Id this resistor please

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  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA

    #1

    Id this resistor please

    Trying to ID this resistor not having much luck any help would be appreciated. Thanks
    Attached Files
  • goontron
    5000!
    • Dec 2011
    • 4108
    • US

    #2
    Re: Id this resistor please

    * Inductor
    Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

    "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

    Excuse me while i do something dangerous


    You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

    Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

    Follow the white rabbit.

    Comment

    • eccerr0r
      Solder Sloth
      • Nov 2012
      • 8695
      • USA

      #3
      Re: Id this resistor please

      Picture of board would be interesting.

      Color code is weird possibly indicating inductor, but usually inductors are green...

      Comment

      • jiroy
        Badcaps Legend
        • Jun 2016
        • 2416
        • Lebanon

        #4
        Re: Id this resistor please

        How to calculate inductors :

        http://www.learnabout-electronics.or...nductors04.php

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Id this resistor please

          Can we see the good clear straight shot pictures of the whole top and bottom side of the board?
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • landyboy
            Badcaps Veteran
            • Apr 2013
            • 443
            • USA

            #6
            Re: Id this resistor please

            I will get some pics of the board today. Its from a Vizio 42". I can tell you it is marked R808D on the board.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Id this resistor please

              Originally posted by landyboy
              I will get some pics of the board today. Its from a Vizio 42". I can tell you it is marked R808D on the board.
              So it is resistor, cannot tel what its function is until I get to see the good clear picture of the board.
              VIZIO model ??????
              Board P/N???????
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • landyboy
                Badcaps Veteran
                • Apr 2013
                • 443
                • USA

                #8
                Re: Id this resistor please

                Here you go...just a little background. while replacing the cap next to this resistor I damaged the resistor now requiring to replace it as well.
                Attached Files

                Comment

                • R_J
                  Badcaps Legend
                  • Jun 2012
                  • 9535
                  • Canada

                  #9
                  Re: Id this resistor please

                  The resistor does look a bit damaged but the value might still be ok, try and measure it.
                  The damage was not caused by circuit failure and seems to be in series with R808A, B, & C from the main cap to the ic802
                  Also knowing what the number is on ic802 might also help
                  Last edited by R_J; 05-30-2018, 11:37 AM.

                  Comment

                  • eccerr0r
                    Solder Sloth
                    • Nov 2012
                    • 8695
                    • USA

                    #10
                    Re: Id this resistor please

                    These are all GUESSES:
                    Guessed value is: 499KΞ© β…›W (yellow white white orange red?)
                    Guessed purpose for resistor: startup resistor for off-line SMPS
                    Guessed criticality of resistor value: fairly low

                    And agreed, that resistor may still be good, measure its resistance. As it's mechanical failure, it should fail open...

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada

                      #11
                      Re: Id this resistor please

                      I would agree 499K, there are 2 other resistors in series, R808A=1meg, R808B=1meg & R808C=499K.
                      I suspect R808C and R808D combined would = 1meg but instead of another surface mount 1meg and a jumper wire, they used 499k a regular 499k resistor to jump across the other traces

                      Comment

                      • landyboy
                        Badcaps Veteran
                        • Apr 2013
                        • 443
                        • USA

                        #12
                        Re: Id this resistor please

                        I must be colorblind lol. I see Blk,Silver,Gray,Brown,Violet.

                        Comment

                        • landyboy
                          Badcaps Veteran
                          • Apr 2013
                          • 443
                          • USA

                          #13
                          Re: Id this resistor please

                          I tested the resistor and I am reading 503 on the 2000K setting.

                          Comment

                          • eccerr0r
                            Solder Sloth
                            • Nov 2012
                            • 8695
                            • USA

                            #14
                            Re: Id this resistor please

                            Nah, the colors have faded due to some heating it seems. We weren't really using color, but judgement from seeing many similar designs.

                            Anyway, 503KΞ© is within 1% of 499KΞ©, so I think just reinstall that resistor.

                            At the worst the power supply is dead and you know which resistor is bad...

                            Comment

                            • landyboy
                              Badcaps Veteran
                              • Apr 2013
                              • 443
                              • USA

                              #15
                              Re: Id this resistor please

                              Before I removed the small resistor I tried that. First replacing the large cap right beside it. The set would come on and work a while then shut off and the old cap was bulged badly. But as I said I thought I damaged that resistor but did leave it in place at first and the set would not even power up. So I made an assumption that it was bad. Ugg

                              Comment

                              • Techgeeky
                                Member
                                • Oct 2017
                                • 15
                                • Turkey

                                #16
                                Re: Id this resistor please

                                Originally posted by landyboy
                                Trying to ID this resistor not having much luck any help would be appreciated. Thanks
                                That one looks like an inductor. That one having a thick body from ends and slim body from the center.

                                Comment

                                • eccerr0r
                                  Solder Sloth
                                  • Nov 2012
                                  • 8695
                                  • USA

                                  #17
                                  Re: Id this resistor please

                                  It'd be a strange inductor since it has an R808D component designator...

                                  As R_J suggested, get us the part number of the IC (IC802) that it's connected to... then might be able to reverse engineer the value...

                                  ... or if someone somehow finds the schematic...

                                  Comment

                                  • R_J
                                    Badcaps Legend
                                    • Jun 2012
                                    • 9535
                                    • Canada

                                    #18
                                    Re: Id this resistor please

                                    When you were replacing that cap, and damaged the resistor, Did you remove the 2 screws from the heatsink and bend it back to access the cap, by chance... If you did check the legs on the fet's to make sure they are not broken

                                    Have you ever measured the voltage on the cap ? to see if you at least have 160v or 400v if the pfc is working
                                    Last edited by R_J; 06-02-2018, 08:31 PM.

                                    Comment

                                    • Sparkey55
                                      Badcaps Legend
                                      • Jan 2010
                                      • 1523
                                      • USA

                                      #19
                                      Re: Id this resistor please

                                      Originally posted by eccerr0r
                                      It'd be a strange inductor since it has an R808D component designator...

                                      As R_J suggested, get us the part number of the IC (IC802) that it's connected to... then might be able to reverse engineer the value...

                                      ... or if someone somehow finds the schematic...
                                      In the old, old days Inductors were often called Reluctors. Because coils were "reluctant" to pass a.c. as opposed to condensors that allowed a.c. to pass more freely.

                                      Comment

                                      • landyboy
                                        Badcaps Veteran
                                        • Apr 2013
                                        • 443
                                        • USA

                                        #20
                                        Re: Id this resistor please

                                        RJ I did not, I worked it without moving the heatsink. I did get a replacement 499k Res and replaced it. Same thing will not turn on. I must have done something. Like I said it would turn on before I did anything but then shut of and that cap was badly bulged.

                                        Comment

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