Need help with resistor value please

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #41
    Re: Need help with resistor value please

    Or just read this thread.
    https://www.badcaps.net/forum/showthread.php?t=78439
    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

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6355
      • Germany

      #42
      Re: Need help with resistor value please

      [QUOTE=budm;980613] answer OP why you want Ohm test when Diode Test was OK to him,

      OP: could you please show us yours DM which you do test with... thanks.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #43
        Re: Need help with resistor value please

        Oh look, I edit post in this thread here too! After I found more info about the unit.
        https://www.badcaps.net/forum/showpo...18&postcount=6
        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

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #44
          Re: Need help with resistor value please

          [QUOTE=Diah;980619]
          Originally posted by budm
          answer OP why you want Ohm test when Diode Test was OK to him,

          OP: could you please show us yours DM which you do test with... thanks.
          To Diah if you want to know, read below:
          if you would like to have lesson for electronic mathematics to analysis and print good design... ask with respectful i will show you and teach you... other wise keep swim with yours fool of unknown how we calculated the Freq before the print...
          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

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #45
            Re: Need help with resistor value please

            Originally posted by JunkmanJimbo
            Please see attached pictures of IC9801 and IC9201.
            IC9801 PFC IC UCC28063: Check resistance between VCC pin 12 and GND pin 6.

            IC9201 SMPS IC SSC9522: Check the resistance between VCC pin 2 and GND pin 4.
            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

            • JunkmanJimbo
              Senior Member
              • Mar 2017
              • 192
              • United States

              #46
              Re: Need help with resistor value please

              Originally posted by budm
              IC9801 PFC IC UCC28063: Check resistance between VCC pin 12 and GND pin 6. With my ohm meter set to 20k I get a reading of 2.72 between pin 12 and pin 6.

              IC9201 SMPS IC SSC9522: Check the resistance between VCC pin 2 and GND pin 4.
              With my ohm meter set to 20k I get a reading of 2.72 between pin 2 and pin 4.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #47
                Re: Need help with resistor value please

                So both IC's show exact same reading, 2.72K?
                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

                • JunkmanJimbo
                  Senior Member
                  • Mar 2017
                  • 192
                  • United States

                  #48
                  Re: Need help with resistor value please

                  Originally posted by budm
                  So both IC's show exact same reading, 2.72K?
                  That is correct. Both show the same reading.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #49
                    Re: Need help with resistor value please

                    Originally posted by JunkmanJimbo
                    That is correct. Both show the same reading.
                    OK, let me look at the board layout.
                    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

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #50
                      Re: Need help with resistor value please

                      Check the resistance between the two legs of cap C9211, C9146.
                      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

                      • JunkmanJimbo
                        Senior Member
                        • Mar 2017
                        • 192
                        • United States

                        #51
                        Re: Need help with resistor value please

                        Originally posted by budm
                        Check the resistance between the two legs of cap C9211, C9146.
                        They both actually show the same numbers 2.72.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #52
                          Re: Need help with resistor value please

                          Originally posted by JunkmanJimbo
                          They both actually show the same numbers 2.72.
                          OK.
                          Lift up one end of the jumper wire J928 or J930 of the board, this will disconnect the switched VCC from the 12V/24V SMPS IC.

                          Put in the new R9114 SMD resistor.
                          You will power up the power board by itself first to make sure the R9114 will not blow up, then you will connected a 220 ~ 470 Ohms (what ever value you have in that range) resistor between PS-ON and 5V/3.3V pin to force on the power supply and see if you do have 380 ~ 400VDC on the main 450VDC main filter cap or if R9114 will blow up again.
                          BTW, do you know what wattage of the replacement of R9114 is? Is it the same physical size as original one?
                          This power supply and mainboard also known for bad solder joints on the connector that goes to the main 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

                          • JunkmanJimbo
                            Senior Member
                            • Mar 2017
                            • 192
                            • United States

                            #53
                            Re: Need help with resistor value please

                            Originally posted by budm
                            OK.
                            Lift up one end of the jumper wire J928 or J930 of the board, this will disconnect the switched VCC from the 12V/24V SMPS IC.

