insignia ns50d40 dead

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  • ogtommy
    i don't know#@$
    • Nov 2015
    • 30
    • CANADA

    #21
    Re: insignia ns50d40 dead

    This is the best i got until my wife brings home slr from work. Any part not clear/ blurry ill redo
    Thnx again
    Attached Files

    Comment

    • ogtommy
      i don't know#@$
      • Nov 2015
      • 30
      • CANADA

      #22
      Re: insignia ns50d40 dead

      missed the point about the - side of the main filter cap. thanx for the heads up
      Last edited by ogtommy; 11-30-2017, 10:12 PM.

      Comment

      • ogtommy
        i don't know#@$
        • Nov 2015
        • 30
        • CANADA

        #23
        Re: insignia ns50d40 dead

        ok my OCD is kicking in so i retested from the - of the ripple cap to the diode and got 295v.
        zds1 cathode 22v
        zds11 cathode 1.8v
        safety resistor 0.045v

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: insignia ns50d40 dead

          http://www.shopjimmy.com/insignia-19...led-board.htm#
          Insignia 19.50S12.001 Power Supply / LED Board

          We need to find out if we do have VCC to run the SMPS IC for the switched 12V/LED power supply or not, you will have to work on the board with bottom side up and all connected and running, it will be very dangerous.
          We need to get the specification sheet of the SMPS IC UM1 first so we can find out which pin is the VCC pin, so look at the print on top of the IC and then look for the spec sheet.
          Pictures provided by shopjimmy.
          Attached Files
          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

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #25
            Re: insignia ns50d40 dead

            Originally posted by ogtommy
            ok my OCD is kicking in so i retested from the - of the ripple cap to the diode and got 295v.
            zds1 cathode 22v
            zds11 cathode 1.8v
            safety resistor 0.045v
            No need to mess with that 5VSTBY section, it is working otherwise you will not have the 5V per your report.
            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

            • ogtommy
              i don't know#@$
              • Nov 2015
              • 30
              • CANADA

              #26
              Re: insignia ns50d40 dead

              http://pdf1.alldatasheet.com/datashe.../SSC9522S.html
              this is what i found. so from pin 2 vcc to pin 4 gnd there was 0volts. also went from pin 2 to pin10 (control ground) 0v. also tried - on filter cap to vcc once again 0 v.

              Comment

              • ogtommy
                i don't know#@$
                • Nov 2015
                • 30
                • CANADA

                #27
                Re: insignia ns50d40 dead

                btw those are some really nice pics off shopjimmy you found!! ive been trying for 30 minutes to take clear pics on my s8 and always some dark blurry spots!!

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: insignia ns50d40 dead

                  You are testing it with all the boards connected and the PS-ON is present, right?
                  Attached Files
                  Last edited by budm; 11-30-2017, 11:07 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

                  • ogtommy
                    i don't know#@$
                    • Nov 2015
                    • 30
                    • CANADA

                    #29
                    Re: insignia ns50d40 dead

                    yes. ac plug in wall, connector to logic board plugged in, connector to led board in. dim dim red light on. stby 5v present etc etc

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: insignia ns50d40 dead

                      OK, the next hard part is to locate the switched transistor that is turned on the PS-ON signal so it will supply the VCC to that SMPS IC.
                      Board tracing will be required at this point by tracing back from the VCC pin to see where it goes to.
                      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

                      • ogtommy
                        i don't know#@$
                        • Nov 2015
                        • 30
                        • CANADA

                        #31
                        Re: insignia ns50d40 dead

                        so i traced it to a cap and a zero shunt resistor to a transitor. one side to ts1 and the other to optocoupler um4
                        let me know if i did it right or if i should take it further
                        tommy
                        Attached Files

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA

                          #32
                          Re: insignia ns50d40 dead

                          I did not have a chance to trace the board yet, but the typical set up is the PS-ON will turn on a transistor that drive the LED side of the OPTO, the Photo transistor in the OPTO is then turned on, that photo transistor then will provide the current path to bias on the switched Transistor to allow the rectified Voltage from the Aux winding of the 5VSTBY transformer to run the SMPS IC. So one pin (Emitter or the Collector) of the transistor (it can be either PNP or NPN) should have 15~20V all the time and when the bias is applied to turn on the Transistor then you should have the Voltage on the Emitter or the Collector.
                          So just check the E-B junction Voltage (around 0.6~0.7V) to see if it is present or not when PS-ON is present.
                          Last edited by budm; 12-01-2017, 01:12 AM.
                          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

