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Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

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    Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

    I read a lot about bad caps on these TVS, but could a intermittent loss of picture be caused by caps? I will turn it on and sometimes it works fine, shut it off and turn it on later with no picture. No other symptoms like cracking or popping.

    Before, I tear into it and look for swelling caps, can caps fail like this?

    Thanks in advance,

    Bill


    #2
    Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

    Capacitors would not be a typical suspect with this problem. In a dark room, when the picture is gone, can you see a glow from the screen or not? (Backlight)
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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      #3
      Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

      I will check thanks. I am pretty sure it does not have a glow, but what would be if there isn't one?

      Thanks again.

      Comment


        #4
        Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

        T-con or main board w/ glowing screen.
        Inverter, power or main board w/o glowing screen.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment


          #5
          Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

          I made need a scope to check those things...

          Comment


            #6
            Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

            You usually won't for most LCD TVs, but it can help to have one.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment


              #7
              Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

              The tv is working great tonight. Go figure.

              Comment


                #8
                Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                I tried the TV this morning and the screen is blank, no backlight and sound is working. Now what?

                Comment


                  #9
                  Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                  Take the cover off, and provide clear pictures of each of the boards in the TV.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment


                    #10
                    Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                    Ok, will do.

                    Comment


                      #11
                      Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                      Here you go. I do not see bulging caps anywhere.
                      Attached Files
                      Last edited by Wnowickiz; 07-07-2013, 01:41 PM.

                      Comment


                        #12
                        Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                        Second pic.
                        Attached Files

                        Comment


                          #13
                          Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                          replace all secondary caps and resolder everything attached to a heatsink on that power supply.
                          that is not an led set either.
                          i see these often.

                          Comment


                            #14
                            Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                            Ok, thanks. All the can style caps or the others also? Should take any readings prior?

                            Comment


                              #15
                              Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                              I tested all the diodes and transistors in circuit. DB851 and db803 appear bad (both directions). Could those be the cause? I am looking for a schematic for the BN44-00134D. Thanks again.

                              Comment


                                #16
                                Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                                Intermittent would be unlikely to be caused by a permanent failure.
                                Schematic of PSU if it's any help:
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment


                                  #17
                                  Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                                  You were correct tom66. The replacement diode did not fix anything. Should I test the voltages prior to changing out. All the caps? Thanks again.

                                  Comment


                                    #18
                                    Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                                    Yes, check all the voltages on the output side, in particular check the backlight on/off signal CN1803 pin 1.
                                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                    Comment


                                      #19
                                      Re: Samsung LED TV Model LN-S4041D intermittent loss of picture (sounds still works)

                                      Thanks.

                                      Comment

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