Question about Sony KDF-E50A10 50 in. LCD HDTV

2 Answers

Sony KDF-E50A10 case has 60 volts to ground !!

Got bit fooling around with the cable tv wiring. After some checking I discovered that my Sony TV has voltage from the cable tv connector to ac supply ground and it measures 60 volts ac. This may have existed from day one. TV is two years old and works perfectly however this needs to be corrected. Anyone seen this problem ? I checked the outlets and they are wired correctly and I even tried a different outlet on another circuit. Same problem.

Thanks

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  • ringram2077 Mar 07, 2008

    I am measuring 60 approx 60 volts ac from the coax shield (outside) to ac ground. It you touch the shield side and the shield on the cable wire you will get bit (when the cable is disconnected). I measured ac milliamps at a very small value, only .27 ma between the cable coax jack outer and ac ground on the power strip. Of course the cable shield is also connected at the outside cable entry to the same ac ground system, hence why it will bit you.

  • ringram2077 Mar 07, 2008

    Let me be clear that I am measuring the 60 volts from the cable connector outside thread on the back of the tv to ac ground.

  • ringram2077 Mar 07, 2008

    The TV has a two prong polarized plug. The power strip accepts three prong plugs as well as twp prong and the neutral slot is larger than the line slot. So it looks like the power setup is correct. Oh yes, I checked the outlet with a tester to see if it was wired correctly and it is correct. I checked to see if there is a connection between chassis ground (threaded part of the cable connection jack) and the neutral prong of the ac power cable and there does not appear to be a connection at least using the continuity function on the DVM.

  • ringram2077 Mar 07, 2008

    As a test I connected a 220K resistor between the cable connector thread and ac ground. I then measures the voltage on the thread and it dropped on a few volts. I then connected a 10K resistor and the voltage dropped to 2.9 vac. I suppose I could use this method although the isolation transformer might be safer. I don't think you could get hurt with the voltage because the current is small. This is not a normal condition for a TV like this is it ? If nor how do you suppose it got in this condition ?

    Richard

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  • Master
  • 6,966 Answers

Hi,

If I may confirm, you are measuring 60ACV from the center terminal of the ANT/CABLE connector at the rear of the TV unit to the neutral/gnd of your mains? It is not from the center conductor of the incoming coaxial cable from your cable provider.

Pls post back and will take it from there.

Kind regards.

Posted on Mar 07, 2008

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  • Louie  Role
    Louie Role Mar 07, 2008

    Hi ringram2077 and ginko,

    It would be possible if measured at the incoming coaxial cable since cable company powers their inline amps through the coax itself (36~48V). There would be some sort of isolation before coming into the subscribers residence but if this is the case, then it is the providers concern. It is possible that the feeder/splitter/distribution amp would require replacement.

    If at the rear of the TV itself (center terminal of ANT/CABLE), then this could only be residual voltage stored at one of the in line capacitors along the RF line input. Most TV RF INputs is actually a RLC circuit and what ringram2077 is measuring is the stored voltage in one of the capacitors.

    Past dealings with some models have shown that there is a mild/slight shock if touch (specially when splitting to several other TV units) but quickly dissipates since the current is very very low.

    A workaround is to use a resistor (100K 0.5W) load parallel to the center terminal to ground. This would ground any potential difference and prevent any other shocks or voltage reading.

    The reading would normally be high when using a DVM but would be very low when using an analog Voltmeter.

    Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

    Good luck and kind regards.

    Thank you for using FixYa.

  • Louie  Role
    Louie Role Mar 07, 2008

    Appreciate the postback and the updated information.

    Voltage presence from the cable connector outside thread to the AC ground is to be expected. The threaded portion is part of the tuner input circuitry. It is chassis grounded to the TV set. However, your AC mains is earth grounded. From your mains the AC power goes to the power supply but is isolated from the internal chassis ground of the TV since it is a switch mode type. So basically you have two (2) types of ground, one internal to the chassis of the TV and the AC mains earth ground. There would be a voltage difference between the two grounds. In most designs, there is a grounding resistor (500k~1M) from the TV's chassis ground to the AC mains earth ground to dissipate this potential difference. This is also the reason why the AC plugs have different sizes/shapes of prongs so that the neutral/earth ground is always neutral/earth ground.

    If you are using a power strip, does it also uses the uneven prong AC plug to maintain which is neutral/earth ground? If not, can you please try reversing the way the plug of the power strip is attached to the wall outlet? And thereafter pls try measuring again.


  • Louie  Role
    Louie Role Mar 07, 2008

    since there was no connection/resistance (even in high range) between the TV's chassis ground and the cord's neutral, then there would be a voltage difference as detected by the DVM. You may want to try to open the TV and look for the power supply board (normally all by itself off to one side) and try winging it from there. You would be looking for a resistor that is connected to the AC cord's neutral to the chassis ground (usually on the secondary/load side of the high freq. transformer of the SMPS). You can also try hard wiring a 1 Mega Ohm resistor between those two points. If you are not comfortable with either, then perhaps you can try using a 1:1 isolation transformer between the TV and the power strip.

  • Louie  Role
    Louie Role Mar 08, 2008

    re - connected a 10K resistor, either that and/or a 0.22uF/275V considering that the voltage is an AC.

    This is not a normal condition for a TV like this is it ? - Unfortunately, yes due to the differences in how the mains are distributed to the residences and the TV manufactures has to make allowances/concessions to accommodate these variations. As an example, in my country there are 2 ways grounding is achieved: 1) line to line is 220, line to ground is 110 and 2) the other is line to ground is 220 as in you case, 110 line to earth ground.

    If not how do you suppose it got in this condition ? - In some very rare instances it is the internal (PSU) resistor/capacitor from TV chassis GND to line neutral/earth GND that opens hence magnifying the voltage difference.

    Offhand, I would still reco the 1:1 isolation transformer as being the safest rather than modifying with a resistor/capacitor.

    Cheers.

  • Louie  Role
    Louie Role Mar 08, 2008

    Glad to be of assistance and appreciate the rating too.

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  • Sony Master
  • 19,396 Answers

I do not know if I understood your prob, you have 60v in tv cable, and you do suspect is short from from AC, is this what you mean?

Also where are you located?

Posted on Mar 07, 2008

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