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Apple LCD 30 Turns off

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    #1

    Apple LCD 30 Turns off

    30-inch Apple Cinema HD Display

    M9179LL/A

    Problem soon as it is powered on
    Switches off striaght again.
    Then have to disconnect and reconnect power and same thing.

    Have isolated power to inverter board.
    Had a donor machine to swap boards with,

    Pictures attached
    Attached Files
    Tags: None
    #2
    Re: Apple LCD 30 Turns off

    Did you check the fuse on the T-CON/LOGIC Controller board?
    http://s807.photobucket.com/user/bud...?sort=3&page=1

    I replaced the fuse with PICO II (GREEN FUSE) as shown here:
    http://s807.photobucket.com/user/bud...tml?sort=3&o=7
    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: Apple LCD 30 Turns off

      Checked the Tcon board, everything is ok on that.
      Problem is on the invertor board, have been swapping out the boards to see which had the problem.
      Its on the inverterboard (shown in the pics).
      Caps look ok,

      Guessing problem is the caps or the mosfets ?

      Comment

        #4
        Re: Apple LCD 30 Turns off

        Did you ever troubleshoot the inverter board ?

        Comment

          #5
          Re: Apple LCD 30 Turns off

          It switches off or it goes black ??
          If the inverter is a problem the power led should flash 2 short flashes and 1 long flash. does it do that ?
          Does the screen light at all for a second or two ?
          this looks like the 2007-2010 model board.. which is not as good as the older model boards because everything works on one zone which means if one part goes, the whole thing stops working. The older ones were in 2 and 4 zones which was a much nicer setup.
          Check to make sure that the small wire at the small plug of the inverter is ok
          If you have a voltage tester, see if you have 3volts on VBR and 5 volts on pwr/on
          check the fuse for 24 volts on both sides
          if these are ok, you may have a bad transformer.. with an ohmmeter check the two pins on the bulb plug side for resistance. compare each to the other transformers to see if one is reading lower than the rest.

          Comment

            #6
            Re: Apple LCD 30 Turns off

            I had a donor machine
            i swapped out the inverter board.

            Will be having a look at the faulty board later this week I think
            will update when I get a chance

            Comment

              #7
              Re: Apple LCD 30 Turns off

              Looks like you replaced the 4 caps with ZLH caps. So, we know the caps are not the problem. Possibly a shorted mosfet or bad winding on one of the transformers.

              Comment

                #8
                Re: Apple LCD 30 Turns off

                Try placing finger on power button and see if display got turned on. If yes, it is power button issue.

                Comment

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