Actually, I don't know whether your computer is a notebook, a liquid monitor or a desktop monitor. As far as I know, there is an extra shoe.
What model is your computer?
Let's not talk about it, we can see if it is a problem of insufficient contact. We can also do a test ourselves. You can connect a monitor to your notebook and see if there is anything wrong with the graphics card. For the desktop, you can also connect a monitor to have a look!
If you are a laptop, you can read this passage:
Text/Luo
Everyone who turns on a white screen or uses a computer understands the meaning of this "white screen", but some people who use computers don't know enough about this white screen. How can an ordinary computer produce a white screen? Is it a screen quality problem or a damaged graphics card? Does poor contact between LCD screen and motherboard often occur? Why do some notebooks occasionally go blank? How can we determine the meaning of white screen?
With these questions, the author answered the meaning of white screen and the murderer who produced it in detail. First of all, white screen is a term in our maintenance industry. The start light can be lit, and the screen is blank, but you can hear the sound of entering the window.
Everyone needs to know how to calculate the white screen and whether the white screen is connected to the graphics card. Just connect the computer to the PC monitor and see if the display is normal (there is a port connected to the PC monitor at the back of the computer). If the PC monitor display and notebook screen display are both white screens, then the graphics card is more likely to be damaged. The graphics card of a notebook computer is divided into two groups of synchronous signals, one is the LCD screen and the other is the display port, so the best way to test whether to connect the graphics card is to connect the PC monitor.
Today, the customer sent Lenovo LEGEND)S300 for repair, and failed to start the white screen. According to the customer's understanding, the screen flashes occasionally, and the computer flashes badly. I didn't think it would affect the operation too much, so I ignored it. But one day, when I turned it on again, the screen was blank. I only heard the sound of entering the window and suspected that it was a contact problem.
Boot white screen
Boot black screen
There are four rubber particles at the four corners of the screen to cover the screws, so be sure to carefully look around for screws when disassembling to avoid damaging the shell. It should also be noted that when disassembling the shell, the force should be even, and the hand should not be pressed on the screen, so as to avoid crushing the screen with excessive force, and the consequences will be more serious.
There is a high-voltage strip lamp interface on the right side of the front of the screen, which is connected with the high-voltage strip. If you want to remove the tube interface, you can only start working when the notebook is turned off. Because the high-voltage line is powered by the motherboard 15- 19 volts, and the high-voltage coil converts the voltage of 10 volts into kilovolts to light the lamp, there is also a label on the high-voltage coil indicating: Precautions.
The high-voltage patch panel is a high-voltage patch panel with 15- 19 volts provided by the motherboard. After passing through the high voltage coil, the voltage of 10 volt is converted into kilovolt to light the lamp.
Carefully remove the pipe interface from the high-voltage line and gently put down the screen, so that we can see the connection line between the screen and the motherboard. In the lower left corner, it is obvious that the screen line is firmly fixed. In order to save worry, we need to reconnect the interface. Let's look at the model of the screen: (torisan-tm121su-02L07) 800 * 600 resolution. Now it is rare to see the low split screen of this interface on the market. In 2000, this type of screen was mostly used in Acer and Lenovo's 12 inch TFT notebooks, and now the mainstream LCD screen of notebook computers is 65438.
There is also a connecting wire above the interface.
There is also a connecting wire above the interface. The connecting wire supplies power to the resolution module of the screen from the output voltage of the screen circuit board. The lack of screen color may be caused by the output voltage of the resolution module.
Multiple sets of voltages of the screen motherboard chip are provided to the module through connecting wires, and the module outputs a steady-current voltage to the display transistor to light up. However, taking the white screen as an example, the voltage of the resolution module is not input now, which can eliminate the white screen caused by loose connecting wires.
The function of the resolution module is to distinguish the stable current and voltage of the transistor, so that the display screen can display colors normally. It should be mentioned that in our daily life, we can often see one or more bright lines on the LCD screen, and we suspect that the screen is caused by contact problems. The reason for the bright line is that the transistor is damaged. The violent impact makes the voltage unstable and damages the transistor. Therefore, laptops have to undergo several severe impact tests before leaving the factory. This is also one of the tests on the LCD screen.
