Sanyo DP42840-01 Dead No Standby

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  • kevinm34232
    Badcaps Legend
    • May 2012
    • 1884
    • USA
    #1

    Sanyo DP42840-01 Dead No Standby

    I can't figure out what's wrong with this board. There is no 5VSTBY. I have 170VDC on the main caps. No VCC to IC601. Replaced IC601 and IC602, still dead. Checked all the resistors and diodes in the area that I can find. Any help?
    Attached Files
    Tags: None
    • kevinm34232
      Badcaps Legend
      • May 2012
      • 1884
      • USA
      #2
      Re: Sanyo DP42840-01 Dead No Standby

      This one opto D607 that is reversed, is part of a AC DETECT circuit?
      Attached Files

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8150
          • Canada
          #3
          Re: Sanyo DP42840-01 Dead No Standby

          So you got no 5v on that ribbon connector on the bottom right? Can we have a pic of that (pinouts)?

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8150
              • Canada
              #4
              Re: Sanyo DP42840-01 Dead No Standby

              pictures are to blurry to read anything off.

                Comment

                • kevinm34232
                  Badcaps Legend
                  • May 2012
                  • 1884
                  • USA
                  #5
                  Re: Sanyo DP42840-01 Dead No Standby

                  Here you go

                  I also found this older thread. But again, no VCC on pin 5 of IC601.

                  https://www.badcaps.net/forum/showth...ht=sanyo+ic601
                  Attached Files
                  Last edited by kevinm34232; 02-15-2015, 09:36 AM.

                    Comment

                    • kevinm34232
                      Badcaps Legend
                      • May 2012
                      • 1884
                      • USA
                      #6
                      Re: Sanyo DP42840-01 Dead No Standby

                      BTW SM is available here with power schematic on page 47

                      Attached Files
                      Last edited by kevinm34232; 02-15-2015, 11:01 AM.

                        Comment

                        • cliff_hootarski
                          Badcaps Veteran
                          • Jul 2006
                          • 411
                          • USA
                          #7
                          Re: Sanyo DP42840-01 Dead No Standby

                          Check R606,623,624,625 for proper resistance.

                            Comment

                            • kevinm34232
                              Badcaps Legend
                              • May 2012
                              • 1884
                              • USA
                              #8
                              Re: Sanyo DP42840-01 Dead No Standby

                              R606 reads about 1.4 ohms
                              R623,624,625 each read about 540k ohms

                              The 170V is getting to pin 1 of T601. But no VCC. Should I have voltage on the FB pin?
                              Last edited by kevinm34232; 02-15-2015, 03:39 PM.

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA
                                  #9
                                  Re: Sanyo DP42840-01 Dead No Standby

                                  What Voltage do you have on pin 2 (Brown out protection)?
                                  Notes: Negative leg of the main filter cap is the GND for your meter.
                                  Also check those 1M resistors R607, 608, 609.
                                  The startup Voltage on VCC (pin 5) is 15.3V but it will not startup if the Brown out is detected.
                                  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

                                    • kevinm34232
                                      Badcaps Legend
                                      • May 2012
                                      • 1884
                                      • USA
                                      #10
                                      Re: Sanyo DP42840-01 Dead No Standby

                                      The voltage is 6.3V on the BR pin.

                                        Comment

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