Question about Sceptre X20G-Naga II 20.1" Flat Panel LCD Monitor

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ACER AL 1912 Colors bad screen shakes

My Acer AL 1912 started having bad colors and a shaky screen. The colors seem washed out. It is not the video card, the computer, or the settings. It does it no matter what after about 1 minute. I want to open it and replace parts but what part might it be?

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Posted by ken eder on


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Your asking which part you want to replace. try first to check all the connections.

Posted on Feb 20, 2008


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My screen is shaky and cloudy

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Seems like you're having problem with the display of your computer. There are some reasons why your system displays shaky and cloudy screen. Sometimes it caused by a corrupted video driver or system has a faulty screen (hardware failure). Going to the bios and installing the latest driver are basic diagnostics that you can apply to check if this is a software or hardware problem.

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Ive seen this on other monitors. Look for a 1 and 2. Some monitors do NOT auto detect a signal, and this one might not. Look for a way to set the monitor from Digital input to VGA input. Try that and see.

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My monitor is flashing pretty colors.

Either a bad video card or cable. Wiggle the cable at the connection points. I would think video card. If it's internal, and you are sure it's a bad internal video, a cheap video card can be a quick check. See if a tech friend has a standard PCI video card to borrow. Let someone knowledgeable install it. Must set BIOS to run video from card installed.

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Acer AL 1912 (black) resolution issue

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Screen is shaky

Often such symptoms are caused by interference.

Try separating cables from other cables, keeps speakers, phones etc away from the display, and try plugging power into a different circuit.

If none help, update the video drivers or connect the display to someone else's computer.

If the issue does not exist on another computer and you have done all the things above, the problem is likely a bad video card or power supply.

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Is this on a Linux pc? I had this problem with a Viewsonic and Ubuntu. I had to play with the Horizontal Sync and Vertical Refresh till I got it right.

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There are two types of lines.

Lines caused by a bad LCD screen and lines caused by poor sync.

A bad LCD will cause perfectly straight vertical and horizontal lines that don't move at all. This is because the row and column addressing ICs have gone bad, so you will end up with rows or columns of bad pixels.

Poor sync looks more like what you are describing. The picture will flip vertically and horizontally.

Poor or missing sync can be caused by a bad video cable, or a bad IC on the main board.

If the monitor has a removable video cable, borrow another one from a friend to test if the monitor is working. If it works, head to your local computer store and buy a new cable.
If the monitor still doesn't work with a different cable, you may have a bad main board. The only way to repair the monitor will be to replace the board.

If you open the monitor, be sure to check for bad capacitors. They can cause all sorts of strange faults. Look elsewhere on this site for how-tos on inspecting capacitors.

If your video cable is not removable, there's not much you can do. You will need a way to test that each pin on the cable connector on the main board conducts to a corresponding pin on the other end of the cable. You can do this if you have a multimeter, or a continuity tester.

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