Maintenance guide for liquid crystal display tips _ Hardware Maintenance

1. Display machine without power

This is a very simple fault, the general LCD display extension inside the power supply and external power supply two, outside the common some.
Regardless of that power supply, its structure is much simpler than the CRT monitor's power supply, and the vulnerability is generally small components, such as insurance tubes, input inductors, switching tubes, voltage regulators and so on. Relatively rare failure is caused by the motherboard CPU power does not start, this part of the principle is relatively simple, that is, through the key board to the CPU, and then through the CPU output a control signal drive power conversion IC work.

2. The display will not light up, but the power LED illuminated steady

This problem is usually caused by high pressure, is to protect the circuit action, in this case, the general LCD screen is displayed, see the method is "oblique." The main point of overhaul is the contrast repair method. Because, now the design of the high pressure plate of the liquid crystal display is generally symmetrical design, and both sides are bad may basically not. The general old machine is prone to problems is the step-up transformer and lamp, the new machine protection circuit and process problems are more.

3. Screen lights or dark lines.

This problem is generally the LCD screen failure. Light line fault is generally connected to the LCD screen body of the line out of the problem dark lines are generally the main body of the screen leakage, the above two problems basically have no maintenance value, because the price of a screen is too high. But it doesn't affect life.

4. The flower screen or screen.

This problem is generally the screen driving voltage out of the problem, if the screen is the driver circuit in the motherboard, then the motherboard should be the fault, if the screen driver circuit in the LCD screen, the general situation should be changed screen, maintenance of the risk is very large.

5. Partial color fault.

Generally can enter the maintenance adjustment mode to adjust.

6. Other relatively rare fault disturbances.

In different working mode, the liquid crystal display may appear some interference, most of the normal phenomenon, a few are brought on the circuit. Because, the special production technology of the liquid crystal display, caused the problem that can be considered only when the standard working mode is detected.

How to protect the liquid display:

1. Avoid burnout inside the screen

Remember, CRT monitors can burn out for long periods of time, as well as for LCDs. So be sure to remember that if you do not use the time, be sure to turn off the display, or reduce the display brightness of the display, or long time, will lead to internal burn or aging. This damage, once it happens, is permanent and cannot be undone. So be sure to arouse enough attention. In addition, if a fixed content is displayed continuously over a long period of time, it may cause some LCD pixels to overheat, causing internal burn. To avoid such internal burnout, the following measures may be taken when not in use:
A: When it's okay, please turn off the monitor.
B: Always change the display on the screen at different time intervals (such as running screen saver);
C: Reduce the brightness of the display to a darker level;
D: Displays a completely white screen content.

2. Keep the humidity of the environment

All users who have ever caused a keyboard damage by spilling a drink onto a keyboard are aware of this common sense. Don't let anything with a damp nature enter the LCD. The mist was found to be lightly wiped with a soft cloth before the power was turned on. If the wet part is already in the LCD, the LCD must be placed in a warmer, drier place so that the water and organic matter can evaporate. With the humidity of the LCD power, can cause the liquid crystal electrode corrosion, resulting in permanent damage.