Basic ideas of LCD screen maintenance in Shenzhen

Basic ideas of LCD screen maintenance in Shenzhen

1. The whole display device is dead

This is a relatively simple fault. Generally, there are two kinds of power supplies inside the LCD extension and outside the equipment. Those outside the equipment are more common.

No matter what kind of power supply, its structure is much simpler than the power supply of CRT display screen. The vulnerable parts are generally some small components, such as fuse tube, input inductor, switch tube, zener diode and so on.

The relatively rare fault is that the power supply does not start due to the CPU of the main board. In fact, the basic principle is very simple, that is, according to the keying board to the CPU, and then according to the CPU output a manipulation data signal, the driver power conversion IC chip is working.

2. The monitor will not light up once it is on, but the power display light is on for a long time.

Such problems are generally caused by abnormal high voltage, which is caused by maintaining the posture of the power circuit. In such cases, there is information displayed on the LCD, and the way of looking is "squint".

The key point of maintenance is to compare the maintenance method.

Because the design scheme of the high-voltage panel of today's LCD is generally symmetrical, and most of the broken ones on both sides will not.

Generally, the problems of the old machine are the step-up transformer and LED lamp. There are many problems in the maintenance power circuit and processing technology of the new mobile phone.

3. Bright line or open line of the display screen

This kind of problem is generally the failure of LCD.

The bright line fault is generally caused by the problem of the line connecting the LCD itself.

The open line is usually the screen itself has power failure. Most of the above two problems are that the death sentence is suspended for the equipment, which has no maintenance value, because the price of a screen is too high.

4. The screen is flashing or black

This poses a problem. If the optocoupler circuit of the screen is on the main board, it should be the fault of the main board. If the optocoupler circuit of the screen is on the LCD screen, the screen should be replaced under normal conditions, and the risk of maintenance is very high.

5. Color deviation fault

Generally, it can enter the maintenance adjustment mode to carry out adjustment.

6. Other relatively rare faults

Impact: under different working modes, the LCD may have some effects. Most of them are under normal conditions, and very few are generated on the power circuit.

Due to the unique production process of LCD, the problems that can only be detected under the standard working mode can be regarded as faults.

Shenzhen Yuhua Micro Technology Co., Ltd. is a company engaged in the development and sales integration of LCD and LCM. It is located in Longhua new area, Shenzhen. It has superior geographical location, beautiful environment and convenient transportation. In addition, the company has gathered backbone talents with rich experience and operation ability in marketing, product R & D, product production, project implementation, customer service and technical training, and has strong management and technical ability.