                            Put in the new R9114 SMD resistor.
                            You will power up the power board by itself first to make sure the R9114 will not blow up, then you will connected a 220 ~ 470 Ohms (what ever value you have in that range) resistor between PS-ON and 5V/3.3V pin to force on the power supply and see if you do have 380 ~ 400VDC on the main 450VDC main filter cap or if R9114 will blow up again.
                            BTW, do you know what wattage of the replacement of R9114 is? Is it the same physical size as original one?
                            This power supply and mainboard also known for bad solder joints on the connector that goes to the main board.
                            I can do part of this but I don't have any resistors to perform that task between PS-ON and 5V/3.3V pin. Is there any other way to do this? The SMD R9114 resistor is the resistor I got from the youtube video posted earlier. Sorry, I don't have everything I need to do this. If there is another way please let me know. I appreciate your patience, understanding and all of your help.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #54
                              Re: Need help with resistor value please

                              Originally posted by JunkmanJimbo
                              I can do part of this but I don't have any resistors to perform that task between PS-ON and 5V/3.3V pin. Is there any other way to do this? The SMD R9114 resistor is the resistor I got from the youtube video posted earlier. Sorry, I don't have everything I need to do this. If there is another way please let me know. I appreciate your patience, understanding and all of your help.
                              You can do the force on test without the resistor, I suggest to use resistor in case you make wrong connection that can cause damage to the circuit, so if you perform the connection correctly for sure then you can do without using resistor, so inspect real well on how you have the PS-ON and 5V/3.3 pins connected together, I would solder one wire to each pin then you can connect the end of the wires together after powering up then wait about 5 seconds before connecting the two ends of the wire together to simulate power on condition.
                              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

                              • JunkmanJimbo
                                Senior Member
                                • Mar 2017
                                • 192
                                • United States

                                #55
                                Re: Need help with resistor value please

                                Originally posted by budm
                                You can do the force on test without the resistor, I suggest to use resistor in case you make wrong connection that can cause damage to the circuit, so if you perform the connection correctly for sure then you can do without using resistor, so inspect real well on how you have the PS-ON and 5V/3.3 pins connected together, I would solder one wire to each pin then you can connect the end of the wires together after powering up then wait about 5 seconds before connecting the two ends of the wire together to simulate power on condition.
                                Thank you budm. I will try to get this done tomorrow and I will definitely let you know the outcome. Thanks again for everything. It is very much appreciated.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #56
                                  Re: Need help with resistor value please

                                  Right now we are trying to find out which circuit is drawing so much current to flow through R9114 that cause it to burn up.
                                  If it works, you should see about 380 ~ 400VDC on the main filter cap when you touch the PS-On wire and the 5V/3.3V together.
                                  There will be no 12V/24V since we lift up one end of the jumper wire that feed switched VCC to the 12V/24V SMPS IC.
                                  Last edited by budm; 08-12-2020, 06:26 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

                                  • JunkmanJimbo
                                    Senior Member
                                    • Mar 2017
                                    • 192
                                    • United States

                                    #57
                                    Re: Need help with resistor value please

                                    Originally posted by budm
                                    Right now we are trying to find out which circuit is drawing so much current to flow through R9114 that cause it to burn up.
                                    If it works, you should see about 380 ~ 400VDC on the main filter cap when you touch the PS-On wire and the 5V/3.3V together.
                                    There will be no 12V/24V since we lift up one end of the jumper wire that feed switched VCC to the 12V/24V SMPS IC.
                                    Please explain main filter cap and if possible the location. Thanks

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #58
                                      Re: Need help with resistor value please

                                      Originally posted by JunkmanJimbo
                                      Please explain main filter cap and if possible the location. Thanks
                                      There are 3 of them, they are 82uF 450VDC C9804, C9805, C9823.
                                      You can check the Voltage on the two legs of any one of the 3 caps since they are connected in parallel.
                                      You must be real careful since you are working on the HOT deadly side so not touch anything with your hands or body, do not let the test probes slip either.
                                      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

                                      • Topcat
                                        The Boss Stooge
                                        • Oct 2003
                                        • 16956
                                        • United States

                                        #59
                                        Re: Need help with resistor value please

                                        [QUOTE=Diah;980619]
                                        Originally posted by budm
                                        answer OP why you want Ohm test when Diode Test was OK to him,

                                        OP: could you please show us yours DM which you do test with... thanks.
                                        You need to cool your act down a little....
                                        <--- Badcaps.net Founder

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                                        Comment

                                        • JunkmanJimbo
                                          Senior Member
                                          • Mar 2017
                                          • 192
                                          • United States

                                          #60
                                          Re: Need help with resistor value please

                                          Originally posted by budm
                                          There are 3 of them, they are 82uF 450VDC C9804, C9805, C9823.
                                          You can check the Voltage on the two legs of any one of the 3 caps since they are connected in parallel.
                                          You must be real careful since you are working on the HOT deadly side so not touch anything with your hands or body, do not let the test probes slip either.
                                          Hey budm, sorry I didn't get a chance to do this yesterday. I just now followed your procedure and the resistor blew as soon as I plugged in the power cord. I didn't even get the chance to power on the board. The first time it didn't blow until I turned the TV on. This makes no sense. I did use a small clamp with rubber ends to clamp the board to the table to hold it in place. I clamped it over the power connector where the power cord plugs in. I don't know why that would have made a difference.

                                          Comment

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