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Current leak from new led tv.

  • 01-05-2018 4:31pm
    #1
    niallam
    Registered Users, Registered Users 2 Posts: 699 ✭✭✭


    New tv arrived, plugged it in and turned the power on. Went to plug in a hdmi lead from my android box and could feel a static buzz from the tv when I run my fingers across any metal bits.
    It has a metal bezel and frame.
    Plugged in android box and static feeling got stronger.
    Turned off power to tv and still static feeling, coming through hdmi lead from android box. Turned off the box power and no more static.

    Neither tv or android box have earthed leads.

    I got some speaker wire and earthed it in a plug and tipped it off the tv and static went away.

    Plugged in my laptop to the wall, connected to tv by hdmi and no static as laptop lead is earthed. Plugged out laptop power and static returns.

    So basically, should I be worried?
    The devices I’ll be connecting to tv will not be earthed so static will always be there and worse the more hdmi leads I plug in, I don’t have any earthed devices.

    Last tv had a 3 pin connection to it so didn’t have the issue.

    This is second tv with this issue, supplier was really fast as sending a replacement to first one but this has exact same issue.

    Is it normal?


Comments

  • #2
    whizbang
    Registered Users, Registered Users 2 Posts: 1,974 ✭✭✭whizbang


    Its pretty normal these days!

    The issue is with the switching power supplies used, and 2pin supplies. Due to very close coupling internally, the outputs have a tendency to float to a high common voltage (which could be up to 325v). With no earth wire, there is no way to pull this down, and with no proper way to determine live and neutral, it cant be tied to either of the mains wiring also.
    Usually there will be a divider between the live and neutral, with a capacitor (or high value resistor) to tie the output to this middle voltage (up to 110v).

    As its very low current, its regarded as safe! But don't hotplug anything expensive.


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