Question about Panasonic Toughbook CF-51 Notebook

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The screen flickers when opening laptop.

The screen "flickers" when I open my laptop. Is a cable intermittent?

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It's one of two things, either it's the backlight inverter or it's the switch which tells the laptop the lid is closed.

The backlight inverter is what powers the lamps in the back of the screen.They aren't expensive, but a computer shop will probably charge you an arm and a leg to replace.

The switch tells it to turn the backlight off when the lids is down to save power.

If it's the switch, you can disconnect it by following this guide http://forum.notebookreview.com/showthre… and http://forum.notebookreview.com/showthre… according to that if it thinks the lid it will turn the blue touchpad LED orange to indicate the touchpad is locked.

Posted on Jun 02, 2010

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Flickering screen is often caused by a defective cable. Check all the cables attached to your monitor.
If you think all your cables are in good condition, the problem is probably with the environment. Monitors are sensitive to magnetic fields. Change the position where you have your laptop.
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The video inverter may be failing, BUT...

More than likely the backlight is failing. If you can still see a VERY faint image on the screen this is almost certainly the problem.This is a very difficult fix. I recommend a replacement LCD.

It MIGHT be a bad lcd cable. With the laptop on, slowly open it from closed to open and back again and see if there is a position where the laptop screen does not flicker or turn off, [or if it does turn off if it turns back on.

If the screen goes COMPLETELY black then your GPU is failing.

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@crisanne_21

Most of the time, that cause of that flickering screen is a defective LCD flex cable or sometimes called LVDS cable (this is the cable that attaches the LCD panel to the motherboard - it can be caused by a loose connection or simply, it just may have worn out due to opening/closing the lid). The only way to fix that is to replace disassemble the computer and check if there's a loose connection on that LCD cable. If disconnecting / reconnecting the LCD cable doesn't fix the issue, you might need to replace it Disassmebly guides can be found here.


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Screen Flickers when I open the screen.


Adjust the refresh rate of the display.

Click Start, click Control Panel, click Appearance and Themes, and then click Display Alternatively, right-click the desktop, and then click Properties.
Click the Settings tab, and then click Advanced.
Click the Monitor tab, and then click the screen refresh rate that you want to use.
Let me know if i understood it. Also, please do not hesitate to let me know if you need any further assistance.

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Sounds like video card or video cable is faulty or loose. Is screen always blank no matter what you try? Were you getting intermittent screen flickering. There is a ribbon cable that runs from base to lid that sometimes get worn or loose from constant open/close of the lid. Try cranking lid to different positions while trying to boot up. You maybe able to find a video card under one of the covers on bottom. push card all the way inward to make sure it is seated correctly.

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Try the following:

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My opinion is that your LCD could need rewiring or replacing.

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