Video: Flickering and fixed lines

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  • Tankado
    Member
    • Mar 2015
    • 15
    • Turkey
    #1

    Video: Flickering and fixed lines

    I'm experienced in electronics, but I'm just training myself in monitor repair, and this is the first time I've come across such a failure. This breakdown application is an AOC 917Sw + from our school another school

    The fault is generally intertwined or shaded colors and 5-6 white lines at the bottom edge.

    I've recorded a short video to illustrate this and I share the link below:
    https://youtu.be/va7WohwOauM

    Perhaps repairing is beyond my means (but for now maybe it has a very simple solution.

    In general, I did the following checks:
    • I tested the fluorescence separately intact. No lighting problem. The 5V output of the inverter is clean.
    • I couldn't detect a cold solder on the VGA card. Capacitor capacities are good (I measured and removed).
    • I tested the flex and connector from the VGA card (I'm not sure that's the name to the panel board. The resistance of each line is less than 2.5ohm. I could not detect a short circuit capacitor on the panel board (I must admit that I did these tests on the circuit, I did not disconnect it). I can read 3.3v, 5v and 32v voltages on the panel board.


    I would like to thank the experienced and helpful members of the forum for their advice. Thank you from now.
    Attached Files
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    • momaka
      master hoarder
      • May 2008
      • 12175
      • Bulgaria
      #2
      Re: Video: Flickering and fixed lines

      Check the small capacitors on the video/signal input board. The issue could be due to a regulator dropping in and out either due to bad capacitors or the regulator being faulty. The T-con also should have a linear regulator or two. Check these to make sure the voltage is clean if you have a scope. Or if not, just replace them. Most of time, the linear regulators will be 1117 parts (adjustable and/or fixed voltage) or 1084. In rare cases, you might some something else. They don't fail often, but I've seen it a few times. Always causes weird issues like you see.

        Comment

        • Tankado
          Member
          • Mar 2015
          • 15
          • Turkey
          #3
          Re: Video: Flickering and fixed lines

          Thank you for your advice and help. I will check your issues as best as I can and let them know. Greetings

            Comment

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