32ME402V/F7 no power on

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  • mcross
    Badcaps Veteran
    • Sep 2011
    • 201
    • USA

    #1

    32ME402V/F7 no power on

    I have 2 of these both have a BA21F0F0102 power supply, one is ver:1 and ver: 3 (ex BA21F0F0102 1 ) . the big transformer has a high pitched whine when you plug tv in. No stb light, tested diodes , good.
    only reading i get on ps is
    2.30 volts
    big cap is 160v
    any ideas?

    Mike
    Attached Files
  • CapLeaker
    Leaking Member
    • Dec 2014
    • 8102
    • Canada

    #2
    Re: 32ME402V/F7 no power on

    Well... are both PSU's doing the same thing? On the top right of the PSU there is a ribbon cable with a pin out. Measure everything and post it with name and volts measured. Just by saying you got 2.3V, I have no idea where. Same thing, if would I tell you there is beer in the fridge and don't tell you in which fridge the beer is.
    Last edited by CapLeaker; 09-01-2015, 03:08 PM.

    Comment

    • mcross
      Badcaps Veteran
      • Sep 2011
      • 201
      • USA

      #3
      Re: 32ME402V/F7 no power on

      Sorry, will get all and post, the 2.3v is stb voltage
      mike

      Comment

      • Caleb
        Smokin IC's
        • Feb 2013
        • 645
        • USA

        #4
        Re: 32ME402V/F7 no power on

        have you checked the smd diodes on the back of the power board? also check all zener diodes in the primary around the fet
        Liberating magic smoke one part at a time

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8102
          • Canada

          #5
          Re: 32ME402V/F7 no power on

          disconnect the main board and see if the STBY voltage comes up on the PSU

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: 32ME402V/F7 no power on

            Originally posted by capleaker
            disconnect the main board and see if the stby voltage comes up on the psu
            Originally posted by caleb
            have you checked the smd diodes on the back of the power board? Also check all zener diodes in the primary around the fet
            +1.
            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

            • mcross
              Badcaps Veteran
              • Sep 2011
              • 201
              • USA

              #7
              Re: 32ME402V/F7 no power on

              Disconnected the main , stb comes up to 3.3v (good), 12v and 24v pins are 8.94v, Checked diodes all look good. From what i have read this is common on this psu and sim versions . any other ideas. Also to make things clear, i have 2 of theses tv's both doing the same thing. as soon as they are plugged in the big transformer starts a high pitched whine, no other symptoms. I added a pic of the other ver of the board, This one has z-diodes where the other has none, 2 by the big transformer and 3 on the cold side 2 of which are by the led back light connector
              Mike
              Attached Files

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: 32ME402V/F7 no power on

                "Disconnected the main , stb comes up to 3.3v (good), 12v and 24v pins are 8.94v"
                I do not see 12V pin, I see switched 21V and 24V pins.
                When the main board is not connected, there will be no PS-ON signal to turn on the switched 21V or the switched 24VDC power supply sections, so what you have error Voltage readings on the 21V, and 24V pins.
                What you need to do next is to check the resistance between the STBY pin of the main board against ground to see if it shows low resistance, it can be that the main board is drawing too much current from the power supply, or the power supply STBY is too weak.
                You can also do the load test on the stby with resistor to see if it can handle 0.5A or so.
                CN1001, the smaller black connector for the smaller flat white ribbon cable is for the LEDs.
                Pictures provided by SHOPJIMMY.
                http://www.shopjimmy.com/catalogsear...?q=BA21F0F0102
                Attached Files
                Last edited by budm; 09-04-2015, 10:57 AM.
                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

                • mcross
                  Badcaps Veteran
                  • Sep 2011
                  • 201
                  • USA

                  #9
                  Re: 32ME402V/F7 no power on

                  these are present with main disconnected not forced on

                  stb = 3.3v

                  24v = 8.83v


                  21v = 7.56v
                  Last edited by mcross; 09-04-2015, 12:51 PM.

                  Comment

                  • mcross
                    Badcaps Veteran
                    • Sep 2011
                    • 201
                    • USA

                    #10
                    Re: 32ME402V/F7 no power on

                    main board stb pin shows no resistance , bad main.
                    mike

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: 32ME402V/F7 no power on

                      OK, I traced out the bottom side of the board, there are three output windings on the secondary side of the power transformer.
                      D656 (SMD) is for negative power supply, D653 is for one of the two positive power supply, D650/651 for second positive power supply.
                      So just POWER UP the power supply board by itself, check the DCV between the two legs of the cap c652, C653, and C656.
                      Last edited by budm; 09-04-2015, 02:02 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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