I am plugging my TV into a grounded outlet. When I plug an HDMI cable into the back of the TV and measure the voltage coming out of the other end of the cable (should be 0 shouldn't it?) it reads 380 volts...
I'm talking to my landlord about this but this is absolutely not normal is it? If so, what could be causing this? It happens with other outlets as well.
PAST INFO: When the first Comcast guy came and tried to install the X1 box, he got a little shock while trying to connect the two. He told me that the outlet I was plugging them into was reversed wired. The landlord fixed this and I confirmed that he did with a plug in tester. After this, Comcast came back and tried to install it again, same sparking issue.
I had two TVs with this problem
- TV #1 (3 pronged) was in my bedroom and was plugged in, and hooked up to a Comcast Digital Receiver with an HDMI cord. Worked perfectly. When I moved it into my living room and tried it with the Comcast X1 HD box, it created sparks when I tried to connect the two with an HDMI. The Comcast technician verified that no foreign voltage was coming out of the box or the HDMI from the box. He also replaced the box and the box's power supply. So this happened with two comcast boxes Could it be the Comcast box?
- TV #2 (3 pronged) was always located in the living room and created sparks after I plugged in the Comcast X1 box (both of the boxes).
NEW INFO: The two TVs that had high voltage coming from the HDMI cord that was plugged into the back of them had one thing in common. The power cords for those TVs had a ground on them (3 prong). My landlord brought his TV over and tested it and it worked. His TV has 2 prongs. I just bought a new TV and had an electrician come and we tested it, it worked. My new TV has 2 prongs. Could the three prongs be a problem with something?
My landlord used a Digital Volt Meter and had it set to the vAC option when it read 300+.