Sanyo dp42848. No picture no sound?has anyone found the problem

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  • tomstr
    Tommy
    • Jun 2010
    • 147
    • Usa

    #1

    Sanyo dp42848. No picture no sound?has anyone found the problem

    I have a Sanyo dp42848 no picture no sound,reading over all threads related model tvs,seems to be a pattern with this tv?my tv has no backlight on at all,has sound,flashlight shows image in background,HAS ANYONE FOUND FIX?i know that someone should have found something?thank you ....please let me know
  • drpj23
    Badcaps Veteran
    • May 2012
    • 528
    • USA

    #2
    Re: Sanyo dp42848. No picture no sound?has anyone found the problem

    Well you could be the one to resolve it. Do you have a meter to test with?

    If so, go through the post you replied on as a guide and verify voltages to the inverter including BL_ON (or BL_SW) and then (if voltages are good) check resistances on the inverter transformers.

    Comment

    • tomstr
      Tommy
      • Jun 2010
      • 147
      • Usa

      #3
      Re: Sanyo dp42848. No picture no sound?has anyone found the problem

      Will do i have a volt tester FROM WHAT. A REPAIR SHOP SAID ITS A BOARD PROBLEM OR WIRES INVERTOR?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Sanyo dp42848. No picture no sound?has anyone found the problem

        So you do not have any meter to at least check the 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

        • drpj23
          Badcaps Veteran
          • May 2012
          • 528
          • USA

          #5
          Re: Sanyo dp42848. No picture no sound?has anyone found the problem

          Well if you don't, you can probably find a cheap one at a local hardware store.

          And it could be inverter wires, CCFL, inverter board, power supply, or the main. The previous post will eliminate at least 2 of those choices. But since we don't have the TV physically on us, you are going to have to work with us if you want to fix it yourself.

          Comment

          • johnboy1313
            Badcaps Legend
            • Nov 2012
            • 1959
            • USA

            #6
            Re: Sanyo dp42848. No picture no sound?has anyone found the problem

            https://www.badcaps.net/forum/showthread.php?t=24040

            Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulbs.

            Comment

            • tomstr
              Tommy
              • Jun 2010
              • 147
              • Usa

              #7
              Re: Sanyo dp42848. No picture no sound?has anyone found the problem

              Yes i do have a digital meter

              Comment

              • tomstr
                Tommy
                • Jun 2010
                • 147
                • Usa

                #8
                Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                Originally posted by johnboy1313
                https://www.badcaps.net/forum/showthread.php?t=24040

                Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulbs.
                Well my tv has no picture at all its just black and with a flashlight i see a picture !seems to me if it lights for a few seconds then its a diffrent problem

                Comment

                • tomstr
                  Tommy
                  • Jun 2010
                  • 147
                  • Usa

                  #9
                  Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                  Well I don't think I'm getting 24 volts from my power supply to my invertors.if I'm testing the right wires.

                  Comment

                  • drpj23
                    Badcaps Veteran
                    • May 2012
                    • 528
                    • USA

                    #10
                    Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                    Red probe on 24v rail (wire) and black probe on chassis or screw? Make sure the meter is set to DC volts (line with dotted lines) and battery ok?

                    The bulbs can still light if one is bad. The other working bulbs will light for a second or two then circuitry will detect the broken bulb and shut the inverter off. You will sometimes hear a buzz by the inverter board before it shuts off.

                    Comment

                    • tomstr
                      Tommy
                      • Jun 2010
                      • 147
                      • Usa

                      #11
                      Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                      What is the rail wire?i unplugged the wire on the power supply upper left at top of power supply,the power supply Board read 24v so I probed that pin. No volts the wire that goes to that pin is white and goes to the invertor, tried on the slave invertor same thing,the other wires show lower voltage like 4.75. But no 24 volts with the tv on plugged in?so if I'm doing it right IS THE POWER SUPPLY TO BLAME?ok will wait up tonight for your reply, thanks
                      Last edited by tomstr; 11-27-2012, 11:14 PM.

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                        You can also check the 24vdc right at the white fuse on the inverter board.
                        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

                        • tomstr
                          Tommy
                          • Jun 2010
                          • 147
                          • Usa

                          #13
                          Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                          [QUOTE=johnboy1313;286810]https://www.badcaps.net/forum/showthread.php?t=24040

                          Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulbs.[/QUOT NO VOLTS AT THS FUSE

                          Comment

                          • tomstr
                            Tommy
                            • Jun 2010
                            • 147
                            • Usa

                            #14
                            Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                            [QUOTE=tomstr;286921][QUOTE=johnboy1313;286810]https://www.badcaps.net/forum/showthread.php?t=24040

                            Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulb. I HAVE NO VOLTS AT THE WHITE FUSE

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                              OK, the 24v power supply is not working.
                              johnboy1313 posted the picture of the power supply board but did not show the closed up pictures of the 3 white connectors, we need to verify if the power supply is getting the PS_ON signal from the main board to turn on the 12v/24v power supply.
                              Can you post the pictures of the connectors?
                              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

                              • tomstr
                                Tommy
                                • Jun 2010
                                • 147
                                • Usa

                                #16
                                Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                Hope the pics help
                                Attached Files
                                Last edited by tomstr; 11-28-2012, 02:53 AM.

                                Comment

                                • tomstr
                                  Tommy
                                  • Jun 2010
                                  • 147
                                  • Usa

                                  #17
                                  Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                  Hope the pics help
                                  Attached Files
                                  Last edited by tomstr; 11-28-2012, 02:48 AM.

                                  Comment

                                  • drpj23
                                    Badcaps Veteran
                                    • May 2012
                                    • 528
                                    • USA

                                    #18
                                    Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                    What is the voltage on the first pin (PSON) of that connector (CN2) when turned on?

                                    Actually, listing the voltages at each pin when the TV is on might be helpful.
                                    Last edited by drpj23; 11-28-2012, 02:46 AM.

                                    Comment

                                    • tomstr
                                      Tommy
                                      • Jun 2010
                                      • 147
                                      • Usa

                                      #19
                                      Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                      I will reinstall the board in the morning in a couple hrs.i think the voltage is low what should it be?

                                      Comment

                                      • drpj23
                                        Badcaps Veteran
                                        • May 2012
                                        • 528
                                        • USA

                                        #20
                                        Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                        It should be >3v for PSON.

                                        Comment

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