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SMD Resistor (Stumped)

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    #1

    SMD Resistor (Stumped)

    Hello,
    I have an odd resistor that I cannot seem to figure out.

    This is a logic buffer from a Panasonic Plasma. I shorted the resistors out when I dropped a screw that grounded out the board and now causes a black strip in the screen. I know I could replace the board but I would rather save a few bucks and try to replace the resistors.

    I have never seen this resistor with a negative ( - ) symbol on a resistor and cannot find any information about it on the web. Does this negative mark change the value or should I just treat this as a 6.8 ohm resistor.

    I hope someone will be able to shine the light on this -6R8 resistor

    Thanks
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    #2
    Re: SMD Resistor (Stumped)

    I would assume that to be 6.8

    what does it measure?

    Comment

      #3
      Re: SMD Resistor (Stumped)

      They are blown so it measured nothing. The same resistors next to these on a different channel measured 4.1 ohm.
      I suppose that is my answer but I still have never seen them with this symbol and would like to know what it means.
      Last edited by DavidDunn; 12-13-2012, 11:47 PM.

      Comment

        #4
        Re: SMD Resistor (Stumped)

        Safest route (as far as value measurement is concerned) would be to unsolder them from the board and measure them out-of-circuit.

        Looks to me like they're part of some RC filtering circuit (with that chunky 1210(?) cap to their right)...
        Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

        Comment

          #5
          Re: SMD Resistor (Stumped)

          I cant find anything relating to a minus sign before the 6R8 perhaps the manufacturer produces 3 digit code and 4 digit code resistors and HAS to print something when it is only 3 digit value? I would go for 6.8 ohms.
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

            #6
            Re: SMD Resistor (Stumped)

            Hate to bear bad news but if you've got a black bar it might not just be those resistors -- the panel driver may be fried (which is bonded to the plasma panel, so is unreplaceable.)
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

              #7
              Re: SMD Resistor (Stumped)

              I believe Selldoor has the correct answer. The "-" is just a place holder.

              Comment

                #8
                Re: SMD Resistor (Stumped)

                I may just treat it as a 6.8 Resistor. The idea of it just being an extra placeholder for a 4 digit code makes since.
                I do hope the panel is not bad but we will see. I will try to replace the resistor and if that doesn't work I will replace the board. If that doesn't work than I will know that I have ruined the panel

                Thanks for the advise guys.

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