Parsing module and its function
Keyboard part
We have basically checked the connection of the screen line, and then we will see if the connection position of the motherboard is loose. After opening the keyboard cover, we found that there is also a chip (DS90C3 13MID) at the connection position between the LCD screen and the motherboard to control the voltage stabilization of the screen. When the screen is in a protected or dormant state, this chip will control the voltage input and output to reduce the power consumption of the screen (we should have found that when we use the computer in use, the screen will automatically go into a dormant state as long as we turn off the screen and the host, and when you turn on the screen again, the screen will automatically light up).
circuit board
After all the interfaces were reconnected, we tried to turn on the computer again-the screen went blank.
After reconnecting all the interfaces, we tried to turn on the computer again-turn on the white screen, but the fault could not be ruled out. Finally, we further test whether the voltage input and output are normal. After removing the tape from the circuit board covering the screen, we can see that all four sides of the main chip (TORISAN-SLA402F4D) of the control screen are *** 168 pins, resulting in a white screen. If you don't test the ticket, you can't guarantee it, then use the instrument to test it.
First, we use a multimeter to measure whether there are four groups of voltage inputs of more than 3V at the interface of the chip output and input, and then measure whether the small capacitors and diodes around the chip have electrical inputs. As expected, the input voltage at the screen interface is normal, but there is no current output at the chip output. In this case, we first determine whether the chip is damaged, so we need to find the chip of the same model in the broken LCD screen of the same model for replacement. (Note here: Pay special attention to the temperature control when heating the chip with a hair dryer, because there is a thin liquid crystal film under the chip, so pay attention to the temperature control during heating. If it is too high, it may damage the backlight paper and cause white spots. If it is too low, it will not blow off the chip and chip pins. )
After replacement, put the LCD back into the tester again. Hard work pays off. If the killer of white screen is caused by this chip (TORISAN-SLA402F4D), then we can finally breathe a sigh of relief after troubleshooting. The author also talks about some little knowledge of protecting LCD screen here! First of all, our computers in use should rarely avoid switching LCD screens and shutting down the host; If you don't need to use the computer, you can adjust the hibernation time of the computer in the power consumption plan without turning it off, and the computer can hibernate; In daily life, don't knock the surface of the LCD screen easily with your hands or foreign objects. Clean the LCD screen with a soft cloth. (It is recommended to use eye cloth and notebook LCD screen for cleaning. When the computer screen flashes abnormally, you should pay attention. If you think there is a problem, you must find a professional maintenance point to check it, so as not to lose too much. I forgot to mention that there are many people and cars in society now, so don't rush into the car to compete with others regardless of the quality of the LCD screen! Go home and turn on the computer again only to find that the LCD screen has cracked. I was really in distress situation:) >
Reference:/N/2005-01-13/1512503541.shtml
Actually, I still suggest repairing it! Safer!
Some notebooks, such as Samsung 15 inch 15 1S and IBM 95 1 1, will be turned on normally after being used for more than three years, and then there will be repeated white screens or white screens-normal-white screens-normal, or blue tails or horizontal bright bands. This is a screen failure. The model of the screen is LTM 150XH-L0 1, and a chip lxd9181on the screen has poor thermal stability and must be replaced. Some maintenance departments in Beijing replaced them with chips removed from the old screen, which was fine at that time and the warranty period was short. After a while, there will be problems and it can't be used any more. Go back to him, it's guaranteed. If we use a brand-new chip, it won't break down again. Please come to me if you have such a problem! No one has repaired it. I 100% fixed it, and the charge was reasonable. Other brands will have this problem when using this screen. I can fix it.
6 Specializing in the production of DELL 15 inch LCD monitors.
The Dell E 15 10PB LCD produced after 2002 has a unified defect: it displays a white screen when it is turned on or irregularly displays a white screen after it is turned on. This is because a component is aging, so we have 10 minutes to solve the problem.
If it is the suggestion of liquid essence, did you apply for repairing it for several years before buying it! The LCD circuit is broken, the backplane and the housing are short-circuited, and even the screen wires fall off. The LCD body is fragile. Suggest repairing it. The biggest possibility of desktop is memory problem. You can unplug it and plug it in to see if it's ok. I've heard several people say that.
Actually, I don't know much. I saw it online, too. I hope it will help you a little.