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Is this LCD panel shot?

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    Is this LCD panel shot?

    I'm the bench tech at a casino. Working on a Tovis LTG-1750UR used in an IGT Game King upright machine. The screen had no backlight when it came in. So I carefully disassembled the LCD panel, took our the burned out CCFL's, and put in LED strips as I've done dozens of times on several other monitors. The ends of the CCFL's were burned black on the end and even severed in a couple places. Happens all the time in these old LCD's that run 24/7 for 5 years+
    When I put it back together and powered it up, about the bottom 1/3 of the screen is black with a ghost image below the "unsupported" or "No Signal" message on the screen. I was very careful taking it apart and didn't crack or damage the LCD panel. However it was stuck down really tight to the frame so I had to carefully work a thin guitar pick all the way around the edge to get it loose so I could get to the back lights underneath, and it did take a little pressure to get it separated. I took it back apart once and reseated the LVDS cable on both ends and double checked for any cracks or damage. So before I throw it away, I'm looking for a 2nd opinion on if anything else besides the LCD panel itself could cause this, and if there's any way to fix it.
    Thanks

    #2
    I have experienced this exact look and mine was damaged to screen. Ask for more opinion but it looks like damage screen to me.

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      #3
      Yeah I figured as much, just wanted to make sure I'm not overlooking something before I junk it. Thanks much for the reply.
      For some reason, I have not had much luck with this particular model and about 2 out of 3 end up like this but I've had close to 100% good results with just about all the other monitors I've done around the casino floor. The glass screen panel is really stuck down hard to the frame so I have to carefully work a thin plastic guitar pick under the edge to get it loose. It didn't crack but it took quite a bit of force and a little flexing so I guess I could have internally severed a connection without actually breaking any glass. I didn't think it would be very good for the TFT to use a heat gun either. If anyone has a suggestion for a better way to get these apart, I'll try it next time. Most of them have a gasket like material so they usually stick a little but this type is stuck on a lot harder with what appears to be a rubber cement like adhesive and takes a lot more force to break loose. I just hate it when I take my time, try to be careful, waste almost a whole day just to have something not turn out. But it was already junk with no working backlights so I had nothing to lose.
      Last edited by Keshenatech1; 12-15-2023, 11:13 AM.

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        #4
        Maybe try heating the adhesive? Might be bad suggestion. Or to get under the screen better I saw a suggestion to use feeler gauges the bent ones as they are sturdy and thin.

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