Sanyo DP50747 No 5vdc LJ44-00132A

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  • Ltank
    Badcaps Veteran
    • Jun 2013
    • 776
    • USA
    #1

    Sanyo DP50747 No 5vdc LJ44-00132A

    Set is dead. FS 181 a 250v 8 amp fuse. Set played fine a few minuets the turned off when the 5vdc dropped out, thus killing the 5vdc that energizes the relays the feed 120vac to rest of the P.S. FS 181 fuse is still good it did not blow it. I found no shorts in the primary side.
    Removed power supply to bench. No 5vdc Stby on pins 1 or2. I place a jumper from CN8002 pin 1 to pin 7, of course with no 5vdc the PS is dead. I got two TV case history books that show symptoms and cures but the capacitor numbers don't match the parts in the downloaded manual!
    Does anyone have a schematic for LJ44-00132A ? IC U974 KA393A only has 5.2vdc on pin no 8. nothing on the other pins. IC U661 KA3883 has no voltage on any pins. the caps C670 and C961 are 10uf 50vdc elec caps. show about 1.4 ohms in circuit. My new Panasonic 10uf 50v caps read 2 ohms on the
    Cap Wizard when out of circuit? Caps or the IC chips?
    Thanks
    Tags: None
    • Ltank
      Badcaps Veteran
      • Jun 2013
      • 776
      • USA
      #2
      Re: Sanyo DP50747 No 5vdc LJ44-00132A

      Pics of P.S. and led 2002 that was flashing when set was working for a few minutes
      Attached Files

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8214
          • Canada
          #3
          Re: Sanyo DP50747 No 5vdc LJ44-00132A

          So you are saying that your STBY voltage is gone and thus the TV died? What about the other fuse on the PSU (there are 2)
          Did you check the STBY voltage to GND pin on both boards, maybe there is a short? You are correct, if you don't have 5V STBY, than nothing is going to happen on that PSU. It will not turn on.
          Last edited by CapLeaker; 10-01-2015, 04:47 AM.

            Comment

            • Ltank
              Badcaps Veteran
              • Jun 2013
              • 776
              • USA
              #4
              Re: Sanyo DP50747 No 5vdc LJ44-00132A

              The set was playing, had the 5vdc, 207vdc etc. Then it shut down and all power was lost including the 5vdc standby. The relays that give 120 vac to the primary of the P.S. are marked 5vdc.

                Comment

                • Ltank
                  Badcaps Veteran
                  • Jun 2013
                  • 776
                  • USA
                  #5
                  Re: Sanyo DP50747 No 5vdc LJ44-00132A

                  Both fuses are good. I measured several kohms on the 5vdc to chasing gnd.

                    Comment

                    • retiredcaps
                      Badcaps Legend
                      • Apr 2010
                      • 9271
                      #6
                      Re: Sanyo DP50747 No 5vdc LJ44-00132A

                      This ebay auction

                      http://www.ebay.com/itm/221801254696

                      suggests U110 might warrant some investigation?

                      What part number is on U110?
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                        Comment

                        • CapLeaker
                          Leaking Member
                          • Dec 2014
                          • 8214
                          • Canada
                          #7
                          Re: Sanyo DP50747 No 5vdc LJ44-00132A

                          is that your power supply? http://assets.shopjimmy.com/media/ca...132a-top_2.jpg

                          When you plug in your board, do you get 170V on the filter cap?

                            Comment

                            • Ltank
                              Badcaps Veteran
                              • Jun 2013
                              • 776
                              • USA
                              #8
                              Re: Sanyo DP50747 No 5vdc LJ44-00132A

                              I get 380 vdc on main filter cap when the set works as does the 207 vdc on VS. When the 5vdc dies so does the set. I get 0vdc on main filter cap at that time because it kills the 120 vac to the primary of the P.S. The two relays are 5vdc.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA
                                  #9
                                  Re: Sanyo DP50747 No 5vdc LJ44-00132A

                                  "I place a jumper from CN8002 pin 1 to pin 7"
                                  I look at the board, the pin 1 for 5V is labeled as 5VD, that is a switched 5V.
                                  The standby '5Vsb' is at CN8003. So check and see if you do have 5Vsb at that pin.
                                  Too bad shopjimmy picture of the bottom side of the board has a big white sticker on it so I cannot see the traces to verify the connections.
                                  Pictures provided by SHOPJIMMY.
                                  Attached Files
                                  Last edited by budm; 10-01-2015, 09:37 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

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