Sanyo DP42849 - Power Supply Issues DPS-260LP

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  • wcsd106
    Senior Member
    • Jan 2015
    • 57
    • USA

    #1

    Sanyo DP42849 - Power Supply Issues DPS-260LP

    I picked up a cheap Sanyo LCD TV from Craigslist this week. It is a model DP42849.

    The TV will not power on and no standby LED is visible.

    With the power supply board pulled, I am not getting the 5v standby voltage at the multi pin connector.

    A voltage reading across the large 150uf/450v electrolytic capacitor on the primary side, shows that I am only getting 170v.

    The power supply board is a DPS-260LP.

    Seems like my problem is more than likely on my primary side.

    Any ideas?
  • wcsd106
    Senior Member
    • Jan 2015
    • 57
    • USA

    #2
    Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

    Pictures component/trace side of power supply board.
    Attached Files

    Comment

    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8135
      • Canada

      #3
      Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

      yep. force the psu on without the main board and see if all voltage rails come up

      Comment

      • wcsd106
        Senior Member
        • Jan 2015
        • 57
        • USA

        #4
        Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

        I have tested with the 5vsb pin shorted to the PS_ON pin. Still nothing. With or without the pins connected, I do not have the 5v that should be on the standby pin even when the PSU is off.

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8135
          • Canada

          #5
          Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

          so nothing at all on any of the pins? Be careful working on the primary side as there are lethal voltages. Check how much voltage you get on the main filter cap.

          Comment

          • wcsd106
            Senior Member
            • Jan 2015
            • 57
            • USA

            #6
            Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

            That's correct. Nothing at all on any of the pins.

            At the main filter cap, I am seeing approximately 170v.

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8135
              • Canada

              #7
              Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

              trace the stby voltage rail from the pin back to the secondary of the transformer. Check cap and diode. if that's all good, you have to check things on the primary side. So be very careful there. Kind of need to find a schematic, or you have to trace it.
              Look at D951 something drew a lot of current and it got hot.
              Last edited by CapLeaker; 08-21-2015, 06:21 AM.

              Comment

              • Chevyman204
                New Member
                • Apr 2015
                • 3
                • United States

                #8
                Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

                Don't mean to jump in but I think i have a ps problem as well. The ps board is the same as pictured above. My bl-on only has 2.4v I think it is suppose to have 3.3v. I can see picture after powered on for one second then it goes black, sound is good. I just so happen to have a second main board from another set that I tried to see if the main board was preventing the bl-on voltage to be low. There was minimal change in voltage. Gained .1v with second board.

                Not sure what to do next, would the bl-on voltage being low by 1 volt prevent the back lights from turning on?

                If I'm not following forum procedure please let me know cause I can start another post.

                I wish the other tv that works had the same ps board so I could just switch it to verify lights. I think the inverter boards are separate on the other set but the main boards are the same.

                Comment

                • jjaypops
                  New Member
                  • May 2013
                  • 2
                  • usa

                  #9
                  Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

                  Ever find out what was wrong chevyman204? I am having the same issue. Thanks

                  Comment

                  • ladywinn256
                    New Member
                    • Mar 2016
                    • 2
                    • USA

                    #10
                    Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

                    Originally posted by wcsd106
                    I picked up a cheap Sanyo LCD TV from Craigslist this week. It is a model DP42849.

                    The TV will not power on and no standby LED is visible.

                    With the power supply board pulled, I am not getting the 5v standby voltage at the multi pin connector.

                    A voltage reading across the large 150uf/450v electrolytic capacitor on the primary side, shows that I am only getting 170v.

                    The power supply board is a DPS-260LP.

                    Seems like my problem is more than likely on my primary side.

                    Any ideas?

                    Comment

                    • ladywinn256
                      New Member
                      • Mar 2016
                      • 2
                      • USA

                      #11
                      Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

                      Wondering if anyone has found or had this problem power supply board burns resistor R1 and R2 ???

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Sanyo DP42849 - Power Supply Issues DPS-260LP

                        http://www.shopjimmy.com/catalogsear...t/?q=DPS-260LP
                        LP or LPB?
                        R1 and R2 are the through hole 10M Ohms resistors as I can see in the pictures, is that right?
                        What is the board not doing?
                        Last edited by budm; 03-14-2016, 09:39 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

                        Comment

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