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

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  • tomstr
    Tommy
    • Jun 2010
    • 147
    • Usa

    #61
    Re: Sanyo dp42848. No picture no sound?has anyone found the problem

    Post 37 METER IN DIOD TEST RESULTS ON CIRCUIT-D240B- AND D-240A 217. IS THIS OK? THEN I PUT BLACK TEST LEAD ON LARGE SOLDER JOINT,AND RED ON LEFT SOLDER JOINT,AND THEN ON RIGHT SMALL SOLDER JOINT SAME READINGS ON BOTH CIRCUITS, 217 READINGS,WILL SENT PICS OF FLIP SIDE OF BOARD TO SHOW WHAT IM TESTING.

    Comment

    • tomstr
      Tommy
      • Jun 2010
      • 147
      • Usa

      #62
      Re: Sanyo dp42848. No picture no sound?has anyone found the problem

      HERE ARE THE CIRCUITS D240a D240b ARE WE WORKING ON THE RIGHT CIRCUITS?
      Attached Files

      Comment

      • tomstr
        Tommy
        • Jun 2010
        • 147
        • Usa

        #63
        Re: Sanyo dp42848. No picture no sound?has anyone found the problem

        Originally posted by johnboy1313
        my readings are listed in the link i provided. The tv is back together and hanging on the wall. I'm probably not going to take it down and open it back up until there is a fault of somekind. I don't know though, crazier things have happened.
        i can't find your link on the readings?

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #64
          Re: Sanyo dp42848. No picture no sound?has anyone found the problem

          "Ok again tested circuit t.1 set meter at 200 ohms NOT 200k ohms is 00.9 on 12-13 and 00.9 on 12-14 IS THAT WHAT YOU NEED?" OK, that is more like I expect from the transformer widings resistance, I do not know how you get 7.75 Ohms in the first place.
          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

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #65
            Re: Sanyo dp42848. No picture no sound?has anyone found the problem

            Post 62, yes, they are the two diode for the 24v POWER SUPPLY.

            Do you mean .217V as readout shown on the meter?
            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

              #66
              Re: Sanyo dp42848. No picture no sound?has anyone found the problem

              Originally posted by budm
              is the meter set to 2k ohms as shown in the picture, if it is that means it is showing 7.75k ohms (7750 ohms!).set it to '200' ohms range and take the reading again. I expect it to be less than one ohm. What resistance do you get when you short the meter leads together?
              Your meter does have diode mode.
              I also drew up simplified diagram, as you can see, there is not much for the 24vdc section at all.
              circuit-d210 meter in diod test- meter reading-181

              Comment

              • tomstr
                Tommy
                • Jun 2010
                • 147
                • Usa

                #67
                Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                [QUOTE=budm;287348]Post 62, yes, they are the two diode for the 24v POWER SUPPLY.

                Do you mean .217V as readout shown on the meter? NO METER IN DIOD TEST IS 217. NOT VOLTS

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #68
                  Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                  Well your meter must not be the same as most other meter, my FLUKE show 0.290V which represents the Forward voltage drop of 0.290V, but any way, that seems OK if I can believe your meter reading, the Forward voltage of your Diode is .217V.
                  Well I cannot see why you are not getting any 24v since the transformer is OK, the Didoe are OK, the 12v section is working.
                  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

                    #69
                    Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                    Well anything else you need ?are the diodes ok?

                    Comment

                    • tomstr
                      Tommy
                      • Jun 2010
                      • 147
                      • Usa

                      #70
                      Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                      Originally posted by budm
                      Well your meter must not be the same as most other meter, my FLUKE show 0.290V which represents the Forward voltage drop of 0.290V, but any way, that seems OK if I can believe your meter reading, the Forward voltage of your Diode is .217V.
                      Well I cannot see why you are not getting any 24v since the transformer is OK, the Didoe are OK, the 12v section is working.
                      REMEMBER CIRCUIT-d210 is meter in diode test 181 is that ok?

