The functional defects that are prone to occur in high brightness LCD screens and high brightness LCD screen modules and their causes are analyzed as follows:
1、 The analysis of the causes of poor functionality of LCD modules is as follows:
1. Possible reasons for not following the program include: problems with the testing fixture, power supply, and testing clip; The PCB board is damaged.
2. Possible reasons for display disorder include: faulty testing fixtures; The PCB board chip is damaged; The pressing plate and screen are severely misaligned, and the zebra paper is short circuited with the board; Zebra paper short circuited.
3. The possible reasons for a shallow screen include: PCB board short circuit; Short circuit caused by dirty PCB board; The zebra paper itself is short circuited, and the zebra paper electrode at the pressure screen is short circuited; When pressing the pressure plate or screen, the electrodes are misaligned.
4. The possible reasons for displaying no are: the testing fixture is damaged; Abnormal power supply voltage; The fixture clamp was not properly clamped during testing; PCB board is damaged; The zebra paper has severe cracking at the press joint.
5. Possible reasons for missing COM or SEG include: PCB board open circuit; When pressing the pressure plate or screen, the electrode of the zebra paper is cut off, and the electrode of the zebra paper itself is broken; When clearing the screen, cut off the electrode or the electrode of the screen itself is broken; The zebra paper cracked at the press joint
2、 The main faults of the LCD module
1. During the testing process, a certain screen is light
2. In addition, the electrical display is chaotic
3. Lack of COM (horizontal bar) or SEG (vertical bar)
4. Display None
5. Do not follow the program.
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