NEC colourful diplay issue

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  • diif
    Badcaps Legend
    • Feb 2014
    • 6978
    • England
    #1

    NEC colourful diplay issue

    Hello, I have acquired an NEC EA261WM with an issue i have not encountered before. I have read through the forum and believe the issue to lie with the display board. I have tested the two voltage regulators as shown on a guide on this site and they show the correct voltage (3.305v and 1.803v). I have also tested the 12v from the power supply board and it shows 11.87v.

    I'm no stranger to a soldering iron having replaced bad caps on monitors and motherboards and dc sockets on laptops, and am looking to increase my knowledge, so any help or pointers would be greatly appreciated.
    Attached Files
    Tags: None
    • selldoor
      Slow Learner
      • Dec 2010
      • 7870
      #2
      Re: NEC colourful diplay issue

      Assume you have checked out warranty? Have you removed cleand and replaced the lvds cable? Is there another board Tcon between the board in pic 3 and the panel?

      Is it the same with all imputs?
      Last edited by selldoor; 02-14-2014, 06:51 AM.
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • diif
          Badcaps Legend
          • Feb 2014
          • 6978
          • England
          #3
          Re: NEC colourful diplay issue

          Thanks for your reply, yes the cable has been removed and cleaned.

          I found the t-con board and have the checked the input voltage and get just under 5v after the fuse.

          Yes all of the 12v inputs are the same.

            Comment

            • diif
              Badcaps Legend
              • Feb 2014
              • 6978
              • England
              #4
              Re: NEC colourful diplay issue

              I get 4.94v after the fuse and the voltage regulator is showing 3.336v at the middle leg.
              Attached Files

                Comment

                • selldoor
                  Slow Learner
                  • Dec 2010
                  • 7870
                  #5
                  Re: NEC colourful diplay issue

                  Sorry - I meant vga dvi inputs - is the picture always the same whatever
                  Please upload pictures using attachment function when ask for help on the repair
                  http://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • diif
                      Badcaps Legend
                      • Feb 2014
                      • 6978
                      • England
                      #6
                      Re: NEC colourful diplay issue

                      The image is when i turn the mains on, the power switch is doing nothing, and when i put either a dvi or vga signal in i get no change.

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870
                          #7
                          Re: NEC colourful diplay issue

                          Sounds to me like the main processor on the main board has "lost it" - wait for other comments but start trying to source a new board?
                          Edit
                          Try cleaning the ribbons tcon to panel?
                          Last edited by selldoor; 02-14-2014, 08:29 AM.
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

                            • diif
                              Badcaps Legend
                              • Feb 2014
                              • 6978
                              • England
                              #8
                              Re: NEC colourful diplay issue

                              Thanks selldoor, I'll continue my hunt for one, I wasn't' too successful last night, although i did manage to find a tcon.

                              I've tried cleaning the connectors and cables and I've also gently pressed and wiggled them with no picture change.

                                Comment

                                • diif
                                  Badcaps Legend
                                  • Feb 2014
                                  • 6978
                                  • England
                                  #9
                                  Re: NEC colourful diplay issue

                                  I found a tcon for cheap and ordered on a whim.

                                  No change so it must be the mainboard, thought i would post in case it helps someone in the future.

                                    Comment

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