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Pelco 42 inch Monitor Shuts off .5 secs

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    Pelco 42 inch Monitor Shuts off .5 secs

    Hey guys hoping you can tell me where to start with this thing. I got a seemingly brand new pelco monitor 42 inch model PMCL542F.

    I visually checked the boards and all caps etc look fine no burnt spots or bulging that I can tell I've yet to do anything further because honestly I'm not sure where to start.

    The monitor/tv turns on for half a second shows logo and then turns off. It also makes what I could only describe as crickets/clicking noise when plugging it in after being unplugged for awhile.

    Also not sure if that is a inverted board on the far left or not.

    I am just hoping someone can tell me where to start. I.e. inverter, PSU, mainboard etc.

    I am attaching a video and some pictures below.

    https://www.youtube.com/watch?v=RIlixvsiKB4

    you can hear the crickets when I plug it in in the video.

    http://imgur.com/a/WC9lx

    there is a link to the hi res images


    Thanks guys hope you can help

    Got this from a local recycler hoping to bring it to life and make it my computer monitor.

    Cheers guys appreciate your time!

    #2
    Re: Pelco 42 inch Monitor Shuts off .5 secs

    Remove the two connectors for the Inverter board (the long board under the metal shield) and see if the clicking goes away.
    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


      #3
      Re: Pelco 42 inch Monitor Shuts off .5 secs

      Unplugged and still same noise. Upon further inspection its definitely coming out of the main PSU. I can't be sure but putting me ear as close as I can without fear of getting bitten, it seems like its coming from those blue blocks. I guess they are "AC film capacitors"?

      Circled them here: http://s30.postimg.org/k45z8zd69/dnj7_Sz_Y.jpg
      Also circled the entire area where I know the noise is coming from.

      here is pics of the two of those blue capacitors: http://imgur.com/a/xghHz


      So am I wrong to assume that they stopped using CCFL backlights in these newer model displays? If that is indeed an inverted board.

      Comment


        #4
        Re: Pelco 42 inch Monitor Shuts off .5 secs

        Those are X/Y safety caps Line noise filters.
        Did you do any DCV checking to see if the DCV on the cold side connectors have steady DCs?
        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


          #5
          Re: Pelco 42 inch Monitor Shuts off .5 secs

          I did not and I only slightly understand what your talking about. But I do know how to read fairly well......

          Comment


            #6
            Re: Pelco 42 inch Monitor Shuts off .5 secs

            You mean check the dc line out on the psu with a meter? By cold side do you mean the DC side of the PSU?

            Comment


              #7
              Re: Pelco 42 inch Monitor Shuts off .5 secs

              Originally posted by budm View Post
              Those are X/Y safety caps Line noise filters.
              Did you do any DCV checking to see if the DCV on the cold side connectors have steady DCs?
              So those basically clean the AC current before it gets converted by the transformers?

              Comment


                #8
                Re: Pelco 42 inch Monitor Shuts off .5 secs

                There are three white connectors on the cold side of the power supply board, those wires for the connectors go the inverter board, the main board.
                The pins of the connectors are also labeled to tell you what they are.
                Attached Files
                Last edited by budm; 03-08-2016, 05:12 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


                  #9
                  Re: Pelco 42 inch Monitor Shuts off .5 secs

                  Originally posted by budm View Post
                  There are three white connectors on the cold side of the power supply board, those wires for the connectors go the inverter board, the main board.
                  The pins of the connectors are also labeled to tell you what they are.
                  Ok gonna check voltage on them now

                  Comment


                    #10
                    Re: Pelco 42 inch Monitor Shuts off .5 secs

                    Showing 13.98v on the 12v pins, 4.98v on 5v standby. The inverter board doesn't show anything but this is with it powered off. Not sure if I should turn it on and try.

                    Comment


                      #11
                      Re: Pelco 42 inch Monitor Shuts off .5 secs

                      The switched 24V for running the inverter board will not be present until the power switch is activated and the monitor is fed with signal otherwise the monitor will go into standby by due to lack of video signal from PC.
                      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


                        #12
                        Re: Pelco 42 inch Monitor Shuts off .5 secs

                        So where should I go from here. Its a 2500$ monitor. think I should swap the inverter.

                        What I mean by that is itd be worth it to swap some boards if i need to.
                        Last edited by neverexisted; 03-08-2016, 06:05 PM.

                        Comment


                          #13
                          Re: Pelco 42 inch Monitor Shuts off .5 secs

                          So you have the cable between the power supply and the inverter board connected back in place but and there is no 24V from the power supply board to feed the inverter board?
                          And without the Inverter cable connected you also do not have 24V at the power supply connector? If that is the case then you have power supply board problem. Inverter needs that 24VDC from the power supply.
                          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


                            #14
                            Re: Pelco 42 inch Monitor Shuts off .5 secs

                            Should I test that with it powered off

                            Comment


                              #15
                              Re: Pelco 42 inch Monitor Shuts off .5 secs

                              So leave it in standby and test for 24v on that pin?

                              Comment


                                #16
                                Re: Pelco 42 inch Monitor Shuts off .5 secs

                                ok tested in standby and 28 volts on all pins leading to inverted board.

                                Comment


                                  #17
                                  Re: Pelco 42 inch Monitor Shuts off .5 secs

                                  So all the Voltages so far are steady then?
                                  You have indicated that it shutdown in half second do the power LED goes off or you see the image on the screen for half second and then the backlights shuts off but the power LED is still on, is that right. Or it is like as if someone turn off the power switch.
                                  I am trying to understand the shut off part.
                                  Last edited by budm; 03-09-2016, 12:24 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


                                    #18
                                    Re: Pelco 42 inch Monitor Shuts off .5 secs

                                    Voltage is all steady far as I can tell.

                                    Turns on half a second shows a clear image. Standby light goes from red to green. Green light stays on after it shuts off as if it were still powered on. No image when shinning a flashlight so I Dont think that it is a bad backlight.

                                    Comment


                                      #19
                                      Re: Pelco 42 inch Monitor Shuts off .5 secs

                                      Originally posted by neverexisted View Post
                                      Voltage is all steady far as I can tell.

                                      Turns on half a second shows a clear image. Standby light goes from red to green. Green light stays on after it shuts off as if it were still powered on. No image when shinning a flashlight so I Dont think that it is a bad backlight.
                                      The monitor did not shutoff it is still power on with all the DCV present, only the backlights go out.
                                      So it can be either the Inverter board or lamps problem.
                                      Can you remove the metal shield so we can see what are on the inverter board.
                                      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


                                        #20
                                        Re: Pelco 42 inch Monitor Shuts off .5 secs

                                        Originally posted by budm View Post
                                        The monitor did not shutoff it is still power on with all the DCV present, only the backlights go out.
                                        So it can be either the Inverter board or lamps problem.
                                        Can you remove the metal shield so we can see what are on the inverter board.
                                        Wait so should I power it on then check the voltages again after the monitor shuts off?

                                        Comment

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