How to fix the broken LCD screen? Yuhua micro tech

How to fix the broken LCD screen?

1. Turn off the power and take out the battery. First remove the screw in front of the computer screen, and then open it to take down the broken screen.

2. Pay attention to the slot on the back of the screen and be careful when pulling it out. Tear off the adhesive tape first and then pull it. Be careful not to pull it off where there is a thread end. Check the back of the screen, which will indicate the model. For example, led140 / 170 represents 14 / 17 inch screen.

3. Prepare a new screen and install the two "bumpers" removed from the old place. These two are used to screw.

4. Connect the cable of the new screen to the slot, which is the previous connection. When inserting, be sure to insert to the bottom and fit tightly, so it will not be easy to call out and the display effect is better. After completing this step, turn on the power and check whether it can be displayed normally. Screw the cover directly, if it's normal.

Judgment of common problems in LCD screen maintenance

1. The whole monitor has no electrical fault: the fault analysis is relatively simple. For LCD screens, there are usually two kinds of power supplies, internal and external. Some common problems of external power supply. However, no matter what type of power supply, its structure is much simpler than that of CRT display. Generally, small components are easy to be damaged, such as fuse tube, input inductance, zener diode or switch tube, etc.

2. Relatively rare is the failure caused by the mainboard CPU in the maintenance of LCD screen, such as the power supply can not be started. In principle, this part is also relatively simple in principle. Generally, it will be connected to the CPU through the keying board, and then the CPU will output the control signal to drive the power supply to transform the integrated circuit to work.

3. During the maintenance of LCD screen, it is often seen that the display screen turns black when it is on, but the relevant power indicator is always on. Such a situation is the action of the protection circuit caused by abnormal high voltage. In this case, there will be a display on the LCD screen, which can be seen through squint. There are also important points in maintenance, that is, the comparative repair method. At present, our common LCD screen high-voltage panel design is symmetrical design, and it is impossible to have bad conditions on both sides. In addition, the old machine is easy to have problems with the step-up transformer or lamp, while the new machine has many problems in the protection circuit and technology.

4. The problem of bright or even dark lines on the screen is generally the problem of LCD. The failure of the bright line is caused by the problem of wiring connecting the LCD body. The dark line is caused by the leakage of the screen body. It can be said that the above two situations are basically of little maintenance value. The price of replacing a screen can be about the same as buying a new one.

5. The LCD screen has a flower screen or white screen, which is caused by the problem of the screen driving voltage. But if the screen drive circuit is on the motherboard, that's the reason for the motherboard. If the driving circuit is on the LCD screen, the screen shall be changed due to the high maintenance risk.

6. The screen has the fault of color deviation, which can be adjusted through the maintenance and adjustment mode.