Analysis Of Common White Screen On LCD Panels

Views : 591
Author : China lcd panel factory
Update time : 2019-08-29 17:09:42
What is a white screen? After the LCD display screen is turned on, the display screen is full white (white screen) fault, this is the fault phenomenon of boot display screen white screen. 

a. Principle error, LAYOUT error. IM0, IM3 connection error, left and right connection is reversed, one of the lead error, power cord connection error, ground wire did not connect and so on. 100% bad. 

b. The test rack connection is wrong. IM0, IM3 connection error, data cable connection error, power cord connection error, ground wire not connected and so on. 100% bad. 

c. Program error. 8 to 16 selection error, high, low 8 bit selection error (P0, P2 port), initialization code error, program reset time is not enough, a function was not called. 100% bad. 

d. Poor contact with the golden finger. Welded, there are tin clip, virtual welding. 

e. Poor connector contact. 

f. Welded FPC, gold finger broken. 

G. Virtual welding of components on FPC (virtual welding of voltage doubling capacitance, virtual welding of crystal resistance), damage of components (diode breaking). 
The crystal resistance is too small. 

h. Plug-and-pull connector, metal wire breaking at the reinforcement (partial wire breaking can be observed under the microscope). 

I. FPC compression joint is poor. There is a foreign body somewhere in the small golden finger, ACF conductive particles, crimping temperature, pressure during crimping, and so on. Cause one or more golden fingers to break or have too much contact resistance. 

J. IC has poor crimping. Abnormal pollution on IC PAD, conductive particles on ACF, crimping temperature, pressure, etc. Cause poor contact (open circuit) or excessive contact resistance of one or more key PAD. 

Summary: the cause of the white screen is divided into two aspects of software and hardware, the software needs to find the analysis program, the hardware part is a certain place to break the line or short connection. Generally, the, VGH, VGL does not boost when the screen is white.
Related News
Read More >>
Market Prospect of Outdoor LCD Advertising Machine Market Prospect of Outdoor LCD Advertising Machine
May .25.2022
The outdoor LCD advertising machine uses LCD monitors to play video advertisements, which is especially suitable for the comprehensive multimedia technology of high-end brands to deliver a full range of product information and promotional information to consumers. Different from newspapers, magazines, radio, television and other media, LCD advertising machine has a wide range of applications and remarkable effects.
Comparison of 3 Different Models of BOE 18.5-inch LCD Screen Comparison of 3 Different Models of BOE 18.5-inch LCD Screen
Apr .21.2022
There are 3 outstanding models of BOE's popular 18.5 inch LCD screen, namely the DV185WHM-NM1, QV185FHB-N81 and MV185WHB-N20, of which the MV185WHB-N20 is available in both normal and high brightness versions. So what's the difference among them?
3 Common Problems of Using Capacitive Touchscreen 3 Common Problems of Using Capacitive Touchscreen
Feb .24.2022
Users may encounter some problems when using capacitive touch screens. When using it for the first time, the user first correctly installs the driver needed for the capacitive touch screen according to the requirements of the relevant instructions, and then runs the screen calibration program to calibrate the screen. In fact, the touch screen will be calibrated before it leaves the factory, so end users don't have to worry. In addition, users may encounter the following three situations when using a capacitive touch screen.
3 Differences Between Assembly LCD Module and Original LCD Screen 3 Differences Between Assembly LCD Module and Original LCD Screen
Feb .17.2022
In the LCD display screen industry, LCD has been called two ways, one is the assembly LCD module, the other is the original LCD screen. Do you know the difference between them? To sum up, there are three main obvious differences.
Know more about LCD technology?