure in the cold line. There is a check valve on the cold side of the water heater and I think that yours is leaking through. The TV no doubt has a bad cable. The TV will come out, but I don't know your setup. On mine there are 2 screws into the bottom that are accessed by removing the drawers under the TV. There are many cables and you'll need to check them all.