Repairing an LCD monitor should be an easy task for well trained
experts. However, if you have the natural skills for troubleshooting
most types of electrical equipment, then you may have the capability of
successfully putting back together a defective LCD monitor even if you
lack the formal training.
A liquid crystal display (LCD) monitor which is thin and flat is used in most desktop computers today replacing the cathode ray tube (CRT). It is more energy efficient because it requires less lighting conditions compared to CRT's. Other benefits of the LCD monitor in comparison to CRT's include reduced radiation, causes less eye strain, is light weight and can save space. The life of an LCD monitor is believed to last between 5 to 7 years, and considering the normal wear and tear of the unit, the part that may need replacement during its usable life is usually the backlight.
To repair a faulty LCD monitor, you will need to understand the symptoms first before making any attempts at opening the unit. Always have the manual with you and go over each part and functions carefully. Most users' manual today has a troubleshooting section usually on the last pages for your ready reference. Problems that can be resolved without the need of opening the LCD monitor may include what they term as a dead or stuck pixel. This may appear as a small black spot on the screen or the spot may be green, blue or red. To correct this, you need to turn off the power of the monitor then gently put pressure to the dead pixel by tapping on the spot using a pencil eraser or any solid material that will not scratch the screen. The tapping needs to be done several times until the spot disappears. If the picture is dull or dim, make adjustments with the display settings for brightness, contrast, color, etc...Again you refer to the users' manual for the standard settings.
Symptoms such as a blank LCD screen, or a screen that shows only one part that is bright and the other dark, or if you see the red or pink color dominating the screen, rippling patterns, tearing lines, etc... are indications that the problem is internal so you will need to open the monitor. Separating the front shell of the monitor from its back shell needs to be done carefully to avoid any damage to the LCD screen. After pulling off the monitor from its monitor stand, lay down the main part face down on a flat smooth surface. Remember that you will be dealing with quite a number of screws here, so be careful to set them aside accordingly. You may opt to put a marker or label them on a piece of paper to easily distinguish to which part it belongs. It is important to be precise here especially when doing an exploratory operation to determine where the problem really lies.
Always be ready with your soldering tools, small screw drivers, cutter, high-temperature adhesives and voltage tester. Once you have successfully opened the monitor shell, focus on possible burnt parts, bulging capacitors, liquid discharge, cracked board, and the like. These symptoms will require parts replacement. Outside of your voltage tester, having an equivalent series resistance (ESR) meter will come in handy because it is capable of detecting defective capacitors faster. Damaged electrolytic capacitors are often the culprits to LCD monitor breakdowns. However, if the parts just mentioned do not exhibit any sign or signs of damage, the next thing to check is the backlight. Once you have replaced the damaged part or parts, just put everything back together very gently and you can pat yourself on the shoulder for a job well done.
A liquid crystal display (LCD) monitor which is thin and flat is used in most desktop computers today replacing the cathode ray tube (CRT). It is more energy efficient because it requires less lighting conditions compared to CRT's. Other benefits of the LCD monitor in comparison to CRT's include reduced radiation, causes less eye strain, is light weight and can save space. The life of an LCD monitor is believed to last between 5 to 7 years, and considering the normal wear and tear of the unit, the part that may need replacement during its usable life is usually the backlight.
To repair a faulty LCD monitor, you will need to understand the symptoms first before making any attempts at opening the unit. Always have the manual with you and go over each part and functions carefully. Most users' manual today has a troubleshooting section usually on the last pages for your ready reference. Problems that can be resolved without the need of opening the LCD monitor may include what they term as a dead or stuck pixel. This may appear as a small black spot on the screen or the spot may be green, blue or red. To correct this, you need to turn off the power of the monitor then gently put pressure to the dead pixel by tapping on the spot using a pencil eraser or any solid material that will not scratch the screen. The tapping needs to be done several times until the spot disappears. If the picture is dull or dim, make adjustments with the display settings for brightness, contrast, color, etc...Again you refer to the users' manual for the standard settings.
Symptoms such as a blank LCD screen, or a screen that shows only one part that is bright and the other dark, or if you see the red or pink color dominating the screen, rippling patterns, tearing lines, etc... are indications that the problem is internal so you will need to open the monitor. Separating the front shell of the monitor from its back shell needs to be done carefully to avoid any damage to the LCD screen. After pulling off the monitor from its monitor stand, lay down the main part face down on a flat smooth surface. Remember that you will be dealing with quite a number of screws here, so be careful to set them aside accordingly. You may opt to put a marker or label them on a piece of paper to easily distinguish to which part it belongs. It is important to be precise here especially when doing an exploratory operation to determine where the problem really lies.
Always be ready with your soldering tools, small screw drivers, cutter, high-temperature adhesives and voltage tester. Once you have successfully opened the monitor shell, focus on possible burnt parts, bulging capacitors, liquid discharge, cracked board, and the like. These symptoms will require parts replacement. Outside of your voltage tester, having an equivalent series resistance (ESR) meter will come in handy because it is capable of detecting defective capacitors faster. Damaged electrolytic capacitors are often the culprits to LCD monitor breakdowns. However, if the parts just mentioned do not exhibit any sign or signs of damage, the next thing to check is the backlight. Once you have replaced the damaged part or parts, just put everything back together very gently and you can pat yourself on the shoulder for a job well done.
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