What if the motherboard can start and not show?

The motherboard can start a workaround that does not appear:

First: You can go to the BIOS settings inside the BIOS interface settings, which you can refer to your motherboard instructions, if it is a notebook or brand machine, you can also refer to its instructions. The different branding settings will not be the same. This is no way to teach you how to operate.

Second: You install the dual system is not arranged in a different letter, if both systems are installed in the same letter. I'm sorry to tell you that you can only look forward to the system installed behind you, the front of the system is gone. If installed in different letter, you can point tool to folder selection options. Choose to display the files protected by the system, and all files and folders will be displayed. In the C disk to find a Boot.ini file, to modify the start time and related parameters on it.

You can also enter Msconfig in the beginning to the run, which should have a boot.ini choice.

Computer boot no display of troubleshooting methods:

The 1th step: first check the computer's external wiring is connected, the various lines plug again to see if the fault is excluded.

2nd step: If the fault is still, then open the mainframe box to see if there is any excess metal in the chassis, or the motherboard deformation caused by the short-circuit, smell the chassis has no burnt paste flavor, the motherboard has no burned chips, the CPU around the capacitor is damaged.

3rd step: If not, then clean the motherboard dust, and then check the computer is normal.

The 4th step: If the fault is still, then unplug the motherboard on the reset line and other switches, led lines, and then use a screwdriver short-circuit switch, see whether can boot.

5th: If you can not boot, and then use the minimum system method, the hard drive, floppy drive, optical drive data cable unplug, and then check whether the computer can boot, if the computer monitor appears on the screen, then the problem in these several devices. Then one by one the above several devices into the computer, when the access to a certain device, the failure to reproduce, indicating that the fault is caused by this equipment, and finally focus on the inspection of this equipment.

6th step: If the fault is still, the failure may be caused by memory, video card, CPU, motherboard and other devices. Then use the interpolation method, the Exchange method and other methods to check the memory, graphics, CPU and other devices are normal, if there are damaged equipment, replacement of damaged equipment.

7th step: If the memory, graphics, CPU and other devices are normal, and then the BIOS discharge, using isolation method, the motherboard is placed outside the chassis, the memory, graphics, CPU, etc. for testing, if the computer can be shown, and then the motherboard installed in the chassis test until the cause of the failure found. If the failure is still required to return to the manufacturer to repair the motherboard.

8th step: The computer boot without display but there is alarm sound, when the computer boot up, the system BIOS began to post (Power-on self-test), when the computer detected a fatal error in a device, then control the speaker issued a sound report error. Therefore, there may be no power on the display of alarm sound failure. For computer boot without the alarm sound failure can be based on the meaning of the BIOS alarm, to check the failure of the equipment to troubleshoot.

Additional Computer motherboard repair methods:

First, the method of debugging:

1. Will suspect the chip, according to the manual instructions, first check the input, output is the signal (wave type), if there is no out, and then check the IC control signal (clock) and so on, if there is the possibility of this IC bad, no control signal, traced to its former pole until the damage to find the IC.

2. Find the temporary do not remove from the pole can choose the same model. or program content of the same IC back on the top, turn to see if the improvement to confirm the IC is damaged.

3. Use tangent, borrow jumper method to find short route: found some lines and ground, +5v or other IC should not be connected to the foot of the short circuit, can cut off the line to measure, to determine whether the IC problem or the board line of the problem, or from other IC to borrow signal welding to wave-type wrong IC to see if the picture is better, judge the IC's good or bad.

4. Control method: Find a piece of the same content of a good computer board to measure the corresponding IC PIN wave type and its number to confirm that the IC is damaged.

5. Using Microcomputer Universal Programmer (ALL-03/07) (expro-80/100, etc.) in the Ictest Software test IC.

Second, check the Board method:

1. Observation method: There is no burning paste, burning, foaming, plate surface disconnection, corrosion of the socket.

2. Table measuring method: +5v, GND resistance is too small (under 50 ohms).

3. Power check: On the clear already bad board, can slightly adjust high voltage 0.5-1v, after the boot with the hand washboard on the IC, so that the problem of the chip fever, thus perceiving out.

4. The Logic pen checks: to the key suspicion IC input, the output, the control pole each end checks the signal to have no, strong or weak.

5. Distinguish the major work areas: most of the board has a clear division of labor, such as: Control Area (CPU), clock area (crystal oscillator) (frequency), background screen area, action area (people, aircraft), sound generation of synthetic areas. This is very important to the in-depth maintenance of the computer board.

Third, the computer chip disassembly method:

1. Shear footwork: No damage to the plate, can not be reused.

2. Mop Tin Method: In the IC feet on both sides of the welding tin, the use of high-temperature iron to drag back and forth, while the IC (easy to damage the plate, but can be preserved test IC).

3. Barbecue method: In the alcohol lamp, gas stove, electric stove on the barbecue, and so on board tin dissolved after the IC (difficult to grasp).

4. Tin Pot method: In the electric stove for the special tin Pot, after the tin dissolved, will unload on the board of the IC immersed in the tin pot, you can play an IC without damage to the board, but the equipment is not easy to make.

5. Electric wind Gun: with special electric wind gun unloading, blowing to unload the IC pin part, you can turn the IC after the tin (pay attention to the blow plate to shake the wind gun will also blow the computer board bubble, but the wind gun cost is high, generally about 2000 yuan)

As a professional hardware maintenance, board maintenance is one of the most important items. Take over a faulty motherboard, how to determine the specific components of the problem?

Main cause of motherboard failure

1. Human failure: Live plug I/O card, as well as in the Board card and plug when the improper force caused to the interface, chip and other damage

2. The environment is bad: static electricity often causes the motherboard chip (especially CMOS chip) to be penetrated. In addition, the motherboard encountered power damage or power grid voltage instantaneous spike pulse, often damage the system board power plug near the chip. If the motherboard is covered with dust, it will also cause a short circuit signal and so on.

3. Device quality problem: Due to the poor quality of chips and other devices caused by damage.

Four, cleaning

The first caveat is that dust is one of the biggest enemies of the motherboard. It is best to pay attention to dust, the brush can brush lightly to the dust on the motherboard, in addition, some cards on the motherboard, chip using the form of pins, often because of the oxidation of the pins and contact poor. Use eraser to surface oxidation layer, reseat. Of course we can use trichloroethylene-volatile performance, is to clean the motherboard of one of the liquids. There is a sudden power off, to turn off the computer immediately, so as to avoid sudden calls to the motherboard and power to burn. Process.

Five, BIOS

Due to improper BIOS setup, if overclocking ... Can jumper clear place, pick reset. If the BIOS is damaged, such as a virus intrusion ..., you can override the BIOS. Because the BIOS can not be measured by instrumentation, it is in the form of software, in order to eliminate all possible causes of the motherboard problems, it is best to brush the motherboard BIOS.