Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • audiogroove
    New Member
    • Dec 2009
    • 4

    #1

    Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

    Maxent MX-27x1 LCD TV when turned on it displays for a half second then screen goes off. Can still see computer output on screen with no backlighting. I took the whole TV apart and visually checked all the capacitors: none look damaged. While it was apart I found if I put pressure on opposing corners (longest dimension) the backlight would stay on until the pressure was released. After taking it completely apart and reassembling it wouldn't do that anymore. Back to only split second of backlighting when turning on or plugging/unplugging computer. When it is lit the lighting is bright and consistent. Any ideas? I should add that I'm very mechanically inclined and have done alot of soldering (have wired recording studios) but I am not an electronics tech.
  • electroguy75
    Member
    • Dec 2008
    • 21

    #2
    Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

    from ur description of flexing board, sounds as if u may have a bad solder joint causing ur problems.chk solder joints and reflow all that look suspect. pay particular attention to transformer joints.cheers

    Comment

    • audiogroove
      New Member
      • Dec 2009
      • 4

      #3
      Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

      Originally posted by electroguy75
      from ur description of flexing board, sounds as if u may have a bad solder joint causing ur problems.chk solder joints and reflow all that look suspect. pay particular attention to transformer joints.cheers
      Power Supply transformers or inverter board transformers?

      Comment

      • electroguy75
        Member
        • Dec 2008
        • 21

        #4
        Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

        sorry, inverter board. cheers

        Comment

        • audiogroove
          New Member
          • Dec 2009
          • 4

          #5
          Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

          Anyone else have any ideas?

          Comment

          • PlainBill
            Badcaps Legend
            • Feb 2009
            • 7034
            • USA

            #6
            Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

            Originally posted by audiogroove
            Anyone else have any ideas?
            The symptoms indicate a problem in the backlight system. Specifically, it appears the backlight protection logic is shutting them down. Electorguy75's idea of a bad solder joint is plausible, but it could also be a wiring problem to a CCFL. The first step is to identify the failure mode.

            In cases like this, I suggest attaching good pictures of the inverter (top and bottom), including one with the CCFL leads plugged in.

            PlainBill
            For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

            Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

            Comment

            • audiogroove
              New Member
              • Dec 2009
              • 4

              #7
              Re: Maxent MX-27x1 LCD TV Screen On For Split Second Then Off

              Originally posted by PlainBill
              The symptoms indicate a problem in the backlight system. Specifically, it appears the backlight protection logic is shutting them down. Electorguy75's idea of a bad solder joint is plausible, but it could also be a wiring problem to a CCFL. The first step is to identify the failure mode.

              In cases like this, I suggest attaching good pictures of the inverter (top and bottom), including one with the CCFL leads plugged in.

              PlainBill
              Thanks Plain Bill, I will post pictures as soon as I have time to disassemble the unit again.

              Comment

              Related Topics

              Collapse

              • Ryan.man
                Macbook 2017 with touchbar (A1706) won't turn on after removing the screen
                by Ryan.man
                Hello everybody! Posting this in hopes somebody has some expertise that leads to a clear path of troubleshooting that saves me a lot of time!

                My macbook has the flex cable problem, the one that prevents the screen turning on. Ive been dealing with this for the last 3 years. Last year it went dead and I managed to fix it following youtube tutorials. But my fix wasnt the best, the problem returned a month later. This week, it went dead again. I again tried to fix it.

                This time the original cable broke too close to the screen, it can't be fixed without tearing the screen...
                02-04-2025, 12:23 PM
              • smic717394
                iphone XS turns off when press on screen.
                by smic717394
                Hi,

                I have a iphone XS that came in for a screen replacement, the screen was badly cracked, and inside missing scues, on the back of the screen still the blue protector, the screen was a LCD. So we replaced the screen and all good, installed the screen and we noticed that pressing the screen with a bit of force but not excessive, the phone dies. After plugging the charger it turns back on, but again if you press it it dies. I open the phone again, and I can't see anything major, with the phone open, if I press on the logic board, battery, charging board, or even putting pressure on...
                07-25-2024, 10:16 AM
              • Chrissygizmo
                Samsung UE55JU6800K half screen dark
                by Chrissygizmo
                Hello everyone, I’ve just been given a Samsung UE55JU6800K smart tv as it had white spots on the screen due to the led lenses falling off. After refitting them & putting the tv back together I thought it was a nice easy fix for a free bedroom tv , then I tried it before screwing the back into place. I realised that the right side of the screen was darker than the other side, I removed the screen again as I thought the backlights had failed but they are fine.
                I put the screen back in place & turned it back on . The screen seemed to be ok again but different screens on the same...
                02-10-2025, 12:33 AM
              • spice_disc
                Vizio TV M50-C1 reboot cycle and static on screen
                by spice_disc
                I'm currently trying to diagnose and fix my Vizio TV (Model M50-C1). I've tried a number of different basic solutions, but I'm trying to determine if my issue is currently a failing panel, T-Con board, or main board (or something else entirely) and whether or not it is worth my time to fix it. Details of the issue and what I've tried are below as well as why I think it is either a bad panel, T-Con board, or main board.

                The Issue: The TV will be on and working fine but after the TV is on for ~5-10 minutes the screen will freeze (with sound continuing) until the TV reboots itself. While...
                09-08-2024, 02:37 PM
              • ipatch
                ipad pro 9.7" blew a SMD component while replacing the screen 🤦‍♂️
                by ipatch
                i have an ipad pro 9.7" (1st gen) A1674 where i replaced the screen, but never attached the screen to the frame/chassis (glued down) due to the ipad being previously dropped so the new screen would never fit in the frame properly. so i need flex/bend the chassis to eventually fix the new screen in properly. so i temporarily just applied blue tape around the edges of the screen to keep it in place. when watching videos with the ipad the screen started flicker, so i though maybe the new quasi cheap amz screen i purchased was going out. so i disconnected then reconnected with power still on,...
                08-24-2024, 02:36 PM
              • Loading...
              • No more items.
              Working...