insignia. no picture/back light

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  • tocold4u2
    Badcaps Veteran
    • Dec 2012
    • 284
    • usa

    #1

    insignia. no picture/back light

    i have a insignia e479mznkw1bm. i have a red stand by light.
    when i push power button the stand by light turns blue.
    still no picture...no sound if i hook a dvd player to it.the only response from remote is power on and power off.
    reading on power board
    3.079.- on/off
    24.03 -. diw
    11.85. - 12v
    11.85- 12v
    o-ground
    0-
    0
    24.38-24v
    24.38
    4.01-ps on
    4.96-5v
  • tocold4u2
    Badcaps Veteran
    • Dec 2012
    • 284
    • usa

    #2
    Re: insignia. no picture/back light

    main.logic has same readings. i tried to jumper the back light
    but couldnt get it to come on. any clues /help here

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: insignia. no picture/back light

      ON/OFF is going high so that indicates main board sending inverter on signal. Double check "DIW" is not "DIM" and see if you measure ~2.4V instead of ~24V.
      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

      • tocold4u2
        Badcaps Veteran
        • Dec 2012
        • 284
        • usa

        #4
        Re: insignia. no picture/back light

        yea that was. dim. not (diw). on/off is 3.1
        dim = 3.04

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: insignia. no picture/back light

          Can we see good clear pictures of the boards? So far it has all the correct signals and 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

          • tocold4u2
            Badcaps Veteran
            • Dec 2012
            • 284
            • usa

            #6
            Re: insignia. no picture/back light

            Here is a few pictures of each board
            Attached Files

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: insignia. no picture/back light

              Need high resolution picture of this board.
              https://www.badcaps.net/forum/attach...5&d=1391349191
              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

              • tocold4u2
                Badcaps Veteran
                • Dec 2012
                • 284
                • usa

                #8
                Re: insignia. no picture/back light

                These are taken will cell phone cause my camer is broke
                Attached Files

                Comment

                • tocold4u2
                  Badcaps Veteran
                  • Dec 2012
                  • 284
                  • usa

                  #9
                  Re: insignia. no picture/back light

                  Shpuldn t i get a 24v reading on inverter board ?

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: insignia. no picture/back light

                    Cannot see anything useful in those photos, you will need to have a good camera... any chance you can borrow one?
                    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

                    • tocold4u2
                      Badcaps Veteran
                      • Dec 2012
                      • 284
                      • usa

                      #11
                      Re: insignia. no picture/back light

                      I could but would be days before i could post anything .
                      Net is down here. I posted this with cell. not geting 24v on inverter board.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: insignia. no picture/back light

                        Where are you measuring the 24V? If you have a 24V power supply to the main board (for audio) it's likely you also have 24V for inverter... so check where you're probing.
                        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

                        • tocold4u2
                          Badcaps Veteran
                          • Dec 2012
                          • 284
                          • usa

                          #13
                          Re: insignia. no picture/back light

                          I just saw where wires plug in from power supply board to inverter. it says 24v..
                          Well now i was probing the other side of conector n got a spark ..
                          Lost 12v pover ..gona re check. voltages. on power board

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: insignia. no picture/back light

                            It looks like another one of those CMO with bad black fuse with '15', or '20' printed on top. The pictures are too poor to see anything. I hope you did not damage the 12V/24V powwer supply.
                            On the right side of the inverter, look for fuse 'F 1A/76V'
                            http://assets.shopjimmy.com/media/ca...j27d023893.jpg
                            Attached Files
                            Last edited by budm; 02-02-2014, 04:28 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

                            • tocold4u2
                              Badcaps Veteran
                              • Dec 2012
                              • 284
                              • usa

                              #15
                              Re: insignia. no picture/back light

                              yea budm it is a cmo inverter..looking f.or that fuse u mentioned

                              Comment

                              • tocold4u2
                                Badcaps Veteran
                                • Dec 2012
                                • 284
                                • usa

                                #16
                                Re: insignia. no picture/back light

                                i had .523 ohms on that. fuse f1a. but tge f 8a fuse i got nothing at all.
                                the f8a/125v. i got no ohms also

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: insignia. no picture/back light

                                  So one of the other white fuses show as open circuit?
                                  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

                                  • tocold4u2
                                    Badcaps Veteran
                                    • Dec 2012
                                    • 284
                                    • usa

                                    #18
                                    Re: insignia. no picture/back light

                                    both white fuses are open

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: insignia. no picture/back light

                                      Rare for both to be failed. What voltage do you measure on each end?
                                      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

                                      • tocold4u2
                                        Badcaps Veteran
                                        • Dec 2012
                                        • 284
                                        • usa

                                        #20
                                        Re: insignia. no picture/back light

                                        i got the power supply voltages back..the. white fuses both have
                                        24v on one end of fuse but .006 on bottom fuse and .004
                                        on the other fuse. the one on bottom has the .006

                                        Comment

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