How to repair cell phone display screen?

As we know, the display screen is easy to broken, if we meet this problem in our daily life, what should we do? How to repair cell phone display screen?

Before we repair the screen, it is significant for us to have a comprehensive understanding about the principle of the mobile phone display screen.

Mobile phone display module is a high integrated product. Parallel port type LCD of the D0 ~~ D7 (D8 to D15), the R / W (/ the RD / WR), C5, and A0 is serial type in the SCL, the SDA replaced, these are used to achieve control drive controller chip on the motherboard CPU such as opening screen, turn off screen, display characters all display operation control and data. VLCD is used to adjust the display contrast of the screen, according to the specific module control voltage; VCC (V DD), GND (VSS) supplies power to the drive control chip. Of course, now, mobile phone display module has a wide range of backlight components and drive components, common light-emitting diodes, flat light-emitting block, are low-voltage drive, but there are also the AC110V driven EL backlight.

Display controller receives display instructions and data through analysis and judgment from LCD. sent over by the, storage, and the scan will be displayed in a certain clock speed dot-matrix information output to the row and column drive to ≥ 75Hz frame rate update screen, when the human eye is in the reflection of outside light, you feel the display screen appears on the display content.

Now, after we have a comprehensive understanding of display screen, next, we will talk something about common faults and how to repair it.

1. Mechanical damage (large area of ​​the black block, cracked, scratched, etc.), such phenomena can not be repaired, only to change the screen.

2. No appearance of injury phenomenon, but there is no display. Class phenomenon should first make sure that the host portion of the normal working of the phone to start (host normally only need to press the power button can dial “112″ can be). First check whether all pins good contact, with a multimeter (multimeter through the conductive properties of the conductive rubber conductive rubber need to check off block the conductive measuring tape at both ends).Above to ensure that the normal can re-boot test, if it does not show, can be checked by measuring voltage and waveform.

3. There, but the lack of pen less program. Parallel port type liquid crystal may be due to the individual data lines D0 ~ D7 (D8 ~ D15) pin connection is bad, but exclude some fault can only say that the LCD module is broken, gently shake the module a few times and try not you can not do anything

4. Display is too dark or too light, the backlight of the original does not shine. Such failures only solve its for VLCD and backlight voltage is not normal can be.

According to this article, we can get the ways to repair the display screen, if you are interested in touch screen technology, please visit our homepage.