Philips 37PFL4606 No Power

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  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #61
    Re: Philips 37PFL4606 No Power

    I believe that refers to their operating frequency resistance not their DC resistance. As long as it's not open circuit I would say it's fine.
    Willing to help but I'm no expert.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #62
      Re: Philips 37PFL4606 No Power

      BTW, just FYI:
      https://www.badcaps.net/forum/showth...t=86564&page=5
      This 37" board has the same low Voltage on C946 so the PFC Voltage booster is not working on this 37" board 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

      • dick_barton
        Badcaps Legend
        • Aug 2015
        • 6642
        • Wales

        #63
        Re: Philips 37PFL4606 No Power

        Post the voltages on the pins of IC902
        Willing to help but I'm no expert.

        Comment

        • trunks81
          Badcaps Veteran
          • May 2020
          • 265
          • Nederland

          #64
          Re: Philips 37PFL4606 No Power

          iam getting a very strange measurement, This is with 1K in place

          1=0.88V
          2=0V
          3=0V
          4=0V
          5=9.76V
          6=0V
          7=0V
          8=0V

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #65
            Re: Philips 37PFL4606 No Power

            You have lost the supply voltage (VCC) for the IC. Check you still have the 5VSTBY. If you do then you need to check the voltages on Q907.
            If you don't then it's back to measuring the voltages on the pins of IC905
            Last edited by dick_barton; 08-02-2020, 06:47 AM.
            Willing to help but I'm no expert.

            Comment

            • trunks81
              Badcaps Veteran
              • May 2020
              • 265
              • Nederland

              #66
              Re: Philips 37PFL4606 No Power

              5V is present ! iam getting the next IC907

              B=9.065V
              E=9.804V
              C= 9,79V

              IC905

              1=2.83V
              2=1.30V
              3=5.88V
              4=0V
              5=NC
              6=319V
              Last edited by trunks81; 08-02-2020, 07:58 AM.

              Comment

              • dick_barton
                Badcaps Legend
                • Aug 2015
                • 6642
                • Wales

                #67
                Re: Philips 37PFL4606 No Power

                What voltages do you have on the pins of IC902. The voltage at the collector (Q907) appears low. I seem to remember Budm mentioned it as being 15V which it currently is not.
                Willing to help but I'm no expert.

                Comment

                • trunks81
                  Badcaps Veteran
                  • May 2020
                  • 265
                  • Nederland

                  #68
                  Re: Philips 37PFL4606 No Power

                  Only getting an voltage on pins

                  1=0.88V
                  8=9.8V

                  All other pins are 0V
                  Last edited by trunks81; 08-02-2020, 11:08 AM.

                  Comment

                  • dick_barton
                    Badcaps Legend
                    • Aug 2015
                    • 6642
                    • Wales

                    #69
                    Re: Philips 37PFL4606 No Power

                    This is starting to confuse me.
                    The transistor Q907 has 9.8V at the emitter which goes to IC902 pin 8 via R947 but Pin 8 has 0V on it? Are you reading the IC pin numbers correctly
                    Attached Files
                    Last edited by dick_barton; 08-02-2020, 11:04 AM.
                    Willing to help but I'm no expert.

                    Comment

                    • trunks81
                      Badcaps Veteran
                      • May 2020
                      • 265
                      • Nederland

                      #70
                      Re: Philips 37PFL4606 No Power

                      My bad.. i whas counting the pins wrong.. apparently the pins goes like this

                      1=8
                      2=7
                      3=6
                      4=5

                      and i whas counting like this

                      1=5
                      2=6
                      3=7
                      4=8

                      Only getting an voltage on pins

                      1=0.88V
                      8=9.8V

                      All other pins are 0V
                      Last edited by trunks81; 08-02-2020, 11:13 AM.

                      Comment

                      • dick_barton
                        Badcaps Legend
                        • Aug 2015
                        • 6642
                        • Wales

                        #71
                        Re: Philips 37PFL4606 No Power

                        You need to recheck this one and your other thread for previous readings given if you have been miscounting the pinouts.
                        The pin count goes anti-clockwise in a circle. Normally pin 1 is marked on the board or has a dot on the IC next to pin1.
                        Last edited by dick_barton; 08-02-2020, 11:22 AM.
                        Willing to help but I'm no expert.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #72
                          Re: Philips 37PFL4606 No Power

                          Originally posted by dick_barton
                          You need to recheck this one and your other thread for previous readings given if you have been miscounting the pinouts.
                          The pin count goes anti-clockwise in a circle. Normally pin 1 is marked on the board or has a dot on the IC next to pin1.
                          This is really causing a lot of confusing in this thread and the other thread (47"), especially when the pinout is counted wrong.
                          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

                          • trunks81
                            Badcaps Veteran
                            • May 2020
                            • 265
                            • Nederland

                            #73
                            Re: Philips 37PFL4606 No Power

                            should it make an difference if i remove the brownout protection ?

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #74
                              Re: Philips 37PFL4606 No Power

                              Originally posted by trunks81
                              should it make an difference if i remove the brownout protection ?
                              You are getting 4.6V in standby and 5V when TV is turned on, so no need to do anything with the Brownout protection.
                              I still cannot figure out why both boards are getting only about 10V on C946.
                              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

                              • trunks81
                                Badcaps Veteran
                                • May 2020
                                • 265
                                • Nederland

                                #75
                                Re: Philips 37PFL4606 No Power

                                When i connect mainboard in the tv iam getting 11.4V on C946

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #76
                                  Re: Philips 37PFL4606 No Power

                                  Originally posted by trunks81
                                  When i connect mainboard in the tv iam getting 11.4V on C946
                                  The PFC IC and the SMPS IC need 12.5V for it to startup and run, so if you check the Voltage on the main cap right now what Voltage do you have, 395VDC?
                                  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

                                  • trunks81
                                    Badcaps Veteran
                                    • May 2020
                                    • 265
                                    • Nederland

                                    #77
                                    Re: Philips 37PFL4606 No Power

                                    Originally posted by budm
                                    The PFC IC and the SMPS IC need 12.5V for it to startup and run, so if you check the Voltage on the main cap right now what Voltage do you have, 395VDC?
                                    Its 309VDC

                                    Comment

                                    • budm
                                      Badcaps Legend
                                      • Feb 2010
                                      • 40746
                                      • USA

                                      #78
                                      Re: Philips 37PFL4606 No Power

                                      Well, as you can see, the PFC Voltage booster is not working due to low Voltage on C946, we know that we need to have about 15V on C946, that is the reading from good working board that you already returned the 47" TV to the customer, and now we are trying to fix the 37" and another 47" which both of them have the same problem, low Voltage on C946.
                                      I still do not know why both boards are doing the same thing.
                                      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

                                      • trunks81
                                        Badcaps Veteran
                                        • May 2020
                                        • 265
                                        • Nederland

                                        #79
                                        Re: Philips 37PFL4606 No Power

                                        Oke the tv boots and iam getting 14.5V on C946, Only the PFC is around 300V
                                        Allready checked the three 1M resistors and they read fine out of circuit
                                        Last edited by trunks81; 08-16-2020, 06:24 AM.

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #80
                                          Re: Philips 37PFL4606 No Power

                                          Originally posted by trunks81
                                          Oke the tv boots and iam getting 14.5V on C946, Only the PFC is around 300V
                                          Allready checked the three 1M resistors and they read fine out of circuit
                                          So what did you do to get 14.5V on C946 back.
                                          Try unplugging the power for 5 minutes the run the Voltage log test on the main and C946 using 1K force on to see what we have.
                                          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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