AOC F22+ weird symptoms

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  • Half-Saint
    Badcaps Veteran
    • Jan 2010
    • 213
    • Slovenia
    #1

    AOC F22+ weird symptoms

    Hi!

    I have here an AOC F22+ monitor that powers up but doesn't display a picture for a while. First it starts with displaying a couple of horizontal dotted lines then it springs up to life. From time to time the lines show but it generally works after that.

    I disassembled the screen and the caps look OK. They used Elite ED caps:
    1x 1000uF 25V
    1x 22uF 50V
    2x 680uF 25V
    1x 1000uF 16V
    1x 470uF 16V

    What could be the problem, if not the caps?

    Cheers,
    SainT
    Tags: None
    • selldoor
      Slow Learner
      • Dec 2010
      • 7870
      #2
      Re: AOC F22+ weird symptoms

      Please can you update your profile with country and voltage so we know what we are dealing with. good clear pictures of boards would help. If that 22uf 50v is on the primary
      /hot side it may be the start up cap. Elite are not aptly named.
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

        Comment

        • Half-Saint
          Badcaps Veteran
          • Jan 2010
          • 213
          • Slovenia
          #3
          Re: AOC F22+ weird symptoms

          Thanks for reminding me, fixed my profile :-)

          Here's also a pic of the PCB:
          Attached Files

            Comment

            • selldoor
              Slow Learner
              • Dec 2010
              • 7870
              #4
              Re: AOC F22+ weird symptoms

              Ok think C908 is the start up cap - the small one just behind the BIG one is it the 50v
              22 uf ?? - May not be a power problem at all what you can do is try heating the caps before switching on to see if it makes any difference.
              Does the delay start occur if when its on you switch it off and back on again.

              There is a lead from the main board to the panel lvds Can you remove clean ( if its a flat ribbon type) and reseat. It could also be voltage regulators on the main board
              Can you post a picture of that
              Please upload pictures using attachment function when ask for help on the repair
              http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • Half-Saint
                  Badcaps Veteran
                  • Jan 2010
                  • 213
                  • Slovenia
                  #5
                  Re: AOC F22+ weird symptoms

                  To pre-heat the caps, I'd have to bring a hair dryer from home :-) I'll try switching it off and back on again after it's been on for a while.

                  Flat cable to the LCD can be removed no problem.

                  UPDATE: turned the monitor on and off just fine three times in a row. After the 4th time, it wouldn't display anything anymore just very very thin lines, barely visible. Maybe it's not the power board after all.
                  Last edited by Half-Saint; 07-24-2014, 08:42 AM.

                    Comment

                    • Half-Saint
                      Badcaps Veteran
                      • Jan 2010
                      • 213
                      • Slovenia
                      #6
                      Re: AOC F22+ weird symptoms

                      Here's a pic of the other PCB :-)
                      Attached Files

                        Comment

                        • selldoor
                          Slow Learner
                          • Dec 2010
                          • 7870
                          #7
                          Re: AOC F22+ weird symptoms

                          Pic is a little too blurred I can only suggest you try some new caps on it or at least the one at the top right.
                          If you can get at them when it is powered up you could try and monitor the voltage on it
                          to see if it changes when the picture changes
                          Please upload pictures using attachment function when ask for help on the repair
                          http://www.badcaps.net/forum/showthread.php?t=39740

                            Comment

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