7. Computer Monitor Troubleshooting

 Computer Repair Lessons: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 

It is very unlikely that your computer monitor is faulty. From our experiences, only about 1 out of every 20 cases is related to a faulty computer monitor. But, let’s say that the monitor has an issue and displays a one color picture. This problem is most likely because of a faulty VGA cable, or the fact that a cable is improperly connected. The VGA cable has many connectors and if it is not plugged in properly, one or several of the pins could bend.


A dim screen is almost always related to the inverter located in the LCD panels. At times, a dim screen indicates that the CCFL bulbs are failing. The one symptom that indicates there is a bulb problem is when the displaying image on the screen is a reddish hued color. The screen will also light up and then go dim after a few seconds, which indicates a failing CCFL. The main reason why CCFL bulbs fail is because they are aging faster compared to the other computer components. The indication of an aging CCFL is a reddish picture right after a power on. The picture may or may not return to the normal color.

CCFL stands for COL Cathode Fluorescent Lamp.

Today, all monitors have an LED backlight. The only difference between a LED and a LCD is that a LED has an LED backlight and older LCD's have a CCFL backlight. And, LED screens do not have an inverter.


The screen may also show a strange, puzzle looking pattern. This pattern indicates only that there is a problem with the graphics card. In most cases, the graphics will be related to the NVIDIA graphics chip or the ATI graphics chip.

Sometimes, your PC will not start because of problem with the graphics card. This is easily identified using the Systematic Fault Isolation, as described here.

The reality is that a monitor failing is very rare. More often, laptops will be damaged or have faulty screens. The LCD not working because of manufacturing defects is very rare.

Computer users can be confused when monitors display cut images towards the edges or show distorted images. This occurs because the resolution set in the computer is not the one that the monitor supports. The best remedy is to set the display setting to the maximum display supported resolution. The monitors display resolution can be found on the internet using the model number. The resolution stated will be the maximum resolution that the monitor can display without distortion.
Sometimes, a monitor will show a warning message when the resolution is set to a level that the monitor cannot display properly.



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Computer Repair User Guide

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