The performance of the black screen phenomenon of computer LCD monitor LCD screen inside the high-pressure lamp or inverter damage, no display, but the system can not start properly, that the hard disk read data, the operating system can issue start successful music. Connected to the LCD signal cable breakage or poor contact, computer LCD monitor is blank, but vaguely still dim display, the system can also start properly, that hard read data, the operating system can issue start successful music.

Graphics card failure, if it is for this reason, the maintenance cost is very high.

Get the machine to do the initial detection. Connected to a laptop computer CRT monitors external display interface, and then displays the state to switch to the CRT mode, the display is all normal, basically ruled out the possibility of damage of the motherboard and graphics card. But when again to switch back to LCD mode, but it can normally moment, brightness, same as usual, but only for about a few seconds, they become odd dark incomparable. Checked, my initial impression is the motherboard, video card is not bad, vague showed little something LCD and cable is not damaged, it seems likely not lit backlight.

In fact, the LCD itself does not light, adjust the appearing and brightness of the image depends on the adjustment of the backlight brightness. The work of the LCD screen, the light emitted by the backlight through the LCD screen, LCD display thing that catches the eye of love, then we can see the text and images on the LCD display, if you used the microscope, then , saying the principle is similar. If the backlight is damaged, there is no light issue, when we could not see anything. However, if we carefully observe the LCD screen, you will see a faint image display on the LCD screen, then it means that the backlight circuit is broken. This is something like a thin fluorescent tubes like around the back of the LCD, powered and lit by the screen inverter to it, it emits light through the LCD panels, LCD will have a dazzling display.

In general, the backlight is not lit two reasons: the backlight lamp burned or damage to the high voltage circuit driving lamp. The high-voltage circuit board works is the motherboard provides low-voltage direct current through the switch circuit is converted into high frequency high voltage backlight tube lit. It can just press the power button to start the ear against the border of the screen, listen, Zizi sound of clicking, then silent, generally is the problem of high-voltage circuit board, if you have been silent, it may Lamp problem. The judgment in this amateur conditions, though not very professional, but it is quite practical.

LCD backlight generally work in a high-voltage, high-current state, after a few years of use, prone to dark screen or boot screen some time dark or black screen phenomenon, generally caused due to the inverter, which is also a small lamp caused mainly in the liquid crystal display of the LCD backlight. inverter failures are generally due to ignition coil leakage, breakdown caused by the switch, but the general ignition coil replacement more difficult to match, it is generally a direct replacement of the inverter, the inverter to a single lamp, dual-lamp-like, four-lamp inverter, according to the inverter lamp the number of tubes selected to replace the inverter.


Select inverter identify the following voltage pin, the foot of the main power supply, typically 12V, interconnected with insurance, based on the typical characteristics of two ground pins, generally negative, connected with a large area of ​​copper foil, three lighting switch control pin, used to control the high voltage output of the LCD inverter, generally beside ON / OFF, four, dimming pin, used to control the brightness of the inverter lighting, generally marked with the ADJ substitution inverter method Precautions.

Roles: the role of the LCD backlight to provide a uniform brightness can be adjusted.
Composition: light guide, fluorescent tubes, inverter, inverter power supply circuit.
 

1, the light guide plate: it is emitted from the light of the lamp through the physical diffuse reflection liquid crystal panel to provide a uniform backlighting.

Failures caused by the light guide plate:
               Caused by loose water ripple: because of the light guide plate.
                 Leukoplakia: the surface of the light guide plate is dirty substances, only with water can not be cleaned with alcohol.
                 Brightness fuzzy luminous rate of less than: bad environment is wet, the surface of the light guide plate mist formation.

  
2, Lamp: it is the light source of the LCD screen, the LCD screen are linear lamp, cold cathode diameter 3.6mm, 3mm, 2.6mm, 2mm, 1.8mm, 1.2mm, etc., the tube diameter 1.2mm when the highest luminous efficiency of the lamp power consumption of the notebook are generally about 2W to adapt to the AC voltage range 450 ~ ~ 1000V between.

  Lamp failure caused by:
                 Dark screen: text image information, brightness
                 Screen yellow / red: lamp caused by aging, easy to find just machines
                 Red and flashing screen or red screen go dark immediately: Lamp serious aging caused
                 Insufficient luminous efficiencies, brightness unadjustable.

         
3, Inverter: motherboard provides DC low-voltage electricity into 450 ~ ~ 1000V high voltage alternating current, so that the lamp is lit, 5V, 12V, 16V, 19V, 20V DC operating voltage of the Acer TravelMate Timeline 8371 Inverter.

