Panasonic TC-42PX14 Zener Diode

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  • mr.sky
    Senior Member
    • Sep 2011
    • 54

    #1

    Panasonic TC-42PX14 Zener Diode

    Hello, this Zener Diode is on the A-board, it is part of
    the 15v rail that leads to IC5608 and 5607. In an earlier
    post I have attached the Schematics.
    Can someone identify how many volts this Zener Diode is.

    Panasonic parts does not identify the Diode. Suppose they
    want you to buy from them. Unfortunately they do not
    stock it.
    Thanks!
    Attached Files
  • Mt.Man
    Senior Member
    • Jun 2012
    • 53
    • USA

    #2
    Re: Panasonic TC-42PX14 Zener Diode

    Do you have the diode location number Dxxxx?

    Comment

    • mr.sky
      Senior Member
      • Sep 2011
      • 54

      #3
      Re: Panasonic TC-42PX14 Zener Diode

      D5573 It is near the 9v regulator IC5401
      Last edited by mr.sky; 06-19-2012, 08:40 AM.

      Comment

      • JimmysTGP
        Member
        • May 2012
        • 45
        • US

        #4
        Re: Panasonic TC-42PX14 Zener Diode

        I must be blind, read me the colors off the diode.

        If it is a red, Black, Green. Then it is a RLZ12
        Last edited by JimmysTGP; 06-19-2012, 10:01 AM. Reason: more info

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Panasonic TC-42PX14 Zener Diode

          Can you please give me the link to that schematic?
          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

          • Mt.Man
            Senior Member
            • Jun 2012
            • 53
            • USA

            #6
            Re: Panasonic TC-42PX14 Zener Diode

            Panasonic part number B0BC01100001. However they do not say what voltage rating it is. Its on the output of IC5401 which is the Sub9v. Most likely used for protection. Just guessing maybe 10v or 11v. Input to IC5401 is 15V.

            Comment

            • JimmysTGP
              Member
              • May 2012
              • 45
              • US

              #7
              Re: Panasonic TC-42PX14 Zener Diode

              I guess theirs two ways we can attack this, but if your ability to see the diode as well could ultimatly swing the other. Just remember your dealing with a LL-34, hope this helps.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Panasonic TC-42PX14 Zener Diode

                If it is used as a protection, that means its Zener voltage point will be higher than the output voltage of the IC5401, so the circuit should still function without it and you can also measure the output voltage of the IC5401 and then use Zener Diode that is about 2V higher than the output voltage.
                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

                • mr.sky
                  Senior Member
                  • Sep 2011
                  • 54

                  #9
                  Re: Panasonic TC-42PX14 Zener Diode

                  Sorry guys, did not respond yesterday. Ended up in hospital
                  with Great Pains in Abdomen, after Ctscan, I have a Inflamed
                  Colitis. So much for that.
                  yes, the color is red, black green.
                  I am not getting 15v to the diode or to IC5401, reading is
                  5.4v to both components.

                  Comment

                  • mr.sky
                    Senior Member
                    • Sep 2011
                    • 54

                    #10
                    Re: Panasonic TC-42PX14 Zener Diode

                    Originally posted by budm
                    Can you please give me the link to that schematic?
                    budm: here is the link to Schematic

                    http://www.mediafire.com/file/pgdrdbmc2ynu9km

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Panasonic TC-42PX14 Zener Diode

                      It is big download file, downloading it, can you please point to which page this circuit is on?
                      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

                      • mr.sky
                        Senior Member
                        • Sep 2011
                        • 54

                        #12
                        Re: Panasonic TC-42PX14 Zener Diode

                        Originally posted by budm
                        It is big download file, downloading it, can you please point to which page this circuit is on?
                        Page 30 and 46

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #13
                          Re: Panasonic TC-42PX14 Zener Diode

                          Ok, the IC5401 is a 9V voltage regulator, so the Zener Diode may be 12V Zener.
                          So next thing for me is to find out what generates the F15V source.
                          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

                          • mr.sky
                            Senior Member
                            • Sep 2011
                            • 54

                            #14
                            Re: Panasonic TC-42PX14 Zener Diode

                            Originally posted by budm
                            Ok, the IC5401 is a 9V voltage regulator, so the Zener Diode may be 12V Zener.
                            So next thing for me is to find out what generates the F15V source.


