The days of the old and bulky cathode ray tube monitors are long gone. With the departure of these devices, they ceased to bring troubles and standard malfunctions of monitors of that time. It would seem that the new flat monitors, which have become ubiquitous, should have been devoid of any problems, since there is practically nothing to break there. However, these devices also turned out to be not as reliable as expected by users, and their failures can also be systematized.
The standard LCD monitor today has a fairly simple design. These are the case, the protective panel on the screen, the matrix, the matrix backlight, the power module, the processor and controllers. There are also input interfaces and a power connector. All monitor malfunctions are reduced to the failure of one of the listed parts. A laptop monitor does not fundamentally differ from a regular desktop monitor.
Each breakdown has its own symptoms. can be reduced to mechanical and electronic.
Mechanical malfunctions of the monitor
They can be eliminated very simply. This is the power cord that has jumped out of the connector or dirt on the pins of the connecting cable. Such defects are treated by alternately disconnecting all wires and connecting them.
In the case of a laptop, this also includes damage to the connecting cable, which is constantly subjected to cyclic loads. The cable can be easily replaced with a new one, and a malfunction will cause interference when the cover with the display moves.
Electronics malfunctions in the monitor and their elimination
If you combine all the standard faults into groups, you get a list of typical faults.
Monitor does not turn on
The monitor does not turn on after pressing the power button. Most often, the problem lies in the failure of the power supply module. In the power supply, the first thing to do is to fail the capacitors. Disassemble your monitor very carefully, after unplugging it from the power supply, and check the condition of the cans. Remember that capacitors store an electrical charge and can shock you. If you do not understand the basics of electrical engineering, contact a professional service.
If the capacitors are swollen, then the problem is obvious. You need to buy similar parts and replace them. All parts are labeled, so an analogue will be easy to find. If there is no obvious damage, then you can simply replace the entire power board with a similar or new one. In addition, you need to carefully inspect the soldering on all parts. Sometimes the problem is obvious. It will be quite problematic to do more complex manipulations on your own.
Image appears dim
The picture is present, but there is no backlight. If you light up the monitor, you can see that there is a picture. In this case, you need to think about a violation in the backlight lamp circuit or the failure of the lamp itself. In addition, the power supply or inverter may also be damaged. All these parts can be replaced by yourself if new suitable options are available.
Horizontal or vertical stripe on the monitor
The monitor is working, but a solid one-color stripe runs through the entire image. The malfunction is often associated with damage to the matrix, which has occurred from the long service life of the monitor or is simply the result of poor quality workmanship. The only thing that can be done is to check the connection of the pin connectors to the matrix and try to carefully glue the loose contacts. But, most likely, a new matrix will be required.
Dark or colored spot on the screen
It occurs most often as a result of a blow to the monitor. Also, frequent and strong poking of fingers at the monitor leads to this refusal. Matrix replacement will be required.
Bright single dots on the monitor
These are dead pixels - a common problem with inexpensive monitors. Appears as a bright dot of a different color on the monitor. The consequence of a manufacturing defect or long work. Also, it may indicate mechanical damage to the matrix. Sometimes it can be eliminated programmatically.
Reduced monitor brightness
It is a consequence of the failure of the backlight lamp.
Image jitter and noise
Technically, this problem will be quite difficult to solve for an unenlightened user. However, sometimes the problem can be solved very simply by simply replacing the cable. Instead of a regular cable, you need to take a cable with an EMI suppressor.
Repair of a modern LCD monitor
Modern monitors are quite reliable and failure of the device is quite rare. However, such cases do occur. If the malfunction is not associated with a cable that has come off or a bus that has fallen out of the connector, then it is associated with a failure of the electronics. Unfortunately, it is electronics that breaks down most often. A serious problem can no longer be solved by simple block repairs and deep knowledge in the field of electrical engineering is required.
When thinking about repairing your monitor, calculate the planned budget. In difficult cases, you will need to purchase an expensive LCD matrix and pay for the labor of a professional master. Most often this is impractical, since a new modern monitor will cost commensurately with the repair of the old one.