Inverter working conditions:
               VCC, then fuse
               GND
               Graphics open signal (3V or 5V)
               Brightness adjustment signal (3V)

     The Inverter of substitution:
              The new inverter is to be able to put the position of the original inverter.
              The supply voltage of the new inverter and the original inverter supply voltage.

Q: What precautions required to use the LCD?

A: The following is use the LCD's Note:

1) Recommendation / wet environment at room temperature, high temperature / high humidity will affect the life of the LCD monitor.

2) the intense temperature fluctuations will affect the performance of LCD displays, especially the low temperature will affect the brightness and response time. Recommended to work in a stable, clean environment, dust can cause internal circuit Compaq Presario CQ61-411WM Inverter failure.

3) Do not spill liquids into the monitor, For cleaning, turn off the power, detergent spray on a soft cloth to gently wipe.

4) liquid crystal display glass, the move should be to avoid the collision, vibration.

5) liquid crystal display surface of the multilayer films, carved with a sharp object is strictly prohibited.

6) Do not disassemble the LCD display, be sure of professional maintenance in case of failure.

7) long fixed screen, will decline in brightness, image retention phenomenon to increase, it is recommended to use the screen saver.

8) for a long time, please do not turn off the monitor, unplug the power cord.

In the liquid crystal displays inside. Have a piece of inverter, inverter is what role? The original LCD screen himself is not light, it is the source of the back light irradiation after screen out of the back light actual is lamp, also called a backlight, in the display inside some USES two and three, four and six tubes only, and liquid crystal displays of shapes and sizes relevant.

Lamp is very fine, installed in the internal screen display the two edges, by setting the device to light source to the screen surface, the two ends of the tube with electrodes, length as the CM, 34 CM, the lighting of the tubes in a moment general need light voltage 1000 V-2000 or so start high frequency voltage, lit up to 700 V or so commonly, so inverter is a can produce high frequency and high voltage power supply device of the lighting of the tube.

In the liquid inside of the inverter for Gateway W6501 and install the 1-3 GaoYaBao, outside the watch is a square components, it should be pointed out that at least one GaoYaBao inverter, because can light a lamp, is more of the two GaoYaBao assembly together can ignite two tubes, if the board according to have two or four GaoYaBao that must be used to burn four or six tubes only.......

In the actual maintenance due to all the detection circuit inverter tubes are with a control and protection of integrated circuits, so once a branch is out of order, will stop general work condition. In principle must be replaced the inverter, in order to protect the original and the integrity of the maintenance staff high some technologies will work to make the repair, but due to the elements are tiny and difficult and buy, can replace new. The merits of the inverter with use only the length of time to prove.

This is a quality is very good general 4 lamp inverter, used for 17-19 "LCD, after three years of use, the center has changed many, not a problem. So we through actual replacement, think that is a very good performance of the board.

Inverter must use good quality, because the long-term work in high voltage, after change can bring customer feel joy or trouble, especially in today's market economy, a penny a points goods, good goods is also there, but need to the test of the time to prove.

A, IBM notebook common fault solution:

IBM T series the machine problems are as follows:

Fault phenomena: T2X series appear dark screen. Solution: replace LCD Screen Inverter or tube.
Fault phenomena: T2X memory slots easily virtual. Solution: add welding memory slot.
Fault phenomena: T40/41 machine failing appear blue hold or take screen freezes phenomenon. Solution: add welding or to replace the video card.
T22 dark screen change screen line, general t22 screen line break strings love, is the 8 foot motherboard interface, and high pressure of the article third feet, love disconnected.
IBM machine failing: T30, T40 appear take screen. Solution: video card problem.
IBM T23 common fault inductance of the virtual machine next chipset without power supply in welding CPU
IBM X31 plus electric didn't turn on video card BGA
Lenovo E280S didn't turn on or memory screening but BIOS material easy to bad
Lenovo 210 dark sun screen
The machine has such dark screen, generally in high pressure can solve the article
Toshiba T21OO power board easy bad or a virtual welding
Lenovo the mainboard and ACER 125 in one of the general, the CPU power supply chip easy to empty welding, and welding.
Occurrence easy to burn out, standby current 0.14
Lenovo screen shaft easy to cause the sun 150 A/B shell burst
The 150 to 3205 virtual welding, fixed the N
Lenovo 150 boot white during: commissioning a seconds variable white during, add welding CPU power supply chip ADP3205, solve the problem
Lenovo E255, E260 appear memory alarm add memory or replace welding chipset
IBM600X, easy to offer 301 and 8613 error, the keyboard and the little red dot is broken
COMPAQ B2000, not on the electricity for occurrence.

