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19. The principle of LCD screenLCD Working principle Analysis:1.LCD Hardware Architecture:LCD hardware system: You can see the LCD controller is in the ARM processor, with a cable to the LCD screen and the processor connected together. The middle is through the
point of the motherboard voltage, to pay attention to the voltage (4.8V), reset voltage (high or low level, according to different models), MCU voltage. If a power supply short circuit, to carefully find short circuit position, there will be PCB board copper foil may be short circuit
(2) Find out whether the contact between the MCU and the motherboard is good
(3) Check whether the motherboard chip and MCU work, can be used to measure whether the crystal oscillator vibration
(4) Replace the M
How to control the display point of the LCD Module
1. display the ram zone ing
For the LCD module, it is very important to understand the relationship between the Display memory in the driver control IC and the points on the LCD glass. This is the basis for compiling the LCD driver program.
The driver control chip has
A few days ago, the customer brought a notebook computer, said that the screen appeared bright spots. He started to think it was the video card, but after reinstalling the video driver, the spot still existed. In fact, the LCD screen appears white spots mostly because of the physical damage to the screen. Notebook disp
After checking the following information on the Internet, some LCD screens are similar to plasma TVs. Unfortunately, my display found this problem yesterday. Fortunately, it is not a permanent injury, and it can be recovered after a period of rest.
The solution is to enable the monitor only when necessary. In addition, make sure that your operating system is in power-saving mode and the time is set to 10 ~ After 15 minutes, you can take a break when
Symptom: A friend in the beginning of the year replaced a 15-inch LCD display, the model is AOC LM-500, has been used very normal. But just after half a year, this LCD is a failure, the specific performance: As long as the start or restart the computer, there will be an approximate "flower screen" fault phenomenon, giving people the feeling as if there is high-fr
I haven't written a computer repair experience for a long time, think about it, big things, small things are quick to make me not like people, hehe! Well, today in the shop finally idle down to write a monitor repair feeling, just repaired a benqfp71e LCD screen boot black, the failure of BenQ machine has high pressure board part of the common problem, This should be recognized, the fault is mostly turned o
1, check the display and video card connection is loose
Poor connectivity between the hardware resulting in screen flowers, which is a more common flower screen.
2, check the screen resolution or refresh rate is set too high
The resolution of the LCD display exceeds the optimal resolution of the CRT display, the com
Symptom: A friend in the beginning of the year replaced a 15-inch LCD display, the model is AOC LM-500, has been used very normal. But just after half a year, this LCD is a failure, the specific performance: As long as the start or restart the computer, there will be an approximate "flower screen" fault phenomenon, giving people the feeling as if there is high-fr
1. One hand put the upper edge of the machine, pay attention not to press to the LCD screen. The other hand holds the bracket while pressing down on the base to prevent the machine from dumping when it adjusts.
2. The hand on the border pushes backwards, you can adjust the screen and tilt the angle about 18 degrees.
3. The hand on the border pulls forwa
Because of the particularity of the notebook LCD screen, LCD panel in the factory or in the use of the process is very easy to have a bad situation, once encountered them, if the manufacturers have a better policy to protect the point, can be replaced by distributors or return to plant repair, but if within the scope of the manufacturer's provisions (generally un
New purchase of 17-inch LCD display, the original CRT display replacement, post normal, but into the system desktop when the black screen, restart the problem is still there.
This problem occurs because the display's refresh frequency or resolution setting is beyond the LCD's support, as shown in the following solution.
1. Start the computer normally, press "F8" key when starting Windows, choose Safe Mode
Install Windows Optimizer Master, there is no requirement for selecting a standard or Professional edition. Run the program, switch to the "system detection → video System Information" column, the right pane will display including video card, display, supported display mode, video drive performance and other items, we need to pay attention to the contents of the "monitor".
View basic information for the LCD scree
display routine, is the use of PER_CLKOUTM2 as the clock source, the clock is 192MHz (actually PER_CLKOUTM2 clock is also flexible configuration, but not recommended, Because he is the clock is the core of clocks, if this change, the other peripherals also have to change, the impact is relatively large, so for the road clock to honestly use 192MHz, this description of TRM can refer to the TRM table 8-24. Per PLL Typical frequencies (MHz), so this gives a lot of people the intuitive impression t
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Target: LCD screen driver and display.
Understand the control method of gpio, and write a simple menu Test Program (including the display of colored Chinese characters and static pictures)
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I. Glossary
1. What is a gpio port? What are the related resources in mini2440?
A:
2.2416/2440 chip information on gpio ports (data
Burning screen before the phenomenon mainly occurred in plasma TV, now some LCD display also has a burning screen phenomenon. Burning screen refers to the permanent display of an image when the LCD display displays a still image for a long time, resulting in permanent imprin
In the CRT era, screen flicker is a common fault, usually caused by insufficient refresh frequency of the display card. Many users do not know what the refresh rate is, plus the system default is 60 Hertz, many users often use a lot of years low refresh rate to understand the CRT screen can not flicker.
To the liquid crystal display era, environmental protection without radiation, and no flicker and othe
const *const LCD_FILE = "/sys/class/backlight/pwm-backlight/brightness";
As
char const *const LED_FILE = "/dev/an30259a_leds";
This should be the node that prompts the light, regardless of him. Then, under mm, we get a lights. Default. So, and replace this. So.
There is also a permission issue. To open this node, you need permissions. Then you can add the permissions in init. XXX. RC.
chown system system /sys/class/backlight/pwm-backlight/brightness
OK. In this way, the android UI that adjus
Starting from my job search... er, is it too far away? In short, it is the highlight of the LCD display that the company has provided me after work, that is, the kind of LCD display that Asus claims will never appear in their notebook. The highlight is: in the pure black or white background, the point is always green. Because it is a company computer, no one has asked about the warranty, so I have to endure
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