Citizen C27604HD not receiving IR codes

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  • neilc6
    Badcaps Legend
    • Nov 2015
    • 1550
    • Canada
    #1

    Citizen C27604HD not receiving IR codes

    This TV appears to use the same hardware as Viewsonic N2751W which I have found a service manual. Initially, the TV had bad caps and a bad Q7 and ZD4 which I have replaced and got the power back up. The remote can be used to power the TV on but at that point, all signals are ignored. There is 5V and pulses are detected at the IR receiver output with my meter.

    There is a remote keycode (power, up and enter at the same time) to bring up the service menu but this isn't working with the TV on or off. I would like to try a factory reset but can't get into the menu.

    The application circuit for the IR receiver datasheet shows a RC filter for VCC but this circuit is on the main board and not the IR board which is connnected through 18 inches of cable. Don't have a scope to see if there is noise pick up from the wires after the filter since it would make more sense to have the filter on the IR board. There is also an optional >10K pullup which on this board is only 1K.

    Suggestions??
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    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: Citizen C27604HD not receiving IR codes

      Is that the original remote? Do buttons work?
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • neilc6
          Badcaps Legend
          • Nov 2015
          • 1550
          • Canada
          #3
          Re: Citizen C27604HD not receiving IR codes

          Yes it is the original remote. The only signal that it responds to is power on when it is off. Once on, no remote functions work including power off. If I manually power off, I can turn on again with the remote. Remote buttons are sending signals viewing the remote LED with a camera and the output level drops probing the IR receiver output pin with a meter.
          Last edited by neilc6; 02-28-2017, 10:29 PM.

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales
              #4
              Re: Citizen C27604HD not receiving IR codes

              Have you tried fresh batteries in the remote?
              Willing to help but I'm no expert.

                Comment

                • neilc6
                  Badcaps Legend
                  • Nov 2015
                  • 1550
                  • Canada
                  #5
                  Re: Citizen C27604HD not receiving IR codes

                  Yes, the batteries are fresh and measure 1.5V each.

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk
                      #6
                      Re: Citizen C27604HD not receiving IR codes

                      page 18 of the user manuals mentions factory reset but not sure if you can use the tv buttons to get to the section
                      https://www.manualslib.com/manual/73...page=18#manual

                        Comment

                        • neilc6
                          Badcaps Legend
                          • Nov 2015
                          • 1550
                          • Canada
                          #7
                          Re: Citizen C27604HD not receiving IR codes

                          Thought I tested the service menu button key code before on the top buttons but tried it again with the TV on and it worked. Went to "EEPROM init" and remote is now working. Key code is "power", "up" and "Enter" pushed at the same time with the TV on.
                          Last edited by neilc6; 03-01-2017, 01:41 PM.

                            Comment

                            • dick_barton
                              Badcaps Legend
                              • Aug 2015
                              • 6642
                              • Wales
                              #8
                              Re: Citizen C27604HD not receiving IR codes

                              So all working now?
                              Willing to help but I'm no expert.

                                Comment

                                • neilc6
                                  Badcaps Legend
                                  • Nov 2015
                                  • 1550
                                  • Canada
                                  #9
                                  Re: Citizen C27604HD not receiving IR codes

                                  Yes it is all working. I probably tried the keycode with the remote and not the front panel buttons before. TV should be on and set to TV input. The TV has some peculiarities - analog tuner only, menu only displays on tv input, input needs to be selected vs cycling through each one.

                                    Comment

                                    • dick_barton
                                      Badcaps Legend
                                      • Aug 2015
                                      • 6642
                                      • Wales
                                      #10
                                      Re: Citizen C27604HD not receiving IR codes

                                      Thanks for the update which could prove very useful to anyone else with a similar problem.
                                      Willing to help but I'm no expert.

                                        Comment

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