Second, use MHDD software testing carrier of bad repair disk way:

Computer in an illegal shutdown frequent tip lost after the system files, reshipment system failure remains. Computer illegal shutdown damage easily hard disk, make hard disk produce bad way, explain system file partition is there may be bad way, thus can use MHDD software (http://www.txt48.com/soft/8178.html) test whether there is a bad word hard drive, if there really bad way, it can be used to repair MHDD software:

1, to prepare a entities MHDD software DOS startup U plate, and the computer's USB interface insert.

2, restart your computer, in not enter the system before "del" button to enter BIOS setup interface, choose the "Advanced BIOS Features" and "First Boot Device"-" USB-ZIP "menu, and then click" F10 ", and then save Settings exit BIOS setup program.

3, computer automatic restart after entering Dos state, in the command prompt next input "CD mhdd32" the order, then press "Enter" into the MHDD software for directory, then input "MHDD" state.

4, press "Enter" MHDD software can operate in MHDD the interface.

5, press "F2" button, the screen will appear hard disk status information, including hard drive brand, Numbers, sector number, the version number, the firmware version and capacity.

Six, in "MHDD >" prompt "scan" ordered the import, and then press "Enter".

7, then pop-up "Scan Parameters: SPACE or ENTER to change" dialog box, once again, the dialog to Scan can attribute set.

8, choose "Loop test/repair" option, press the "Space" will be the key its setting for "ON", and then follow the same method will "Erase Delays * DESTRUCYIVE *" option is set to "ON".

9, press "F4" button to hard disk can be scanned, the scanning process, will be in the form of color piece said the mountains of the interface state every wish on the right side of the list box lists the different color piece representative meaning. Scanning finish there will be "Time Spent" message that prompts the user for scanning all the Time of hard disk costs.

10, use MHDD software repair after playing hard disk, the input "exit", commands, and then press "Enter" exit MHDD program.

Three, appeared on "CPU fan error" the reason and the solution:

When the computer tip "CPU FAN ERROR PRESS F1 TO RESUME," "CPU FAN ERROR" what do you mean, not CPU, but auxiliary CPU FAN out of the question, what causes system suggests "CPU FAN ERROR", if solve "CPU FAN ERROR" tip? Here's a look at boot appear "CPU fan error" of the causes and solutions.

1, system BIOS't detect the speed of the CPU fan

The machine into the BIOS by Del options, into the Power-Hardware hand you will see three together were CPU FAN SPEED; CHASSIS FANSPEED; POWER FAN SPEED, will be the first to IGNORED, the second to N/A, the third into IGNORED.

2, fan doesn't work properly or speed is too low

Fan work time is too long, the inside of the lubricating oil dry, lead to fan speed slowing, the interior of the fan in some oil, increase the speed of the fans will reduce the temperature inside the box you, that doesn't make the CPU burn out.

3, fan the power cord meet wrong

General on the main board having multiple fan the faucet, CPU fan should be plugged in "CPU_F" the above, if not in the normal fan here though, but the mainboard can hint mistakes. Will the CPU fan power plug into the appropriate position, a general problem can be solved, to the laptop cooling the best method for the room is installed a wuhan gree central air conditioning, the previous period, the friend is changed into the gree air conditioning unit, with air conditioning, the temperature had significantly reduced.

4, boards the battery

Will the COMS setup on the mainboard battery come down and then wait a few minutes after back pack, then the mainboard COMS discharge restore default; Finally in the BIOS inside the default Settings. All of the above is boot appear "CPU fan error" tip of the causes and solutions, and the CPU fan and between silica gel didn't, cause quantity of heat to send out not to go out, in case dust too much can also lead to boot appear "CPU fan error" tips. Four, three kind of phenomenon that will be hard drive failure, need maintenance:

The most important is the computer hard drive equipment, computer hard disk is like a big warehouse, inside the storage is our most important data, it has a large capacity speed, etc. We will daily life, the study of important data files stored on the computer hard drive, but once the hard disk failure so the consequence will be unimaginable, so we in the usual use must maintain it. Generally speaking, hard disk failure before can have the following kinds performance:

1, appear S.M.A.R.T troubleshooting tips. S.M.A.R.T. namely "self monitoring, analysis and report technology". It can monitor head, disk, motor, circuit and other parts, the monitoring of the hard drive circuit and the monitoring software host to the prison was the running situation of the object and the historical records and the default secure value analysis and comparison, once appear secure value outside the scope of the situation, it will automatically to alert users. And the more advanced technology can reduce the running speed of automatic hard drive, put the important data file archived to other security sector, through the S.M.A.R.T. technology can effectively to hard disk fault prediction, improve the security of data.

