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Insignia - NS-42E570A11 intermittent backlight flashing

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    #1

    Insignia - NS-42E570A11 intermittent backlight flashing

    Hello again!

    I have an Insignia TV, model: NS-42E570A11, that has a great working picture and inputs on it, however, after being on and displaying a picture for a few minutes, then the backlight will intermittently start to blink on and off. There is no set rate at which it flashes on and off. The picture (LCD) display still looks great, it is just the backlight that is blinking off and on (not the picture signal going in and out).

    I haven't had a chance/time to open it up and measure any voltages yet, but wanted to post what I had in case anyone already might recognize the problem. Thanks in advance!
    Tags: None
    #2
    Re: Insignia - NS-42E570A11 intermittent backlight flashing

    Try turning the backlights level to as low as possible to see if the symptom will go away, it sounds like the LED backlights are going bad.
    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: Insignia - NS-42E570A11 intermittent backlight flashing

      Originally posted by budm View Post
      try turning the backlights level to as low as possible to see if the symptom will go away, it sounds like the led backlights are going bad.
      +110

      Comment

        #4
        Re: Insignia - NS-42E570A11 intermittent backlight flashing

        Ok, so I had some time finally to mess around with the tv. I set it up, turned it on and gave it a good input (HDMI). TV worked just fine and with a great picture. After a few minutes of warming up, it started flashing again for about a minute or two. long enough for me to play with the brightness and backlight brightmess settings. Interestingly, as I changed the backlighlight brightness all the way down, it didnt make a difference. When I turned them all the way up, it stopped the blinking.

        So next day I tried it again. (And 2 more consecutive days after) I turned the tv on, good input and let it warm up some. I even let the tv sit on for many hours. This time and since I have not gotten it to duplicate the problem again. I even changed the brightness and backlight brightness settings up and down. Nothing, no blinking. Seems to be working good now. Hoping the gremlins were chased out with the bright lights. But I am expecting the problem to show back up at a random (probably most inopportune time, like watching a football game lol). I will periodically keep checking the tv and changing the brightness levels to see it I can get the problem to show up again.

        Oh well, guess it is a good thing lol. Thanks for all the help!

        Comment

          #5
          Re: Insignia - NS-42E570A11 intermittent backlight flashing

          It's a backlight problem alright. Probably adjusting the backlight level which would be altering the PWM signal did the trick. Monitor it as it may show up again and this time you know you'd have to replace the backlight LEDs. Good luck.

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