Samsung LN46D630M3F, TV powers on, sound works but no backlight

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA
    #81
    Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

    As you can see, the circuit is very sensitive (Triming the 38.8K with 2M resistor) and they set the output Voltage by trimming the Total resistance of two resistors, so as long as you get the output Voltage to be around 380~390V range then you will be OK, i would try to get the resistance toward higher Value than lower value. What is the next up value of 38K 1% available at digikey?
    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

      • Five_magics
        Member
        • Apr 2016
        • 47
        • Canada
        #82
        Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

        Originally posted by budm
        As you can see, the circuit is very sensitive (Triming the 38.8K with 2M resistor) and they set the output Voltage by trimming the Total resistance of two resistors, so as long as you get the output Voltage to be around 380~390V range then you will be OK, i would try to get the resistance toward higher Value than lower value. What is the next up value of 38K 1% available at digikey?
        As a single resistor, there are 38,3k 1% available. If I use resistors in parallel I can go with 56,2k with a 118k for a total of 38 068 ohm.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA
            #83
            Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

            You can try both setup and see.
            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

              • Five_magics
                Member
                • Apr 2016
                • 47
                • Canada
                #84
                Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

                Ordered everything (the caps, the resistors and the IC). Will report back whenever I receive everything.

                  Comment

                  • smuddge
                    Senior Member
                    • Feb 2012
                    • 96
                    • Canada
                    #85
                    Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

                    did anyone get to the bottom of this? I have the same problem as the original poster. just would like to know what I need to order to fix it.

                      Comment

                      • Flip_ep
                        New Member
                        • Feb 2017
                        • 2
                        • Canada
                        #86
                        Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

                        Any update on this havin the same problem. Picture sound good just no backlight. Inverter is good.

                          Comment

                          • Flip_ep
                            New Member
                            • Feb 2017
                            • 2
                            • Canada
                            #87
                            Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

                            Resoldring the joints fixed my problem. For backlight now working tv good so far.

                              Comment

                              • Louis82
                                Badcaps Veteran
                                • Feb 2012
                                • 240
                                • USA
                                #88
                                Re: Samsung LN46D630M3F, TV powers on, sound works but no backlight

                                Resoldering bad connections has worked only for a few days. Problem is back again. Any update in regards the solution for this.

                                Thanks

                                  Comment

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