coby LED 2326 will not turn on

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  • CR Designs
    Badcaps Veteran
    • Dec 2012
    • 430
    • USA

    #1

    coby LED 2326 will not turn on

    Picked this TV up, The Tv will not turn on .It has a blue led light on in the right hand corner that comes on when you plug it in. If you hit the power button again the light gets brighter for a second when the tV shuts off. All the voltage is right on the power board 5v and 12v. On the main board the powers are right for 12v and 5v but the 3.3v is not right. It is measuring 5.27v
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: coby LED 2326 will not turn on

    Where is that 3.3V test point? Is it under that long board attached to the power supply board?
    I see the connector on the left side of the board where it has 3.3v label on it, so it must be 3.3V regulator or buck regulator on the main board.
    Last edited by budm; 03-27-2013, 10:37 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

    • CR Designs
      Badcaps Veteran
      • Dec 2012
      • 430
      • USA

      #3
      Re: coby LED 2326 will not turn on

      Originally posted by budm
      Where is that 3.3V test point? Is it under that long board attached to the power supply board?
      Budm I tested it on the main board at the plug marked 3.3v

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: coby LED 2326 will not turn on

        Can you trace that back to the connection on the power supply board since I can only the the connector labeled with 5V and 12v OUTPUTS. There must be a regulator some where that drops the 5V down to 3.3V.
        I see at least two 3-leg regulators on the main board.
        Last edited by budm; 03-27-2013, 10:38 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

        • CR Designs
          Badcaps Veteran
          • Dec 2012
          • 430
          • USA

          #5
          Re: coby LED 2326 will not turn on

          Originally posted by budm
          Can you trace that back to the connection on the power supply board since I can only the the connector labeled with 5V and 12v OUTPUTS. There must be a regulator some where that drops the 5V down to 3.3V.
          I see at least two 3-leg regulators on the main board.
          budm, I can't trace it. here's a few more pictures. let me know if you need more
          Attached Files

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: coby LED 2326 will not turn on

            Coby!! I thought they made trouser presses!!
            U21 is an adjustable VR - can you test it -you have had lots of practice with those.
            Also what is the value of the little attached resistors.


            EDIT sorry that is Corby
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870

              #7
              Re: coby LED 2326 will not turn on

              Budm did say trace it on the power supply (not sure if that is what he meant) but you have posted pics of the main board.
              Can you do a close up of the other VR and on the power supply a pic from the side
              showing all the legend for the connector and another shot of the back of the power supply
              as the bit needed to trace back from the pin is flashed out.

              ALSO what is the black blodge by the other connector on the main board has something died there - can you clean it off with isopropyl alcohol. There is also another streak in the last 3 opics can you clean that off as well in case it has gone conductive.

              None conductive stuff and dust heat up and if they get to the point where they oxidize or start to burn it can turn to carbon which is conductive.
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

              Comment

              • CR Designs
                Badcaps Veteran
                • Dec 2012
                • 430
                • USA

                #8
                Re: coby LED 2326 will not turn on

                Originally posted by selldoor
                Coby!! I thought they made trouser presses!!
                U21 is an adjustable VR - can you test it -you have had lots of practice with those.
                Also what is the value of the little attached resistors.


                EDIT sorry that is Corby
                selldoor, do I test u21 with power on or off? I will be posting more pictures soon. The brown stuff your seeing on the board i think is glue. I will try and get it off

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: coby LED 2326 will not turn on

                  Power on, I think one of those regulator is for the 3.3V.
                  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

                  • CR Designs
                    Badcaps Veteran
                    • Dec 2012
                    • 430
                    • USA

                    #10
                    Re: coby LED 2326 will not turn on

                    Originally posted by selldoor
                    Budm did say trace it on the power supply (not sure if that is what he meant) but you have posted pics of the main board.
                    Can you do a close up of the other VR and on the power supply a pic from the side
                    showing all the legend for the connector and another shot of the back of the power supply
                    as the bit needed to trace back from the pin is flashed out.

