Dynex 40 inch TV - DX 40L261A12 - Shuts off and won't turn on after a few hours.

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  • OwnedbyCow
    New Member
    • Jul 2018
    • 2
    • United States

    #1

    Dynex 40 inch TV - DX 40L261A12 - Shuts off and won't turn on after a few hours.

    I am going to start off by saying that I am new to fixing actual components rather than what I am used to and just trying to replace them. Off topic - Does anyone know a good starting place to start learning how electronics actually work? Working on my tv seems to be a good place to start learning about troubleshooting components, but I still will not completely understand why it works.

    There are two issues with the tv.

    The first one which is the most important. After having the tv on for a few hours it will shut off and when I try to turn it on, it will attempt to start up. The red light will disappear and it will do everything as normal until it tries to actually turn on the screen then it shuts off. After this, none of the touch buttons will work anymore. I have to unplug it for 30-60 minutes and then try again. Usually waiting for an hour before plugging it in will let me use the tv for another few hours.

    Where should I start with trying to find the actual issue for this? I feel like this would be a power supply issue, but I haven't taken it apart yet. Once I get a bit of feedback, I will take it apart and visually inspect it to see if anything looks burnt out. Then I will try using a voltage meter, but I am not 100% sure where to use it at.


    The second issue is more of an annoyance.

    This problem has been going on for a lot longer than the first issue that I mentioned. The tv will randomly change volume, channels, open the menu or turn off. These are all touch buttons that are on the front of the TV. It is more uncommon than common. Maybe, once or twice during an 8 hour span on average. Sometimes more, sometimes none.

    Could there be dust or anything inside of the tv that would cause it to think there was a touch input? I have cleaned the touch area really well and the problem persisted, so I don't think it has anything to do with the exterior "buttons."

    Any advice helps greatly. Thanks for reading.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Dynex 40 inch TV - DX 40L261A12 - Shuts off and won't turn on after a few hours.

    First, we need good CLEAR picutres of the whole backside of the TV showing how the boards are connected together, then good clear straight shots pictures of each board.
    Basic check right now will be visual inspection, check and verify that all the connectors are plugged in properly.
    Then you will have to the Voltage readings of the power supply at various connectors and test points. You should read basic TV troubleshooting guide.
    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

    • RJARRRPCGP
      Badcaps Legend
      • Jul 2004
      • 6304
      • USA

      #3
      Re: Dynex 40 inch TV - DX 40L261A12 - Shuts off and won't turn on after a few hours.

      Originally posted by OwnedbyCow
      The tv will randomly change volume
      That sounds just like what my Moto e4 (with Android Nougat) does, LMHO! (except it doesn't do that when I have Spotify playing)
      ASRock B550 PG Velocita

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