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NEC colourful diplay issue

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    #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.
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    #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

      #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

        #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

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          #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

            #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

              #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

                #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

                  #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.

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