                    ALSO what is the black blodge by the other connector on the main board has something died there - can you clean it off with isopropyl alcohol. There is also another streak in the last 3 opics can you clean that off as well in case it has gone conductive.

                    None conductive stuff and dust heat up and if they get to the point where they oxidize or start to burn it can turn to carbon which is conductive.
                    Here's more pictures of what you wanted selldoor.
                    Attached Files

                    Comment

                    • selldoor
                      Slow Learner
                      • Dec 2010
                      • 7870

                      #11
                      Re: coby LED 2326 will not turn on

                      Ok - U20 is the 3.3 volt VR but what part numbers are the two on the back U3 and U4

                      Also in pic4 just above R29 there is a black spot between two traces - is it just debris?
                      can you remove it and check the traces are not bridged.
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

                      • CR Designs
                        Badcaps Veteran
                        • Dec 2012
                        • 430
                        • USA

                        #12
                        Re: coby LED 2326 will not turn on

                        Originally posted by selldoor
                        Ok - U20 is the 3.3 volt VR but what part numbers are the two on the back U3 and U4

                        Also in pic4 just above R29 there is a black spot between two traces - is it just debris?
                        can you remove it and check the traces are not bridged.
                        Part numbers
                        U3 3251 R64 11051
                        U4 ME 15N10

                        R29 was nothing just something on the board
                        Attached Files

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870

                          #13
                          Re: coby LED 2326 will not turn on

                          U4 is a mosfet
                          https://cdn.badcaps-static.com/pdfs/...33c86bdf36.pdf

                          There is something before 3251 ? on U3 two letters?
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                          Comment

                          • CR Designs
                            Badcaps Veteran
                            • Dec 2012
                            • 430
                            • USA

                            #14
                            Re: coby LED 2326 will not turn on

                            Originally posted by selldoor
                            U4 is a mosfet
                            https://cdn.badcaps-static.com/pdfs/...33c86bdf36.pdf

                            There is something before 3251 ? on U3 two letters?
                            Looks like it could be II or 11

                            Comment

                            • CR Designs
                              Badcaps Veteran
                              • Dec 2012
                              • 430
                              • USA

                              #15
                              Re: coby LED 2326 will not turn on

                              Originally posted by selldoor
                              Coby!! I thought they made trouser presses!!
                              U21 is an adjustable VR - can you test it -you have had lots of practice with those.
                              Also what is the value of the little attached resistors.


                              EDIT sorry that is Corby
                              Selldoor, tested U21 and U20

                              U21 Tab-1.2v, pin 1-3.3v, center pin- 3.308v, pin 2- 000.1v

                              U20 tab -3.206v, pin1-2.02v, center pin-3.201v, pin 2-5.14v

                              Comment

                              • selldoor
                                Slow Learner
                                • Dec 2010
                                • 7870

                                #16
                                Re: coby LED 2326 will not turn on

                                Ok so still 5v on that pin marked 3.3? Can you trace back from that pin to either of these
                                VRs
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                • CR Designs
                                  Badcaps Veteran
                                  • Dec 2012
                                  • 430
                                  • USA

                                  #17
                                  Re: coby LED 2326 will not turn on

                                  Originally posted by selldoor
                                  Ok so still 5v on that pin marked 3.3? Can you trace back from that pin to either of these
                                  VRs
                                  Yes still 5v

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: coby LED 2326 will not turn on

                                    All too often I have encountered errors on labels -- engineers in a rush to finish by 5pm?
                                    (That happened today and I realised I forgot something important but luckily I can easily sort it out Tuesday...)
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment

                                    • CR Designs
                                      Badcaps Veteran
                                      • Dec 2012
                                      • 430
                                      • USA

                                      #19
                                      Re: coby LED 2326 will not turn on

                                      Guys, here's more picture's I can't trace this board. May be these will help.
                                      Attached Files

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #20
                                        Re: coby LED 2326 will not turn on

                                        Good news is, neither can we. This board will use at least 4 layers meaning two hidden between the top and bottom. More likely it will be 6 layers making it even harder.
                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                        Comment

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