Have vista home, LCD screen. Often get lines and boxes on screen. Sometimes multicolored, sometimes b&w. These occasionally lock up computer for a while. Sometimes they disappear by themselves, other times I have to change the program to wipe them. Really annnoying.
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Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
Sound like you lost one of your colors (red, green, or blue). You can try an autosync function on the monitor, if there is one, or autocolor adjust, or something similar. But it sounds like the monitor LCD panel might be defective beyond repair. Youn can check your color levels. SOmetimes one will drop to zero for no reason. Try running your finger (pushing lightly on the LCD) around the edge of the monitor screen. Sometimes a transistor just gets stuck and you can close it back up. Keep track of where your finger is when the picture is correct, and home in on the exact spot. Then, just massage that area with your finger until the display looks right. That doesn't always work, but it's worth a try.
Usually lines, multicolored artifact etc. is indicative of a failing lcd panel or...a loose cable connector. There is no repair for this type of problem other than screen lcd panel replacement or secure the loose connection.
The thin ribbon that connects the board on the back of the lcd screen to the front glass of the lcd screen got damaged.
It wraps around the top of the screen and is very thin and can be easily damaged.
May be from old age and heat at the top of the screen or it could have gotten hit at the top.
The cheapest way to repair this is to replace the lcd screen with a
good used one because trying to find a shop to try to repair it would
cost more than a new monitor. It will change color with different colors and also if you push the screen at the top point. Don't play with pushing the screen too often as this may cause more to show up.
Sorry there isn't an easy fix to this.
same problem, broke my screen, ordered a new screen off ebay and replaced it. now it works fine most of the time but sometimes external display freezes. sometimes goes black, sometimes goes multicolor pixelated (full screen, in blocks, or lines) when this happens sometimes touchpad still works, others not. removing battery usualy temporarily fixes.
This is caused by the driver tabs between the LCD panel and the controller board that runs it inside.
In general, it is not a repairable thing, and can be very expensive to repair if you choose to go that route.
Please note this is not the video card that is inside the monitor,(where your cable from the PC connects to the monitor) but the actual driver board for the panel.