                            budm, read Slide #28 the last paragraph. I think this is why
                            I am not getting F-15v from outpins from power supply board.
                            There is a 3.3v 6pin voltage regulator on the component side of
                            the A board, maybe this is the one that triggers the command to
                            to acitivate the The PANEL MAIN ON command turns on the power supply circuit that outputs the Vsus, Vda, 15V, and 5V.
                            Let me note my A-board does not have IC 9004
                            Last edited by mr.sky; 06-20-2012, 11:22 PM.

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Panasonic TC-42PX14 Zener Diode

                              OK, I figure out where the F15V is generated from, see PDF/JPG attached.
                              This F15V is called F15V_STBY which is the always on standby power supply.
                              So you need to check the voltage at the IC502 which generated the regulated F15V voltages for a lot of circuits as I redlined.
                              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

                              • mr.sky
                                Senior Member
                                • Sep 2011
                                • 54

                                #16
                                Re: Panasonic TC-42PX14 Zener Diode

                                Originally posted by budm
                                OK, I figure out where the F15V is generated from, see PDF/JPG attached.
                                This F15V is called F15V_STBY which is the always on standby power supply.
                                So you need to check the voltage at the IC502 which generated the regulated F15V voltages for a lot of circuits as I redlined.
                                budm, Thanks for the diagrams. let me update you and others who
                                are following this thread.
                                On first diagram where IC502, I am not getting 15v at all.
                                Before I press the power button, reading is at 3.0v. Once
                                I power up unit it goes to 5.4v, same reading I get at the
                                A Board at IC 5401 and IC5608.
                                Also, Pins 7,8,9 same voltages at connector P6.
                                The unit is only come on for a few seconds, enough to take
                                a reading then shuts down within 5 seconds.
                                Note, I took the reading from pin 4 of IC502

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Panasonic TC-42PX14 Zener Diode

                                  IC502 is the standby power supply (15V) which should be always running. The other power supply circuits is right below it is also always on, do you get any voltage there? There should be voltage at Q505, that section is for the standby 5V power supply.
                                  Basically, transformer T200 is for standby 5V and standby 15V power supply, so you MUST have these voltages.
                                  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

                                  • mr.sky
                                    Senior Member
                                    • Sep 2011
                                    • 54

                                    #18
                                    Re: Panasonic TC-42PX14 Zener Diode

                                    Originally posted by budm
                                    IC502 is the standby power supply (15V) which should be always running. The other power supply circuits is right below it is also always on, do you get any voltage there? There should be voltage at Q505, that section is for the standby 5V power supply.
                                    Basically, transformer T200 is for standby 5V and standby 15V power supply, so you MUST have these voltages.
                                    I will check it out, I also tried another new power supply board
                                    that I received last week. And the same results.
                                    Who knows could be bad too, good thing I got it for 30bucks.
                                    I am looking at page 32, and on top of board, there is a 3
                                    leg diode, looks like a regular size voltage regulator, but it is
                                    a diode, D502. Going to have lunch and test voltages like you
                                    mentioned above.

                                    Comment

                                    • mr.sky
                                      Senior Member
                                      • Sep 2011
                                      • 54

                                      #19
                                      Re: Panasonic TC-42PX14 Zener Diode

                                      Will take those voltage readings tomorrow, seems my Amprobe 38
                                      meter, needs another battery. Readings flucuate.
                                      budm, so standby should always be there, without powering up
                                      unit, correct? The only voltage i get on P6 connector is the
                                      5vstandby. That is with just the power cord plugged in.
                                      Last edited by mr.sky; 06-21-2012, 10:32 PM.

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: Panasonic TC-42PX14 Zener Diode

                                        Yes, the standby power supply will start running the minute the power plug is plugged into the outlet. All TVs need standby power supply to run the processor on the main board and the remote receiver so it will be ready to take command to turn on the rest of the power supplies from the power switch or from the remote control. This is how TV uses less power when it is not on.
                                        Are you getting any DC at IC502 PIN2 VCC input pin? and the voltage reading on the rest of the pins of IC502.
                                        Since you are getting the 5V, that means the transformer is working.
                                        Last edited by budm; 06-21-2012, 10:43 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

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