CompTIA A+ | Microsoft MTA O/S: Training (Display Adapters and Monitors)
Source by Wikipedia
Monitor Connectors:
· If you are using a Monochrome / CGA/ EGA monitor, it is a digital monitor and will have a DB-9 Male connector that plugs into a digital adapter.
· If you are using a VGA/ SVGA monitor, it will have a male DB-15 connector that plugs into ananalog adapter. You should never interchange an analog monitor to that of a digital adapter and vice versa, or severe damage may take place.
Video types
Video monitor |
Max. Color depth |
Max. Resolution |
CGA |
16 Colors |
160X100 |
EGA |
64 colors |
640X350 (Graphics Mode) |
VGA |
256 colors |
640X480 (Graphics Mode) |
SVGA |
16 Million Colors |
1280X1024 or even more |
When you are installing a different SVGA monitor, it is unlikely that the new monitor has the same
capabilities as the old one. As a result, the image on the screen may not be readable. In such instances,
change the video resolution to Standard VGA before installing the new monitor. You can change the
resolution appropriately after the image on the screen is readable with the new monitor. It may also be
necessary to load appropriate device driver, if you are installing a different display adapter.
LCD Monitors:
The ‘native resolution’ specification points out one of the big differences between LCD and CRT
displays. If you run an LCD at any resolution other than its native resolution, the display will become
blurry, especially with text. The reason this happens on LCDs is that they are made up of tiny cells in a
matrix (called the native resolution). For instance, if the native resolution is listed as 1280×1024, then
there are 1280 cells across and 1024 cells down the screen. If you only display at 1024×768, then a
large number of the pixels are being ’stretched’ over multiple cells, which is what causes the image
quality to degrade.
Various resolutions commonly used with LCD monitors are as given below:
1024 x 768 is XGA (eXtended Graphics Array)
1280×720 is WGA/WXGA (Wide eXtended Graphics Array)
1280 x 1024 is SXGA (Super eXtended Graphics Array)
1400×1050 is SXGA+ (Super eXtended Graphics Array Plus)
1680×1050 is WSXGA (Wide Super eXtended Graphics Array Plus)
1600×1200 is UXGA (Ultra eXtended Graphics Array)
1920×1200 is WUXGA (Wide Ultra eXtended Graphics Array)
Wide screen format aspect ratio is typically 16:10 for computer monitors and 16:9 for LCD
televisions. Aspect ratio of 16:10 conforms with WUXGA standard. Further note that UXGA has a
resolution of 1600X1200 and an aspect ratio of 4:3.
Products or instrumentation equipped with a touch screen normally require a calibration routine upon
power up because it is difficult to perfectly align a touch screens coordinates with those of the display
underneath it. Calibration is necessary when the coordinates of the area touched on the screen are not
sufficiently close to the coordinates on the display. Without proper calibration, software may not
respond correctly when a soft button or icon is pressed.It is recommended that you clean the LCD
screen with clean water, using a soft cotton cloth. Do not spray water directly on the screen. First wet
the cloth (no dripping of water), and wipe the LCD screen gently.
Monitors and static charge:
1. Monitors accumulate very high static charges and need to be handled very carefully. Before
attempting any repair, it is important to discharge any accumulated charges on the monitor. You can
use a jumper, one end of which is grounded, and touch the other end of the jumper wire to the anode of
the monitor. While doing so, ensure that you are not in direct contact with the jumper wire or the
anode. You can use a screwdriver, or a nose pliers with rubber handle for this purpose. A “POP” sound
can be heard when the static charges accumulated on the anode lead getting grounded through the
jumper wire. Static charges accumulated on monitors may lead to severe burn or even fatal, if come
into direct contact.
2. Never wear a wrist strap when working on monitors. Monitors contain very high voltages,
sometimes fatal to human, even when the power is turned off. If you are wearing wrist strap, the
human body works as a conduit to discharge the electric charge.
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