The motherboard does not display what to do

troubleshooting when the motherboard does not boot:

The first thing we need to check is the BIOS. Important hardware data is stored in the BIOS of the motherboard. At the same time the BIOS is also a more vulnerable part of the motherboard, very vulnerable to damage, once the damage will cause the system can not run, such a failure is generally due to the motherboard BIOS is CIH virus damage caused (of course, also do not rule out the motherboard itself failure caused the system can not run. )。

The general BIOS is damaged by the virus after the hard disk data will be lost, so we can detect the hard disk data is intact to determine whether the BIOS is damaged, if the hard disk data intact, then there are three reasons for the boot does not show the phenomenon:

1. There is a problem with the motherboard expansion slot or expansion card, which causes the motherboard to not respond without a display after inserting an expansion card such as a sound card. )

2. Jumper board in the CMOS set CPU frequency is not correct, it may also cause the failure to display, as long as the elimination of CMOS can be resolved. Clear the CMOS jumper is typically near the lithium battery on the motherboard, its default position is generally 1, 2 short circuit, as long as it is changed to 2, 3 short-circuit a few seconds to solve the problem, for the old motherboard if the user can not find the jumper, as long as the battery off, to boot display into the CMOS settings after the shutdown, The battery is also up to the purpose of the CMOS discharge.

3. The motherboard does not recognize memory, memory corruption or memory mismatch can also lead to the failure of the boot display. Some old motherboards are more critical of memory, and once plugged into the motherboard can not recognize the memory, the motherboard will not be able to start, and even some motherboards do not give you any fault prompts (tweet). Of course, sometimes in order to expand the memory to improve the performance of the system, the result of inserting different brands, types of memory will also lead to the emergence of such failures, so in the overhaul, should pay more attention to.

For motherboard BIOS damaged failure, we can plug in the ISA video card to see if there is no display (if prompted, you can follow the prompts step.) If there is no boot screen, you can make an automatic update of the BIOS floppy disk, re-refresh the BIOS, but some motherboard bios is damaged, the floppy drive does not work at this point, you can try to use hot Plug method to resolve (I have tried, as long as the BIOS is the same, in the same level of the motherboard can be successfully burned. )。

However, the use of hot-plug extraction requires the same BIOS may also cause some components of the motherboard damage, so the reliable method is to use the write code to the BIOS update file into the BIOS (you can find this service for the computer to solve the more secure).

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.