Samsung 32" ln32b360c5d

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Samsung 32" ln32b360c5d

    Can you post a picture of the bottom of the board? You can determine which windings go where by looking at the schematic, usually.
    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

    • Peale
      Senior Member
      • Apr 2009
      • 96

      #22
      Re: Samsung 32" ln32b360c5d

      All of the photos of the boards are here:

      https://www.badcaps.net/forum/showpo...37&postcount=2

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Samsung 32" ln32b360c5d

        OK, it is very rare for a transformer to fail, but here is how I expect the windings to appear shorted.
        Attached Files
        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

        • Peale
          Senior Member
          • Apr 2009
          • 96

          #24
          Re: Samsung 32" ln32b360c5d

          Either I'm doing it wrong, or it's very, very shorted. Every one of those points appears shorted. But, wouldn't that not allow the TV to operate, at all?

          I'd been talking about the inverter transformers, above. Those I finally figured out, and they read: 1.073, 1.076, 1.043, .993

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #25
            Re: Samsung 32" ln32b360c5d

            Nope, it should be shorted.

            An inductor (which is basically what a transformer tap is), should always appear shorted.

            You need a ring tester to verify the transformer turns are not shorted. However, this is very rare with SMPS transformers.
            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

            • Peale
              Senior Member
              • Apr 2009
              • 96

              #26
              Re: Samsung 32" ln32b360c5d

              I understand now, I think. You were looking to see if any of them were open?

              Okay, on to the next thing - now what?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: Samsung 32" ln32b360c5d

                I missed most of this thread. Tell me, are 5.3V and 13V are stable on the PSU outputs?

                If the Power ON/OFF line is changing, then this could be the main board shutting down the PFC, causing the problem.
                http://www.tgohome.com/ServiceManual...g_BN44-00289A_[SCH].pdf

                The +13V powers the inverter, so it must be stable.
                Last edited by tom66; 01-01-2013, 08:17 AM.
                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

                • Peale
                  Senior Member
                  • Apr 2009
                  • 96

                  #28
                  Re: Samsung 32" ln32b360c5d

                  If I've metered correctly, 5.3V is stable, as is 13V. The DET_5V goes from 4.74V to nearly zero when it starts flashing on and off.

                  Comment

                  • Peale
                    Senior Member
                    • Apr 2009
                    • 96

                    #29
                    Re: Samsung 32" ln32b360c5d

                    Though 5.3 is reading closer to 5.24.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: Samsung 32" ln32b360c5d

                      OK, near each inverter transformer there should be some ceramic caps (coupling capacitors), C1803, CI808, CI817, CI825 which should all read open on 2000 ohms.
                      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

                      • Peale
                        Senior Member
                        • Apr 2009
                        • 96

                        #31
                        Re: Samsung 32" ln32b360c5d

                        Yes, this is accurate. All reading open. If I put the meter on 2M I get a reading, but not until then.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #32
                          Re: Samsung 32" ln32b360c5d

                          So if DET_5V is dropping out, check if the output of the LM358, UI802, pin #1, is high. If so, it might indicate that the driver detect circuit is detecting a stuck output.
                          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

                          • Peale
                            Senior Member
                            • Apr 2009
                            • 96

                            #33
                            Re: Samsung 32" ln32b360c5d

                            If I've done it correctly (black lead to ground, red lead to pin 1) then I'm getting nearly nothing. There was a sudden spike up to ~3.2V, but then that was gone, too.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #34
                              Re: Samsung 32" ln32b360c5d

                              Problem is, I do not know if DET_5V should be high or low. The only way to be sure would be to disable the error detection -- force it at 5V or 0V -- and see what happens. Do you want to try that?
                              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

                              • Peale
                                Senior Member
                                • Apr 2009
                                • 96

                                #35
                                Re: Samsung 32" ln32b360c5d

                                I'm assuming a possible risk would be blowing the board?

                                Run a jumper from the harness to that pin?

                                When it's at zero, which is where it starts, wouldn't that be...well...zero?

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #36
                                  Re: Samsung 32" ln32b360c5d

                                  I don't think there's a risk of blowing up anything on the board. The trouble is that you'll have to cut one of the wires on the harness going to the main board, which could be tricky.
                                  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

                                  • Peale
                                    Senior Member
                                    • Apr 2009
                                    • 96

                                    #37
                                    Re: Samsung 32" ln32b360c5d

                                    It would be easier to slice the trace, instead. Easier to repair, also.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #38
                                      Re: Samsung 32" ln32b360c5d

                                      You could do that. Then use a 100~470 ohm resistor to pull it to 5.3V, see if the set turns on, if not, try GND, through 100~470 ohms.
                                      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

                                      • Peale
                                        Senior Member
                                        • Apr 2009
                                        • 96

                                        #39
                                        Re: Samsung 32" ln32b360c5d

                                        Okay, so...which trace should I cut, exactly?

                                        At what points should I be connecting the resistor?

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #40
                                          Re: Samsung 32" ln32b360c5d

                                          Cut the trace leading to the DET5V pin.
                                          Then connect DET5V (on the main board end) to 5V or GND using the resistor.
                                          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

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