                      Comment

                      • tomstr
                        Tommy
                        • Jun 2010
                        • 147
                        • Usa

                        #71
                        Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                        Originally posted by budm
                        Well your meter must not be the same as most other meter, my FLUKE show 0.290V which represents the Forward voltage drop of 0.290V, but any way, that seems OK if I can believe your meter reading, the Forward voltage of your Diode is .217V.
                        Well I cannot see why you are not getting any 24v since the transformer is OK, the Didoe are OK, the 12v section is working.
                        OK ALSO CIRCUIT-q602-diode in meter-494 1420. Q-601 diode in meter reading-494-899 DOES THIS HELP?

                        Comment

                        • tomstr
                          Tommy
                          • Jun 2010
                          • 147
                          • Usa

                          #72
                          Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                          Originally posted by budm
                          well your meter must not be the same as most other meter, my fluke show 0.290v which represents the forward voltage drop of 0.290v, but any way, that seems ok if i can believe your meter reading, the forward voltage of your diode is .217v.
                          Well i cannot see why you are not getting any 24v since the transformer is ok, the didoe are ok, the 12v section is working.
                          i don't think i tested the tranformer?

                          Comment

                          • tomstr
                            Tommy
                            • Jun 2010
                            • 147
                            • Usa

                            #73
                            Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                            Budm if your still there?i have a question..

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #74
                              Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                              "Ok again tested circuit t.1 set meter at 200 ohms NOT 200k ohms is 00.9 on 12-13 and 00.9 on 12-14 IS THAT WHAT YOU NEED?" You already tested the transformer resistance, it is OK per your post 59
                              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

                                #75
                                Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                OH YES I TESTED THE CIRCUITS D240a and D240b D-120 METER AND 200 k ohms..HERE IS MY QUESTION IM GOING TO SEND YOU A PIC OF THE PINS I WAS TESTING WITH BOARD INSTALLED AND EVERYTHING PLUGGED IN,THIS WILL HELP YOU UNDERSTAND STEP BY STEP OF WHAT IM DOING OR DID. THIS IS WE'RE WE SHOULD START SO NO I MEAN NO MORE QUESTIONS AS TO WHAT I DID.SO I WILL SEND A PIC AND OTHERS TO GET UP TO DATE..

                                Comment

                                • tomstr
                                  Tommy
                                  • Jun 2010
                                  • 147
                                  • Usa

                                  #76
                                  Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                  IF YOU LOOK AT THIS PLUG YOU CAN SEE WERE IT SAYS 24v THE BOTTEM SAYS PSON STARTED AT THE TOP WAS NO RECIVING 24 volts WITH CONNECTOR PLUGGED IN I BACK PROBED WITH A SEWING NEEDLE?
                                  Attached Files

                                  Comment

                                  • tomstr
                                    Tommy
                                    • Jun 2010
                                    • 147
                                    • Usa

                                    #77
                                    Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                    STEP 2 ON THE LEFT SIDE YOU CAN SEE TWO PLUGS,UPPER LEFT I STARTED AT THE TOP PLUG NO 24V TO THIS PLUG ALSO,ONCE AGAIN WIRES PLUGGED IN AND NEEDLE TO BACK PROBE..SAME AT THE BOTTOM PLUG NO VOLTS. Here is a picture

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #78
                                      Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                      Please don't type in all caps -- it's quite hard to read.

                                      Anyway, I know some Delta power supplies of this generation used fuses on the output. I have seen a few of them. Both in Philips LCD TVs.

                                      It would be very rare for a power supply to fail to produce 24V, but still be able to produce the 12V, etc.

                                      Fuses will be marked like "F8A/32V" near them; can you see any?
                                      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

                                      • tomstr
                                        Tommy
                                        • Jun 2010
                                        • 147
                                        • Usa

                                        #79
                                        Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                        Here
                                        Attached Files

                                        Comment

                                        • tomstr
                                          Tommy
                                          • Jun 2010
                                          • 147
                                          • Usa

                                          #80
                                          Re: Sanyo dp42848. No picture no sound?has anyone found the problem

                                          Originally posted by tom66
                                          Please don't type in all caps -- it's quite hard to read.

                                          Anyway, I know some Delta power supplies of this generation used fuses on the output. I have seen a few of them. Both in Philips LCD TVs.

                                          It would be very rare for a power supply to fail to produce 24V, but still be able to produce the 12V, etc.

                                          Fuses will be marked like "F8A/32V" near them; can you see any?
                                          Sorry about caps old habbet!will check for fuse give me a few

                                          Comment

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