Samsung LCD TV Power Supply BN44-00438B

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  • liomendonca
    Member
    • Oct 2014
    • 10
    • Trinidad and Tobago
    #21
    Re: Samsung LCD TV Power Supply BN44-00438B

    ok I have gone back and checked the PS_ON and it seems to be Ok
    TV off LED ON PS_ON is 3.5v
    TV on LED OFF PS_ON is 0 V
    Capacitor stays at 160v with TV on or off
    As long as 110 plugged in capacitor 160V
    Maybe after a few hours it should discharge to zero even with 110 plugged in?
    You said if PS_ON is OK then it is definitely Power Supply
    Still need photos?
    If you do hope my photography is up to mark
    Thanks again

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA
        #22
        Re: Samsung LCD TV Power Supply BN44-00438B

        At this point you do have power supply problem due to the PFC Voltage booster is not running when PS_ON is present.
        The 160V will always there as long as the TV is plugged in so the standby power supply can run.
        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

          • liomendonca
            Member
            • Oct 2014
            • 10
            • Trinidad and Tobago
            #23
            Re: Samsung LCD TV Power Supply BN44-00438B

            OK so at this stage should I order the power supply or is it likely that I can repair it with my limited knowledge A quick question. Why do guys like you spend all this time and effort to help people
            Do you gain anything besides satisfaction?
            If we stop here then thamks again

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA
                #24
                Re: Samsung LCD TV Power Supply BN44-00438B

                1) I like to learn and keep up with new technologies (I worked in many fields of electronics).
                2) Keep the stuff off the landfill. I do my volunteer works once a week at Electronics recycle so I get to see the inside of the products and figure how it works and how they are put together. Hands on is the best thing for learning.
                3) I use the knowledge of what I see and learn here and from lots of people and lots of other places to see how products are made so i can improve what I design into the products.
                4) It is fun.
                Last edited by budm; 11-18-2014, 03:01 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

                  • liomendonca
                    Member
                    • Oct 2014
                    • 10
                    • Trinidad and Tobago
                    #25
                    Re: Samsung LCD TV Power Supply BN44-00438B

                    OK I am now stuck as I have been bitten by the "repair" bug. In my younger days I built I think every Heathkit so now nostalgia has set in. But I must be able to find the schematic for the BN4400438B. Is the BN4400438A similar? Any schematic for that?

                      Comment

                      • liomendonca
                        Member
                        • Oct 2014
                        • 10
                        • Trinidad and Tobago
                        #26
                        Re: Samsung LCD TV Power Supply BN44-00438B

                        Just thought of the possibility of using a separate power supply to power the backlights?

                          Comment

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