SANYO DP19640 back light out...

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  • RAMSELECTRONICS
    ATARI boy
    • Jul 2015
    • 48
    • USA
    #1

    SANYO DP19640 back light out...

    I have a SANYO DP19640.

    When I turn on it did turned on the back light then in few seconds then off the back light but I can bare to see the LCD screen seem working but no light..

    I opened back panel and I see the board has built in power supply and inverted together.

    See the pictures in attached files.

    I checked all caps are good...

    I suspecting the two chips something.. Q7004 and IC7001

    Any idea where caused the problem with back light? OR anyone have fixed it before?
    thanks!
    Attached Files
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: SANYO DP19640 back light out...

      That MOSFET Q7004 got very hot, did you check the capacitance and ESR of the filter caps? Hopefully the Inverter transformer or the MOSFET is not damaged, you need to get the P/N of Q7004 to check the resistance between Source and Drain.
      If the lamps are worn out they can also cause too much current DRAIN, so there are many things you need to check.
      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

        • RAMSELECTRONICS
          ATARI boy
          • Jul 2015
          • 48
          • USA
          #3
          Re: SANYO DP19640 back light out...

          Okay thanks!! which Caps you want me to check? maybe you can circle on the picture.

          I see AliExpress sell the 20 Chips for $10.00

          thanks again!

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: SANYO DP19640 back light out...

              Did you get the P/N of Q7004? That should be checked first.
              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

                • RAMSELECTRONICS
                  ATARI boy
                  • Jul 2015
                  • 48
                  • USA
                  #5
                  Re: SANYO DP19640 back light out...

                  Yup it's TPC8218 H

                  Here what I found:
                  http://www.aliexpress.com/item/TPC82...339305292.html

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: SANYO DP19640 back light out...

                      TPC8218 Dual MOSFETs. Check the resistance between Source pins and Drain pins
                      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

                        • RAMSELECTRONICS
                          ATARI boy
                          • Jul 2015
                          • 48
                          • USA
                          #7
                          Re: SANYO DP19640 back light out...

                          I measurement Source and Drain looks like all open.

                          Of Course I desoldered the chip to out then measurement

                            Comment

                            • RAMSELECTRONICS
                              ATARI boy
                              • Jul 2015
                              • 48
                              • USA
                              #8
                              Re: SANYO DP19640 back light out...

                              I am thinking to make different to the TO-220....


                              Here for example: http://www.semicon.toshiba.co.jp/inf...&pid=TK72E08N1
                              Last edited by RAMSELECTRONICS; 12-20-2015, 12:50 PM.

                                Comment

                                • RAMSELECTRONICS
                                  ATARI boy
                                  • Jul 2015
                                  • 48
                                  • USA
                                  #9
                                  Re: SANYO DP19640 back light out...

                                  Back here again... I got new the Power Supply board from eBay and replaced it. but the issue are the same... uhhhh????

                                  I saw on the screen when happening.... When I turned on the power, screen show "Please wait" show red then change to "HDMI" display show red become to white then picture looks great for less 3 seconds then back light shutdown but the green light still on and I hardly to see the screen picture is still there.

                                  Possible bad CFL tube light inside the back-light? BUT short time turned on looks perfect??

                                  thanks!

                                    Comment

                                    • RJARRRPCGP
                                      Badcaps Legend
                                      • Jul 2004
                                      • 6301
                                      • USA
                                      #10
                                      Re: SANYO DP19640 back light out...

                                      Originally posted by RAMSELECTRONICS
                                      Back here again... I got new the Power Supply board from eBay and replaced it. but the issue are the same... uhhhh????

                                      I saw on the screen when happening.... When I turned on the power, screen show "Please wait" show red then change to "HDMI" display show red become to white then picture looks great for less 3 seconds then back light shutdown but the green light still on and I hardly to see the screen picture is still there.

                                      Possible bad CFL tube light inside the back-light? BUT short time turned on looks perfect??

                                      thanks!
                                      Possibly a bad CCFL bulb.

                                      I also saw a T5 fixture at HCRS with a bad T5 fluorescent tube do the same kind of thing.
                                      Any bad fluorescent tube in the same circuit will result in the ballast also shutting off the good bulb, too!
                                      Last edited by RJARRRPCGP; 01-28-2016, 08:40 PM.
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                                        Comment

                                        • RAMSELECTRONICS
                                          ATARI boy
                                          • Jul 2015
                                          • 48
                                          • USA
                                          #11
                                          Re: SANYO DP19640 back light out...

                                          Here I made a video... see the color.. red... then white... umm.. for sure bad one? where I get it.?
                                          SHOOT video not working... let me try other way
                                          Attached Files
                                          Last edited by RAMSELECTRONICS; 01-29-2016, 12:44 PM.

                                            Comment

                                            • RAMSELECTRONICS
                                              ATARI boy
                                              • Jul 2015
                                              • 48
                                              • USA
                                              #12
                                              Re: SANYO DP19640 back light out...

                                              Here
                                              https://youtu.be/AGADb5_yIdE

                                                Comment

                                                • budm
                                                  Badcaps Legend
                                                  • Feb 2010
                                                  • 40746
                                                  • USA
                                                  #13
                                                  Re: SANYO DP19640 back light out...

                                                  You have bad lamp, you can also see the ends of the lamp are blackened. Do not keep on using it, it will draw too much current and take out the inverter transformer and the MOSFETs if the over current protection circuit does not kick in.
                                                  Last edited by budm; 01-29-2016, 01:25 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

                                                    • RAMSELECTRONICS
                                                      ATARI boy
                                                      • Jul 2015
                                                      • 48
                                                      • USA
                                                      #14
                                                      Re: SANYO DP19640 back light out...

                                                      okay I will order new CCFL from eBay.
                                                      http://www.ebay.com/itm/2PCS-19-inch...EAAOSwR0JUUZ9p

                                                        Comment

                                                        • RAMSELECTRONICS
                                                          ATARI boy
                                                          • Jul 2015
                                                          • 48
                                                          • USA
                                                          #15
                                                          Re: SANYO DP19640 back light out...

                                                          Geez forgot leave a message.. I got replaced lamps and it's worked perfect! thanks!

                                                            Comment

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