Sanyo DP32648 Backlight on/off

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  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA
    #1

    Sanyo DP32648 Backlight on/off

    Sanyo DP32648 Push power and LED on front turns green then the backlight flashes on then goes out. Visually caps look good and I see no hot spots or anything out of the normal. I checked each inverter on the board with a test bulb and all looked fine so I would say not inverter or bulbs so something making it go into protect mode.But what to check next?
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    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Sanyo DP32648 Backlight on/off

      DARFON inverter, so check the transformer secondaries using your multimeter's 20kohm range. With TV unplugged place meter across outer lower two terminals of transformer. Record reading for each.

      Any reading substantially different from any other reading indicates a bad transformer, which can be replaced, they are about $15 each on eBay.
      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

        • CraigR
          Badcaps Veteran
          • Dec 2013
          • 959
          • USA
          #3
          Re: Sanyo DP32648 Backlight on/off

          I thought testing each transformer with a test bulb would show a bad one??

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Sanyo DP32648 Backlight on/off

              Not necessarily - if your bulb requires less drive than the panel one it won't show a partially bad transformer.
              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

                • CraigR
                  Badcaps Veteran
                  • Dec 2013
                  • 959
                  • USA
                  #5
                  Re: Sanyo DP32648 Backlight on/off

                  Well just checked them all and all are about the same.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: Sanyo DP32648 Backlight on/off

                      Possibly a bad bulb in the panel then.
                      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

                        • CraigR
                          Badcaps Veteran
                          • Dec 2013
                          • 959
                          • USA
                          #7
                          Re: Sanyo DP32648 Backlight on/off

                          Doubt it since I tried a bulb on every transformer and I got the one with a bad bulb then TV would have stayed lit. Make that 2 size bulbs tested on every one.

                            Comment

                            • CraigR
                              Badcaps Veteran
                              • Dec 2013
                              • 959
                              • USA
                              #8
                              Re: Sanyo DP32648 Backlight on/off

                              My bad tom66, I took another meter (el cheapo) and did find a bad transformer.

                                Comment

                                • CraigR
                                  Badcaps Veteran
                                  • Dec 2013
                                  • 959
                                  • USA
                                  #9
                                  Re: Sanyo DP32648 Backlight on/off

                                  Got another board and that fixed it! Thanks tom66.

                                    Comment

                                    • zman6
                                      New Member
                                      • Jan 2015
                                      • 9
                                      • United States
                                      #10
                                      Re: Sanyo DP32648 Backlight on/off

                                      CraigR I have the same problem that you had same model which board did you replace the one with the inuts or the tan board in your second picture? Thanks

                                        Comment

                                        • CraigR
                                          Badcaps Veteran
                                          • Dec 2013
                                          • 959
                                          • USA
                                          #11
                                          Re: Sanyo DP32648 Backlight on/off

                                          the green inverter board.

                                            Comment

                                            • zman6
                                              New Member
                                              • Jan 2015
                                              • 9
                                              • United States
                                              #12
                                              Re: Sanyo DP32648 Backlight on/off

                                              So the board in your first picture? Sorry I am new to this.and would like to try to fix it before I purchase a new one. Thanks

                                                Comment

                                                • CraigR
                                                  Badcaps Veteran
                                                  • Dec 2013
                                                  • 959
                                                  • USA
                                                  #13
                                                  Re: Sanyo DP32648 Backlight on/off

                                                  Last pic.

                                                    Comment

                                                    • zman6
                                                      New Member
                                                      • Jan 2015
                                                      • 9
                                                      • United States
                                                      #14
                                                      Re: Sanyo DP32648 Backlight on/off

                                                      Ok thanks

                                                        Comment

                                                        • zman6
                                                          New Member
                                                          • Jan 2015
                                                          • 9
                                                          • United States
                                                          #15
                                                          Re: Sanyo DP32648 Backlight on/off

                                                          By chance CraigR do you still have your old board or the transformers from it? I found 1 bad one on mine and was unable to fund it online.

                                                            Comment

                                                            • budm
                                                              Badcaps Legend
                                                              • Feb 2010
                                                              • 40746
                                                              • USA
                                                              #16
                                                              Re: Sanyo DP32648 Backlight on/off

                                                              http://lcdparts.net/TransformerDetai...ProductID=2771

                                                              4013Lxxxx
                                                              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

                                                                • dehrhard
                                                                  New Member
                                                                  • Sep 2015
                                                                  • 5
                                                                  • USA
                                                                  #17
                                                                  Re: Sanyo DP32648 Backlight on/off

                                                                  Hey folks, got a question.

                                                                  I was checking the resisitance of the tranformers on the inverter board and found some variances. My question, is it enough to call a transformer "bad"?

                                                                  The secondaries varied from
                                                                  1.078 K to 1.093 K

                                                                  The primaries varied very little.
                                                                  0.15 to 0.16 ohms

                                                                  Thoughts?

                                                                    Comment

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