2, can enter into Windows system, but to run the program error, and run disk scans also fail, often in the scanning time slow stagnant or even crash. This kind of phenomenon may be hard, but it also could be the Windows of the solvent soft fault, if ruled out the possibility of setting software can be sure is the hard drive failure.

3, in Windows initially crash. The situation is more complex, first should be ruled out the possibility of other parts out problems, such as memory quality is bad, fan stalled cause the system to overheating, or virus damages the and so on, the last if sure is a hard disk drive if it breaks down, and then further processing. We in peacetime to important data to have the good habit of backup at any time, so that was in hard disk failure when there's not. In addition, some special important data backup on CDS best again, so that they can more foolproof.

Encounter a laptop computer video, blank screen, I believe many of my friends will issue to the business to deal with. Back in the business of the warranty period free maintenance, but out of warranty to solve such problems are often high prices. Laptop computer belonging to high-density integrated products, hardware damage that can is to change the motherboard. But in fact, many times the video, a black screen is caused by some very simple questions, commissioning, replacement methods can be resolved. Here are some treatment for your reference:

A. Driver problem

Notebook computer driver is not prepared by the Company of the graphics chip, the chip company in providing chip, driven to the notebook vendors to write their own, so there may be some compatibility issues. Notebook computer drives the degree of release is extremely slow, generally six months or one year update. The 3D program is resolved, we can try to look at running the same Huaping, blank screen, if the problem goes away can be considered to be the Toshiba Satellite A215-S4807 Inverter OEM compatibility issues. Meanwhile, the driver file is damaged or lost, may lead to the phenomenon of fake crash, Huaping, black graphics runtime, to solve this problem just uninstall the old drivers, reinstall the driver can.

Two. Third-party software

Overclocking software enabled, if the memory frequency than the first, the picture is a map error, Huaping phenomenon is normal, also lead to serious crashes. Memory work in the non-normal frequency, the higher the frequency will only make their work to become unstable, especially vulnerable to an error occurs when reading and writing data. At this point, we need to reduce or respond to the default frequency can be.

Of course, as mentioned above is our most basic method in the investigation and notebook computers Huaping failure, the fault remains after debugging, we should be transferred from the hardware to start. In my personal experience, Huaping phenomenon of notebook computers are generally hardware Toshiba Satellite A110 Inverter OEM problems, software problems in the compatibility.

Three. LCD signal cable connection is bad

This is the first step we check the hardware. Huaping, black phenomenon is erratic, or the fault disappears after the surface of the pat and press the keyboard, this is often the result of poor contact LCD signal lines and interface. We just need to re-seated the corresponding interface to the Toshiba Satellite U305-S5077 Inverter OEM can be eliminated.

Four. Oxidation reaction

This is generally due to a result of the notebook computer is prone to a bad environment or long-term use, handling, we first LCD signal line interface removed, wipe the joints of the finger with rubber, and interfaces, moistened with a small amount of anhydrous alcohol cotton scrub is to remove the poor contact due to oxidation or contamination. After treatment, then the line re-connected, check plug and tighten it.

V. Memory problems

As part of the notebook graphics memory using Dynamic Video Memory Technology (DVMT, the Dynamic Video Memory Technology), part of the memory allocation for graphics memory. In actual operation, may be due to memory the internal structure of damaged, select this part as a memory chip and memory during the data exchange is often an error, resulting in Huaping, black, and even the phenomenon of death. When this happens, we can use the Replace method to replace the same size of memory to be checked. Of course, if the memory is integrated on the motherboard, we can only repair.

Six. Capacitance problem

RAMDACs (Random Access Memory Digital-to-Analog Converter) and the filter capacitor is to determine the two important factors of the graphics picture quality is good and bad. The quality of the work of the filter circuit and the capacitor quality is linked to each other, when using low-grade capacitors or capacitor characteristics of a reduced ability to Huaping black screen phenomenon flattering. In the settlement, we can first use a multimeter to check out the capacitance of the problem, and then replaced with the same specifications, so the problem can be solved.

Are more than say we can handle their own problems through the debugger, the replacement method can be solved (Note: This article does not mention the low-power design related Huaping problems caused by poor heat dissipation, as we all know, the laptop graphics controlled at temperatures very well, and finished products through rigorous testing at the factory, the manufacturers of heat dissipation problem will naturally thoughtful), but for those who can not fix the problem, such as: chip defects, integrated on the motherboard and memory damage. Encounter these problems, we can only laptop computer repair, the way to solve such problems is often to replace the entire motherboard, which is our DIYer can hardly be done.