- إنضم
- 23 فبراير 2009
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Notebook LCD Lamp Fault
Notebook at work, the LCD screen itself is not illuminated, it needs to achieve LED backlight lamp, that is issued lamp light transmission through the LCD screen out after that we can see displayed on the LCD screen content.From work on the principle that the notebook motherboard provided by entering the first low-voltage direct current step-up circuit board, through the switch circuit into a high-frequency high-voltage, and then lit LCD backlight lamp.
。 If after booting the notebook, liquid crystal display screen on the text or image is very dim backlight lamp that does not work in such a situation has the following two reasons: First, the step-up drive backlight lamp circuit damage; two tubes are their damage.
Although the whole LCD screen notebook are the most sophisticated, highest-technology components, but as long as the master of its working principle, bold, some cautious, do-it-yourself is entirely possible to resolve the fault. 当然， Of course, before hand, it is necessary to better prepare the following tools: electric iron, high-quality wire, rosin, blade, digital multimeter, screwdrivers, etc..
Step one: open the LCD screen of the shell. Decorative put us under the cover open and under the fastening screws, the LCD screen to open the shell (there is some notebook LCD screen at the side of the screw).开，ws in the screw, use a small screwdriver from the slot slightly to break open the Department and designated along the horizontal open to break open the Department to open
Note: At the time卡扣crowbar, screwdriver inside the machine not to be too deep to avoid damage to internal components, at the same time, when at卡扣should not pry too hard, otherwise it will create shell卡扣deformation or damage.
Step two: open the shell, you can see the notebook LCD screen the internal structure, and Figure 1 for the LCD screen lamp circuit work. Can be seen from Figure 1, up from the notebook's motherboard led a group of cable, the cable group's primary role is to provide current motherboard and control signals from the introduction of step-up board, and boost the role of board type of motherboard provided by 12V DC converter for the backlight lamp required for high-frequency high-voltage, while the control signal based on the main board to open or close the LCD screen lamp, adjust the brightness of lamp. 。 After the high-voltage step-up is transported to the LCD screen on the lamp and lamp-driven work.
The third step: to determine whether damage is caused by cable failures. 。 Input with a multimeter measuring the voltage step-up board and whether it is normal, or the whole notebook apart, measured by multimeter cable Whether or not there is open at both ends of situation.Cable such as are found in open, you can cut the cable at both ends and re-wiring, you can solve the problem.
Note: some notebooks are printed with a soft copper cable, the copper foil on the event of breakage is too much trouble, the best approach is to replace copper cable, such as could not be realized, can be closer look at the printed copper foil, to find open points, and wallpaper knife will scratch the surface of copper foil, electric soldering iron Express, you can solve the problem.
Step four: If there is no problem with cable, we can step-up board for testing. Detect Boost plate is the simplest way to boost test plate voltage output are However, because of step-up board up to a few kV output voltage, the test easily be inadvertently caused by electric shock or damage to step-up board. Therefore, the electron must have technical knowledge and equipment for the fans, I recommend using a multimeter or oscilloscope transformer oscillation detected very early, have a look if there is oscillation in order to determine the quality of step-up board.
As for the fans there is no test conditions, we can test pencil directly in the induction of the oscillation step-up transformer board or attachment to test the output line to see if there is induced voltage (in the test, simply open the notebook power supply, no need for removal of the output Plug and vibration on the protective shield of the transformer), which determine the step-up board is working correctly. However, because of some larger notebooks electromagnetic leakage, that may arise in this way the phenomenon of a miscarriage of justice. To avoid this situation, we can enter the first step-up board cable removal, open the laptop power supply, induction plate boost test pencil test whether there is electricity, if there is electricity test pencil show that electromagnetic leakage larger notebooks do not fit with test this approach.
Step five: If it is determined that cable and step-up board do not have any problem, it can be determined basically are caused by failure of the lamp. We can, as shown in Figure 2, fastening screws under the LCD panels, LCD panels will be removed from the base up to.
。 If after booting the notebook, liquid crystal display screen on the text or image is very dim backlight lamp that does not work in such a situation has the following two reasons: First, the step-up drive backlight lamp circuit damage; two tubes are their damage.
Although the whole LCD screen notebook are the most sophisticated, highest-technology components, but as long as the master of its working principle, bold, some cautious, do-it-yourself is entirely possible to resolve the fault. 当然， Of course, before hand, it is necessary to better prepare the following tools: electric iron, high-quality wire, rosin, blade, digital multimeter, screwdrivers, etc..
Step one: open the LCD screen of the shell. Decorative put us under the cover open and under the fastening screws, the LCD screen to open the shell (there is some notebook LCD screen at the side of the screw).开，ws in the screw, use a small screwdriver from the slot slightly to break open the Department and designated along the horizontal open to break open the Department to open
Note: At the time卡扣crowbar, screwdriver inside the machine not to be too deep to avoid damage to internal components, at the same time, when at卡扣should not pry too hard, otherwise it will create shell卡扣deformation or damage.
Step two: open the shell, you can see the notebook LCD screen the internal structure, and Figure 1 for the LCD screen lamp circuit work. Can be seen from Figure 1, up from the notebook's motherboard led a group of cable, the cable group's primary role is to provide current motherboard and control signals from the introduction of step-up board, and boost the role of board type of motherboard provided by 12V DC converter for the backlight lamp required for high-frequency high-voltage, while the control signal based on the main board to open or close the LCD screen lamp, adjust the brightness of lamp. 。 After the high-voltage step-up is transported to the LCD screen on the lamp and lamp-driven work.
The third step: to determine whether damage is caused by cable failures. 。 Input with a multimeter measuring the voltage step-up board and whether it is normal, or the whole notebook apart, measured by multimeter cable Whether or not there is open at both ends of situation.Cable such as are found in open, you can cut the cable at both ends and re-wiring, you can solve the problem.
Note: some notebooks are printed with a soft copper cable, the copper foil on the event of breakage is too much trouble, the best approach is to replace copper cable, such as could not be realized, can be closer look at the printed copper foil, to find open points, and wallpaper knife will scratch the surface of copper foil, electric soldering iron Express, you can solve the problem.
Step four: If there is no problem with cable, we can step-up board for testing. Detect Boost plate is the simplest way to boost test plate voltage output are However, because of step-up board up to a few kV output voltage, the test easily be inadvertently caused by electric shock or damage to step-up board. Therefore, the electron must have technical knowledge and equipment for the fans, I recommend using a multimeter or oscilloscope transformer oscillation detected very early, have a look if there is oscillation in order to determine the quality of step-up board.
As for the fans there is no test conditions, we can test pencil directly in the induction of the oscillation step-up transformer board or attachment to test the output line to see if there is induced voltage (in the test, simply open the notebook power supply, no need for removal of the output Plug and vibration on the protective shield of the transformer), which determine the step-up board is working correctly. However, because of some larger notebooks electromagnetic leakage, that may arise in this way the phenomenon of a miscarriage of justice. To avoid this situation, we can enter the first step-up board cable removal, open the laptop power supply, induction plate boost test pencil test whether there is electricity, if there is electricity test pencil show that electromagnetic leakage larger notebooks do not fit with test this approach.
Step five: If it is determined that cable and step-up board do not have any problem, it can be determined basically are caused by failure of the lamp. We can, as shown in Figure 2, fastening screws under the LCD panels, LCD panels will be removed from the base up to.