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Vizio D55un-E1 COF Lifting Tabs - Not!

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    Vizio D55un-E1 COF Lifting Tabs - Not!

    Relatively new to TV repair - as you will see. Rescued this TV from the curb. No backlights, but I could see an image on LCD with flashlight, so suspected bad LED strips. When I got to the part of lifting the LCD off the frame, it was stuck a little bit from some tape used to hold down a thin layer of foam around the frame. I saw 8 tabs on each side of the LCD that I haven't seen on any of the 3 TVs that I have taken apart before. I immediately thought, wow the engineers that designed this were thinking about the serviceman when they put these lift tabs on here - good for them. So I started yanking on them to free the LCD screen, and it worked really well, but one of them came off. It was then that I saw it was actually a printed circuit - damn! Hope it wasn't important! After replacing LEDs, put it back together, and the backlights worked, but all kinds of funky stuff going on with the image.

    After researching this forum, I found some instances where people reported success by removing all the "lifting" tabs from one side of the LCD. So, I removed the other 7 tabs from the one side, and was amazed to see that the TV is working great now!

    The moral of this story is don't be a dope like me and think these tabs are lifting aids. But I also have a question, why do they install these COFs on both sides of the screen if they are only really needed on one side?

    #2
    Re: Vizio D55un-E1 COF Lifting Tabs - Not!

    They duplicate each other, in this case the entire load went to one side (the rest on one side).
    They are placed on both sides with a large diagonal in order to distribute the load
    Last edited by lotas; 08-24-2022, 02:41 PM.

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      #3
      Re: Vizio D55un-E1 COF Lifting Tabs - Not!

      Originally posted by lotas View Post
      They duplicate each other, in this case the entire load went to one side (the rest on one side).
      They are placed on both sides with a large diagonal in order to distribute the load
      I don't understand what "duplicate each other" means. They really don't back each other up, because if only 1 out of 16 fails (or detaches), the TV image is nearly useless. But if 8 out of 16 fail (or detach), the TV works perfect. That doesn't make sense to me.

      Anyway, because my TV is now running with 1 side only taking the full load, does this mean the life expectancy has now diminished significantly?

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