Samsung SyncMaster 2693hm - Dead backlight

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  • ensign.fodder
    Member
    • Nov 2016
    • 25
    • USA

    #21
    Re: Samsung SyncMaster 2693hm - Dead backlight

    Originally posted by budm
    https://www.badcaps.net/forum/attach...0&d=1480973043
    https://www.badcaps.net/forum/attach...2&d=1480973043

    See those connectors? They have labels for each pin to tell us what they are for, so we need you to take DCV reading of each pin when the unit is plugged in but the power switch is not activated, then take the reading again after the power switch is activated.
    You MUST report the readings in the format that we can easily read by putting down the PIN NAME, and follow by the DCV readings, very simple request. Black probe of the meter is on GND pin.
    Easy to do and thanks for the information. On the way to get the multi-meter.

    To confirm power is connected to power unit but no other connections. Testing on CNM802, CNM803, and CNM801 with power on and with power off but main still connected.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Samsung SyncMaster 2693hm - Dead backlight

      We need the readings with everything all connected.
      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

      • ensign.fodder
        Member
        • Nov 2016
        • 25
        • USA

        #23
        Re: Samsung SyncMaster 2693hm - Dead backlight

        Originally posted by budm
        We need the readings with everything all connected.
        So pull values off the backside of the connector pins while up and running and also plugged in but off?

        OK - thanks

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Samsung SyncMaster 2693hm - Dead backlight

          Correct.
          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

          • ensign.fodder
            Member
            • Nov 2016
            • 25
            • USA

            #25
            Re: Samsung SyncMaster 2693hm - Dead backlight

            Originally posted by budm
            Correct.
            OK - problem is getting everything connected and powered without shorting.

            Since power and control board mount to inside of a back cover piece, I will need to have a non-conductive material insulator to place under the boards.

            Will try to get measurements on Monday.

            Thanks

            Comment

            • ensign.fodder
              Member
              • Nov 2016
              • 25
              • USA

              #26
              Re: Samsung SyncMaster 2693hm - Dead backlight

              Results as promised, just not when promised.
              Meter @ 200 VDC
              Code:
              	On PSU - To E-PASS Board 		On PSU - To Inverter Board 	
              PWR ON/OFF	3.2	BL/ON		4.8	24 V		15.2			
              ST_BY		5.2	SOS		0.2	24 V		15.2			
              GND		0	DIMMING		0.3	24 V		15.2			
              GND		0	STATUS		5.1	24 V		15.2			
              GND		0	24 V DET	3.1	24 V		15.2			
              18 V		11.2				GND		0			
              18 V		11.2				GND		0			
              18 V		11.2				GND		0			
              GND		0				GND		0			
              GND		0				GND		0			
              GND		0				SOS		0.2			
              5.3 V		5.2				BL/ON		4.8			
              5.3 V		5.2				DIMMING		0.3			
              5.3 V		5.2				STATUS		5.1			
              NC		0									
              NC		0

              Comment

              • ensign.fodder
                Member
                • Nov 2016
                • 25
                • USA

                #27
                Re: Samsung SyncMaster 2693hm - Dead backlight

                Did confirm that power light on front is still working and that no backlight is being provided. My guess is that the low 18 V and 24 V are the problem so the PSU while looking good is not outputting the needed voltage. Open to being wrong.
                Thoughts?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Samsung SyncMaster 2693hm - Dead backlight

                  You do have 18V/24V power supply problem.
                  You need to check the CAPACITANCE of CM824.
                  BTW, so C202 i ripped off the board?
                  https://www.badcaps.net/forum/attach...2&d=1481341030
                  Last edited by budm; 02-09-2017, 10:48 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

                  • ensign.fodder
                    Member
                    • Nov 2016
                    • 25
                    • USA

                    #29
                    Re: Samsung SyncMaster 2693hm - Dead backlight

                    Originally posted by budm
                    BTW, so C202 i ripped off the board?
                    https://www.badcaps.net/forum/attach...2&d=1481341030
                    Not sure what you are asking or stating regarding this but let me know if there is another issue looming or I need to be aware of after the CAPACITANCE of CM824.

                    Thanks for all the help.

                    Comment

                    • ensign.fodder
                      Member
                      • Nov 2016
                      • 25
                      • USA

                      #30
                      Re: Samsung SyncMaster 2693hm - Dead backlight

                      Originally posted by budm
                      You do have 18V/24V power supply problem.
                      You need to check the CAPACITANCE of CM824.
                      From the Sticky on troubleshooting:
                      1) Bad Capacitors
                      --------------------

                      Capacitors die from age, heat, and shoddy build quality. Capacitors DO NOT have to be visibly bad in order to bad. They can be out
                      of tolerance uF (a 1000uF outputs 400uF) and high ESR (ohm). A multimeter will be insufficient to test for ESR. You need an ESR tester for test for ESR.
                      Not having an ESR is replacing it really the only way to go or should I toss in the towel and call it quits? If replacing is no worse then other Caps then let me know what I should be looking to buy?

                      Thanks again.
                      Attached Files

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: Samsung SyncMaster 2693hm - Dead backlight

                        That cap only needs to be tested for capacitance.
                        You can buy an new board if you do not want to buy more tool or just replace cap and see if it will fix the problem or not.
                        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

                        • ensign.fodder
                          Member
                          • Nov 2016
                          • 25
                          • USA

                          #32
                          Re: Samsung SyncMaster 2693hm - Dead backlight

                          Originally posted by budm
                          That cap only needs to be tested for capacitance.
                          You can buy an new board if you do not want to buy more tool or just replace cap and see if it will fix the problem or not.
                          I am happy to replace the cap presuming it is not a problem to find and remove. I just did not know how to test and the limited use of buying tester going forward was my hesitation.

                          Anyway, if cap is replaced and still not working would I need to test more caps? I ask since the ESR is not crazy expensive so if I need it I can get one.

                          Thanks again.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Samsung SyncMaster 2693hm - Dead backlight

                            One think I forget to ask you to check is the DCV between the two legs of the main filter cap (the 450vdc large cap laying on its side), it should have about 380~400vdc.
                            Be real careful since it is in the hot side of the circuit.
                            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

                            • ensign.fodder
                              Member
                              • Nov 2016
                              • 25
                              • USA

                              #34
                              Re: Samsung SyncMaster 2693hm - Dead backlight

                              Originally posted by budm
                              One think I forget to ask you to check is the DCV between the two legs of the main filter cap (the 450vdc large cap laying on its side), it should have about 380~400vdc.
                              Be real careful since it is in the hot side of the circuit.
                              It registered ~312vdc and CM824 ~157vdc.

                              Let me know next steps and thanks again.

                              Comment

                              • ensign.fodder
                                Member
                                • Nov 2016
                                • 25
                                • USA

                                #35
                                Re: Samsung SyncMaster 2693hm - Dead backlight

                                @budm - If you have given up on this thread (understandable) let me know.

                                Thanks

                                Comment

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