Quick Resistor Question (Sharp LC-32D43U)

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  • saintlouis74
    Senior Member
    • Dec 2013
    • 102
    • USA

    #1

    Quick Resistor Question (Sharp LC-32D43U)

    I came across a Resistor that I can't identify, can anyone tell me the kind of resistor this is? and maybe a link to a replacement part... thanks



    Markings:

    6.8M Ohms
    M1WJ
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Quick Resistor Question (Sharp LC-32D43U)

    Is one leg of the resistor connected to the chassis and another leg connected to Neutral? This is a safety resistor with very high value and high breakdown voltage, it is not needed for the circuit to function. So what is the problem with the unit you are working on? Make and model?
    BTW, those small blue caps are also safety cap (X/Y type).
    Last edited by budm; 07-20-2014, 11:39 PM.
    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

    • saintlouis74
      Senior Member
      • Dec 2013
      • 102
      • USA

      #3
      Re: Quick Resistor Question (Sharp LC-32D43U)

      Its a Sharp LC-32D43, with no power at all, i havent fully diagnose it, just popped the back off checked the fuse, then the resistor i questioned about had no reading, so i stopped to figure why it didnt

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Quick Resistor Question (Sharp LC-32D43U)

        Post good clear pictures of the back side pf the TV and whole picture of this power supply board. There should be big main filter cap in the primary side of the circuit, it should have about 165~170VDC right at the two legs of the cap.
        Was the TV hit by the surge or it just went out by itself?
        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

        • saintlouis74
          Senior Member
          • Dec 2013
          • 102
          • USA

          #5
          Re: Quick Resistor Question (Sharp LC-32D43U)

          thanks for the support
          Attached Files

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Quick Resistor Question (Sharp LC-32D43U)

            OK, so the fuse did not blow, right? You need o get access to those two brown caps laying on their side to measure the DC Voltages at the two legs of each caps, just be real careful since you are working in the Primary (deadly side) of the circuit.
            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

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: Quick Resistor Question (Sharp LC-32D43U)

              Hi Can you post a picture of the whole of the back of the tv.
              and one of the other side of the power supply. Also as we cant see them for the wires close ups of the connectors showing the pin assigment 5v 12v gnd and so on.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Quick Resistor Question (Sharp LC-32D43U)

                I found good pictures provided by Shopjimmy, and the service manual.
                Attached Files
                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

                • saintlouis74
                  Senior Member
                  • Dec 2013
                  • 102
                  • USA

                  #9
                  Re: Quick Resistor Question (Sharp LC-32D43U)

                  Fuse was not blown, both the big caps read 168.9 VDC... and the picture budm posted are identical to my board..... Only thing i know about the TV is that it was working one day, and tried to turn it on the next and it wouldnt
                  Attached Files
                  Last edited by saintlouis74; 07-21-2014, 06:42 PM.

                  Comment

                  • selldoor
                    Slow Learner
                    • Dec 2010
                    • 7870

                    #10
                    Re: Quick Resistor Question (Sharp LC-32D43U)

                    Ok - Can you try for a better picture of the back of your board if its still out.
                    Will help us spot bad joints.
                    If it is back together then testing secondary voltages on the connectors is next. Lodge the black probe of your meter on a ground screw then with the red probe test all the pins in the sockets. Set meter on 200vdc
                    List the results eg
                    GND ......gnd
                    5v......4.99v
                    on/off.... 3.2v and so on
                    Please upload pictures using attachment function when ask for help on the repair
                    http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • saintlouis74
                      Senior Member
                      • Dec 2013
                      • 102
                      • USA

                      #11
                      Re: Quick Resistor Question (Sharp LC-32D43U)

                      sorry took so long to get back, but after probing all the pins got 0 Volt from every pin.. I did get 168vdc from the big caps, everything seems dead.. checked all the soldering joints they look good to me.

                      Comment

                      • saintlouis74
                        Senior Member
                        • Dec 2013
                        • 102
                        • USA

                        #12
                        Re: Quick Resistor Question (Sharp LC-32D43U)

                        i dunno i missed it but i think i solved it, thanks to budm post

                        therdhttps://www.badcaps.net/forum/showthread.php?t=33077&highlight=Sharp+LC-32D42U

                        when part arrive i will post update on repair thanks

                        Comment

                        • saintlouis74
                          Senior Member
                          • Dec 2013
                          • 102
                          • USA

                          #13
                          Re: Quick Resistor Question (Sharp LC-32D43U)

                          ok Diode was in bad shape, replaced that and found 2 resistor that was shorted out. i got them out and they are for sure blown... i just need guidance in finding a replacement part,

                          Markings:

                          F1J
                          FD774
                          0.12ohms

                          Location on Board:

                          R7933
                          R7626
                          Attached Files

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Quick Resistor Question (Sharp LC-32D43U)

                            OK, you have more problem. Those two resistors are Fusible resistors that will blow open circuit if the two power MOSFET Q7602, Q7603 are shorted out, you need to test and see if they have low resistance between S (Source) and D (Drain) pins, also the SMPS IC7603 may be also damaged. This is not good news for you.
                            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

                            • saintlouis74
                              Senior Member
                              • Dec 2013
                              • 102
                              • USA

                              #15
                              Re: Quick Resistor Question (Sharp LC-32D43U)

                              Originally posted by budm
                              OK, you have more problem. Those two resistors are Fusible resistors that will blow open circuit if the two power MOSFET Q7602, Q7603 are shorted out, you need to test and see if they have low resistance between S (Source) and D (Drain) pins, also the SMPS IC7603 may be also damaged. This is not good news for you.
                              MOSFET are goog from my knowledge,

                              i get 110 with red>source & black>drain
                              black>source & red>Drain i get 1
                              when i move Red>Gate then back to Drain i get a reading

                              As for IC7603 i followed :
                              https://www.badcaps.net/forum/showthread.php?t=27615

                              and i tested it and it seems ok also

                              Comment

                              • saintlouis74
                                Senior Member
                                • Dec 2013
                                • 102
                                • USA

                                #16
                                Re: Quick Resistor Question (Sharp LC-32D43U)

                                Where can I order the Fusible Resistors from? link if possible thanks

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Quick Resistor Question (Sharp LC-32D43U)

                                  That is strange to have two blown fusible resistors in the same circuit.
                                  Digikey sells them but they are non-stock item.
                                  http://www.digikey.com/product-searc...0&pageSize=500
                                  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

                                  • saintlouis74
                                    Senior Member
                                    • Dec 2013
                                    • 102
                                    • USA

                                    #18
                                    Re: Quick Resistor Question (Sharp LC-32D43U)

                                    Originally posted by budm
                                    That is strange to have two blown fusible resistors in the same circuit.
                                    Digikey sells them but they are non-stock item.
                                    http://www.digikey.com/product-searc...0&pageSize=500
                                    how many Watts is it suppose to be?

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #19
                                      Re: Quick Resistor Question (Sharp LC-32D43U)

                                      It looks to be around 1W, you will have to take the measurement on the body and look at the link I gave you for Digikey to see which one matches what you have. Or look at the attached PDF.
                                      Attached Files
                                      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

                                      • saintlouis74
                                        Senior Member
                                        • Dec 2013
                                        • 102
                                        • USA

                                        #20
                                        Re: Quick Resistor Question (Sharp LC-32D43U)

                                        Originally posted by budm
                                        It looks to be around 1W, you will have to take the measurement on the body and look at the link I gave you for Digikey to see which one matches what you have. Or look at the attached PDF.
                                        ohhok thanks

                                        Comment

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