Sanyo DP42848 No Backlights

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  • landyboy
    Badcaps Veteran
    • Apr 2013
    • 443
    • USA
    #1

    Sanyo DP42848 No Backlights

    Picked up a Sanyo DP42848. Set turns om and has sound. I can see a picture with the flashlight test. So it appears the backlights are not coming on. I have tested the PS and here is what I have:
    24V 23.89vdc
    SGND 0
    12v 12.09vdc
    SGND 0
    5v 4.99vdc
    SGND 0
    PSON 4.88

    Also have 23.87 volts on the 24v pins where the inverter board connects to the PS

    I noticed two very slightly bulged caps on the main board.
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    • capkid
      Badcaps Legend
      • Oct 2010
      • 1339
      • United States
      #2
      Re: Sanyo DP42848 No Backlights

      I don't see the bulging caps on the main board. These TVs are notorious for bad CCFLs; I picked up one of these for free myself awhile back. I wouldn't touch Sanyo LCD TVs: https://www.badcaps.net/forum/showthread.php?t=23280
      Last edited by capkid; 06-23-2013, 07:47 PM.
      LG Plasma Mal-Discharge Correction Service

        Comment

        • kevinm34232
          Badcaps Legend
          • May 2012
          • 1884
          • USA
          #3
          Re: Sanyo DP42848 No Backlights

          Did you check 2 white 4A fuses on inverter board yet?

          Not sure if you can bypass a bad bulb in this design like in the this video, maybe someone else would know..

          https://www.youtube.com/watch?v=oE6K4xBVweA

            Comment

            • landyboy
              Badcaps Veteran
              • Apr 2013
              • 443
              • USA
              #4
              Re: Sanyo DP42848 No Backlights

              Kept searching the forum after I posted and found another thread. I thought I checked all the fuses but missed one on the main inverter board that was bad. Replaced and now it works!!

                Comment

                • landyboy
                  Badcaps Veteran
                  • Apr 2013
                  • 443
                  • USA
                  #5
                  Re: Sanyo DP42848 No Backlights

                  Kevin it was actually the small fuse marked 15 on the main inverter board.

                    Comment

                    • kevinm34232
                      Badcaps Legend
                      • May 2012
                      • 1884
                      • USA
                      #6
                      Re: Sanyo DP42848 No Backlights

                      OK, now run it for awhile before you put it back together to make sure no other underlying problem..

                        Comment

                        • landyboy
                          Badcaps Veteran
                          • Apr 2013
                          • 443
                          • USA
                          #7
                          Re: Sanyo DP42848 No Backlights

                          Will do thanks!

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA
                              #8
                              Re: Sanyo DP42848 No Backlights

                              Very common failure for the CMO inverter board, the fuse is for powering the PWM IC.
                              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

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