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post #1 of 3 Old 03-02-2020, 12:34 AM - Thread Starter
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High voltage on HDMI connector

Let me know if this is the right section to post. I am new to the forums.

So I had an electrician come over and measure few things in the house because my LG OLED TV has suddenly broken (green line showing in middle of screen when turning on and then it turns itself off). The only thing that he found to be out of order was a measurement of 40 volt on the metal connector of the HDMI cable going from my Nintendo Switch to the TV. Is this a normal reading? And if not is this voltage something that could have fried something in the TV?
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post #2 of 3 Old 03-02-2020, 09:17 AM
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Originally Posted by FriedTV View Post
Let me know if this is the right section to post. I am new to the forums.

So I had an electrician come over and measure few things in the house because my LG OLED TV has suddenly broken (green line showing in middle of screen when turning on and then it turns itself off). The only thing that he found to be out of order was a measurement of 40 volt on the metal connector of the HDMI cable going from my Nintendo Switch to the TV. Is this a normal reading? And if not is this voltage something that could have fried something in the TV?

40v on the cable connector sounds really high to me. HDMI is designed for 5v/50mA power output at the ports so I'm not sure where the 40v came from. But yeah, that could damage an HDMI input. Did you have a power outage? Maybe the switch faulted out and has lost ground? Did he disconnect the cable and test the switch?
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post #3 of 3 Old 03-03-2020, 02:30 AM
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The 40v will be on the outer earth shield as the Source is double insulted and looking to earth via the next device along the signal path - one issue you can get with a lot of modern kit is that all of your devices are double insulated and there is no 'ground' in the system.

It is always good practice to not connect or disconnect HDMI devices when your devices are powered On.

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