Question Hdmi Sparks and Shocks

Discussion in 'Computer Components' started by Nooters717, May 20, 2018.

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    1. Nooters717

      Nooters717
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      Recently bought a 4K TV and when the HDMI cable is plugged into the TV first, if i go to plug the other end of the HDMI into my PC it sparks and causes electric shocks and also restarts the PC but if it's plugged into my PC first then the TV it's all fine... any ideas? I've tried two HDMI cables and it's the same situation with them both. Is it the new 4K TV or my PC?
       
    2. mkohman

      mkohman
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      Neither, it's you [emoji23].. You should never hot plug HDMI cables period.. In other words you should ensure your devices are off before any plugging or unplugging..
       
    3. Nooters717

      Nooters717
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      Even when the PC and TV is off it still occurs...?
       
    4. mkohman

      mkohman
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      Hmmm.. That I am not sure.. It shouldn't but I'm sure someone else will give you the correct advice shortly [emoji106]
       
    5. kinggo

      kinggo
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      by design, HDMI does have hot plug detection pin
       
    6. mkohman

      mkohman
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      It's not recommended... It can cause serious problems with electrical equipment...

      "Never connect and disconnect HDMI cables and equipment while your devices are powered on (hot plugging cables). The hdmi cables carries a low DC voltage while connected. You will damage your equipment and the HDMI Distribution equipment while hot-plugging cables which will not be replaced under the manufacturers warranty. Only use the Switched Mode Power supply supplied with the HDMI Equipment since replacing the power adapter might damage your equipment if incorrect voltage is supplied to the equipment."
       
    7. Nooters717

      Nooters717
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      I've done numerous tests etc to try and narrow it down and the HDMI also sparks when i try my TV to PS4... what's wrong with the TV then? What do you suggest i do?
       
    8. Greg Hook

      Greg Hook
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      Are all devices switched off at the wall?
       
    9. Nooters717

      Nooters717
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      Nope, they were on as that's what i use to do with my old TV without problems, i know it's bad now though. But i did unplug the TV from the wall today and then try to plug in the HDMI to the PC and it sparked. I then realised the HDMI was still in the TV even though it was unplugged from the wall but i then removed the HDMI from the TV then plugged it into the PC and there was no sparks. I will probably just learn to ignore it and buy some switchers or splitters or something for the HDMI's.
       
    10. kinggo

      kinggo
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      well, the fact that HDMI as standard is a mess since every OEM can do whatever they want when it comes to CEC does not change a fact that by desing HDMI can be hot unplugged/plugged. It's not that much different thany any other copper connection, they all have some low DC voltage. What else would be going through them if not current.
       
    11. andy1249

      andy1249
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      Much like USB HDMI has a hot plug feature.
      Also like USB it does not work very well and it can and does crash/damage equipment.

      USB went some way towards dealing with the issue by introducing a “safely remove” feature.
      HDMI has no such feature.

      You should never hotplug HDMI equipment.
      All devices should be completely removed from power while making or breaking connections.
      Not in standby, completely removed from a power source.

      Otherwise you are playing russian roulette with your equipment , one day you will hotplug and find that none of your HDMI ports will work any more because the HDMI chipset has been fried by an ESD/EOS event.

      If you are seeing sparks, this is a combination of ESD and EOS.
      ESD is electro static discharge from the body.
      EOS is electrical over stress from HDMI 5v line not dealing with the sudden make or break in connection.

      Note that even in standby the HDMI 5v line is always active. Its primary purpose is to power the EDID in the sink or display , so even if the display is completely removed from power its still getting 5v from the source via HDMI.
      So all HDMI devices in the chain must be completely removed from power while making breaking connections to avoid damage.
       
      Last edited: May 24, 2018
    12. Joe Fernand

      Joe Fernand
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      You may find too that your device(s) are trying to 'earth' via the shield on the HDMI cable (do your devices have an earth pin on the respective Mains Plugs?) so even where you 'get away with ' Hot Plug Detect' on the HDMI line you can still fry gear.

      Joe
       
    13. EndlessWaves

      EndlessWaves
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      Safely remove is primarily to prevent files being corrupted on mass storage devices disconnecting in the middle of a write. It's not offered on most other USB devices so I don't think it's got anything to do with hot plugging.


      But back on topic, this does sound like an fault with your TV. I would take it back and get it replaced.
       
    14. andy1249

      andy1249
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      Safely remove is there to ensure the port is inactive before hotplugging , simple as that.
      It protects both hardware and software.

      Sparks whilst hotplugging are very common with HDMI and do not indicate a fault.
      As pretty much every manual out there will say, dont hotplug HDMI.
       
    15. Mallardo

      Mallardo
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      This is interesting. I often swap 2 hdmi cables in my Blu ray player, to switch between a projector and a TV. I always make sure they are on standby but I never unplug them from the mains. I didn't realize this was a risk.
       
    16. andy1249

      andy1249
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      The best thing to do there is to get a good HDMI switch.
      Connect both up to the switch outputs and select whichever is needed.
      Good switches are cheap enough and will protect your player and Displays.
       
    17. Mallardo

      Mallardo
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      I would do that but it is just a temporary set up while I decorate the living room, so I am reluctant to spend any cash. I will make a mental note to switch off at the plug before swapping from now on though!
       
    18. stevelup

      stevelup
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      This is good advice but watch out though because the vast majority of HDMI switches are unidirectional and are almost always 'n' in to one out. Make sure you look for one that explicitly states that it is bidirectional or is a one in to 'n' out.
       

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