I have a GFI outlet on a covered deck where I have a TV hooked up. I've never had a problem. Just in the last few days the TV wouldn't work. It's not the TV because it powers up on other outlets in the house. The GFI has power coming to it because I tested it with a voltage detector. Thinking it was a worn out GFI, I replaced it with an identical GFI being very careful that wires are hooked up correctly. Same thing is happending. Electrical appliance will not work on the outlet but my voltage detector says there is power. HELP!