                          • ogtommy
                            i don't know#@$
                            • Nov 2015
                            • 30
                            • CANADA

                            #33
                            Re: insignia ns50d40 dead

                            so heres something weird. I was going to start tracing the other side of optocouplers and check voltages when i realized pushing the connector to logic board in on an angle turned on all the powersupplies. as soon as i put the rest of the connector in (the gnd pins) the tv/baclight turned off. i also started probing on the logic board side to make sure there wasn't a fused or broken via for the ground plane when i noticed the main ic on the logic board was HOT!! without a heatsink that has to be wrong. so it seems like the logic board has crapped out in my humble opinion. i design pc boards for stm32 microcontrollers and i have had the same exact situation multiple times. overcurrent blew the internal ldo of the microcontroller (or an analog signal pin) and fused it shut so it has a direct path to ground. I think im going to call this logic board shot and possibly convince my sister who has the same exact tv dissasemble hers and borrow her logic board.
                            budm, thanks for the help and relayer too. i appreciate all the effort you guys put in.
                            ill hopefully post a picture of a working tv later tonight
                            tommy
                            Last edited by ogtommy; 12-01-2017, 03:49 PM.

                            Comment

                            • ogtommy
                              i don't know#@$
                              • Nov 2015
                              • 30
                              • CANADA

                              #34
                              Re: insignia ns50d40 dead

                              It works!!!
                              Attached Files

                              Comment

                              • ogtommy
                                i don't know#@$
                                • Nov 2015
                                • 30
                                • CANADA

                                #35
                                Re: insignia ns50d40 dead

                                now to find this board for less than the price of a used tv, and then to repair the 3rd and remaining monitor i blew

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #36
                                  Re: insignia ns50d40 dead

                                  Originally posted by ogtommy
                                  It works!!!
                                  What did you find?
                                  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

                                  • ogtommy
                                    i don't know#@$
                                    • Nov 2015
                                    • 30
                                    • CANADA

                                    #37
                                    Re: insignia ns50d40 dead

                                    so i took my sisters logic board out of her tv since she's working nights and tried it in my tv. the tv turned on and worked like a charm. the original logic board seems to have shorted out when the hdmi cable ground was shorted with 120vac live current. the tell tale was the logic board ic burning up so i figured it was kapoot. plus the powersupply board was turning on backlight and 12v sound when i removed the gnd connection from the logic board. when i connected ground all went off. the only signal that was never there was the 0V on the poweron pin(pin3 i believe). i tested them now after i put them in and there was power on all pins except pin3 which was 0v(shorted to ground to power on my tv). i am so glad to have a working tv. 1 goes out its ok but to loose 3 tvs in 1 second really really sucked. i rewrote the edid on my samsung 27" monitor so that works and replaced the internal board of the other one because it was too much work. lol
                                    thanks for all the help
                                    tommy

                                    Comment

                                    • ivtec
                                      Badcaps Legend
                                      • Dec 2008
                                      • 1967
                                      • USA

                                      #38
                                      Re: insignia ns50d40 dead

                                      Originally posted by ogtommy
                                      so i took my sisters logic board out of her tv since she's working nights and tried it in my tv. the tv turned on and worked like a charm. the original logic board seems to have shorted out when the hdmi cable ground was shorted with 120vac live current. the tell tale was the logic board ic burning up so i figured it was kapoot. plus the powersupply board was turning on backlight and 12v sound when i removed the gnd connection from the logic board. when i connected ground all went off. the only signal that was never there was the 0V on the poweron pin(pin3 i believe). i tested them now after i put them in and there was power on all pins except pin3 which was 0v(shorted to ground to power on my tv). i am so glad to have a working tv. 1 goes out its ok but to loose 3 tvs in 1 second really really sucked. i rewrote the edid on my samsung 27" monitor so that works and replaced the internal board of the other one because it was too much work. lol
                                      thanks for all the help
                                      tommy
                                      May not be your case but many people also don't know just by plugging and unplugging the HDMI cable from the TV input with TV on may burn the HDMI output,i've see that.

                                      Comment

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