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  1. #1
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    Apr 2013
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    Amp probe turns off tv?

    Ok so I bought a new field piece the other day and don't ask me why but I was farting around with it and clipped the amp probe around the power cord for the tv and the tv instantly turned off, as soon as I removed it the tv restarted. I tried it three times and all three times the same thing. Can anyone explain this as all my co workers are baffled?

  2. #2
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    I have No idea??? But I'm interested in the why if anyone can come up with one.

  3. #3
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    You changed the circuit reactance when you put the jaws around the line.

    In the 1990's, TV makers had gone to solid state power supplies and single board construction. In fact, repair of discreet components was rarely worthwhile. A typical Zenith (made in Mexico then) failure would mean a new board.

    These solid state TV's use a sequence of operation involving three of four IC's, and they can be pretty finicky. The RCA tech booklet devoted an entire page of description to explain the steps the TV uses once the little pushbutton (or the remote) is pressed to get to the point of energizing the HV drive and the various amps and such, which when it is all over, results in the set being "on."

    By changing the reactance of the line, you upset the delicate balance required to maintain that state of well being.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  4. #4
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    Wow that's interesting. Not that I'm gonna do it again but do you know if its bad for the tv?

  5. #5
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    I think you have a ghost in your house.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  6. #6
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    Quote Originally Posted by thirdcoast361 View Post
    Wow that's interesting. Not that I'm gonna do it again but do you know if its bad for the tv?
    Bad?

    Probably not.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  7. #7
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    Quote Originally Posted by 2sac View Post
    I think you have a ghost in your house.
    Thanks now I won't be able to sleep tonight!

  8. #8
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    LCD, LED, Plasma, or old school TV? The power supplies in some newer TV's have built in "surge protection", but I'm not sure why a clamp on ammeter would trigger it. If you want to know the power draw of your TV get a "kill-a-watt" plug in meter.

  9. #9
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    Quote Originally Posted by timebuilder View Post
    you upset the delicate balance required to maintain that state of well being.
    Yep. Tell her you're sorry, you love her and it it won't happen again.

  10. #10
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    Nov 2008
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    Even if the tv didn't shut down it would have read zero, you have to be on only one wire, either the nutral or the hot.

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