Computer motherboard Failure Encyclopedia

Computer motherboard breakdown encyclopedia, as follows:

First, the boot does not display class failure

"Instance 1": Motherboard does not boot, boot no display, there is memory alarm sound ("tick" to call Non-stop)

Fault reason: Memory alarm fault is more common, mainly due to poor memory contact. For example, the memory strips are not standard, the memory strip is a bit thin, when the memory is inserted into the memory slot, leaving a certain gap; the gold finger of the memory strip process is poor, gold finger surface gold-plated bad, time a long, gold finger surface of the oxide layer gradually thickened, resulting in poor memory contact; The memory slot quality is inferior, The reed touches the golden finger of the memory bar and so on.

Treatment: Open the chassis, with the eraser carefully to the memory of the gold fingers wiped clean, the memory strip down to plug in, with hot melts the memory slot on both sides of the gap to fill, to prevent the use of the process to continue oxidation. Note: When you unplug the memory bar, be sure to unplug the power cord from the host to prevent accidental burning of memory.

"Instance 2": Motherboard does not boot, boot no display, there is a video card alarm sound (a long two short tweets)

Failure reason: Usually the video card is loose or the video card is damaged.

Treatment: Open the chassis, the card can be inserted again. To check whether there is a small foreign body in the AGP slot, it will not plug the video card into place; for motherboards using voice alarms, the content of the voice prompts should be carefully identified, and the corresponding faults resolved according to the content.

If the above method is also reported to the police, it is possible that the card chip is broken, replace or repair the graphics card. If you hear the "beep" after a self-test passed, the monitor is normal but there is no image, the video card inserted in other motherboards, the use of normal, that is, the graphics card and the motherboard is not compatible, you should replace the video card.

"Instance 3": Motherboard does not boot, boot no display, no alarm sound

Fault reason: There are many reasons, mainly in the following several.

Treatment: For the following reasons, exclude each. Requires you to be familiar with digital circuit analog circuit, will use multimeter, and sometimes need to use the debug card to check the fault.

(1) CPU-related issues

CPU does not have power: Use the multimeter to test the three (or one) field tube around the CPU and three (or one) rectifier diode, check the CPU is damaged.

CPU socket has a shortage of needles or loose: This type of fault performance is not lit or irregular crash. You need to open the upper cover of the CPU socket surface and carefully observe whether there is a deformed pin.

CPU Socket Fan Fixed clamp fracture: You can consider using other fixed methods, generally do not replace the CPU socket, because manual welding is easy to leave trouble. SOCKET370 CPU, its radiator is fixed through the CPU socket, if the fixed spring plate is too tight, the demolition must be careful, otherwise it will cause plastic clips break, there is no way to fix the CPU fan.

CMOS set CPU frequency is not: 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, such as the jumper can not find, as long as the battery off, to boot display into the CMOS settings after the shutdown, The battery can also be installed to let the CMOS discharge.

(2) There is a problem with the motherboard expansion slot or expansion card

Because the motherboard expansion slot or expansion card problems, resulting in the card, sound card, such as expansion cards, the motherboard does not respond, resulting in no display on the boot. For example, brute force disassemble the AGP video card, cause the AGP slot to crack, can cause this kind of trouble. (3) Memory problems

Motherboard does not recognize memory, memory corruption, or memory mismatch: Some old motherboards are more critical of memory, once plugged into the motherboard can not recognize the memory, the motherboard will not be able to boot, and even some of the motherboard has no fault prompt (tweet). In addition, if you plug in different brands and types of memory, it can sometimes cause such failures.

Broken pins or burns in memory slots: sometimes because of excessive force or improper installation method, the reed in the memory slot is deformed and broken, so that the memory slot is scrapped. Note: When inserting the memory strip, should force vertically, do not sway around. Before unplugging the memory strip, be sure to unplug the power from the host, prevent the use of the STR function when the memory is charged, burn the memory bar. In addition, do not install the memory back, so as not to burn the memory after the battery. But now the motherboard, generally have to prevent the design, will not insert the reverse.

(4) Motherboard BIOS is damaged

Important hardware data is stored in the BIOS of the motherboard, and the BIOS is a more vulnerable part of the motherboard, which is vulnerable to damage and can cause the system to fail to function.

This type of failure typically occurs because the motherboard BIOS is damaged by the CIH virus. After the general BIOS is damaged by the virus, the hard drive data will be all lost, you can detect the hard disk data is intact in order to determine whether the BIOS is damaged, when there is a debug card, you can also use the card on the BIOS led light to judge. When the BIOS boot block is not damaged, the monitor does not light up after startup, PC speakers have "beep" beep; if the boot is damaged, then power and hard drive lights are on, the CPU fan turns, but does not start, at this time only through the programmer to rewrite the BIOS.

You can also plug in the ISA video card to see if there is a display (if prompted, you can follow the prompts to operate.) If there is no boot screen, you can make an automatic update of the BIOS of the floppy disk, refresh the BIOS, but some motherboard bios is damaged, the floppy drive does not work at this time, it is recommended to find service providers, with the write code to the BIOS update file to write in the BIOS.

(5) There is a problem with the battery used in CMOS

When the power switch is pressed, the hard drive and power light are on and the CPU fan is turned on, but the host does not start. When the battery is removed, it can start normally.

(6) Motherboard automatic protection lock

Some motherboards have automatic detection protection function, when the power supply voltage is abnormal, or CPU overclocking, adjust the voltage is too high, will automatically lock stop work. The performance is the motherboard does not start, at this time can be the CMOS discharge and then add electricity to start, some motherboards need to open the motherboard power, hold down the reset button can unlock.

(7) The capacitor on the motherboard is damaged

Check that the capacitor on the motherboard is bubbling or exploding. When the capacitor is burnt by high temperature due to high or long voltage, will bubble or liquid, then capacitance capacity reduction or loss, capacitance will lose the function of filtering, so as to provide load current in the exchange of components, resulting in CPU, memory, related board work instability, performance is easy to panic or system instability, often appear blue screen.

"Instance 4": Motherboard temperature disorder, resulting in no display on the boot

The Asus P3B-F Motherboard is able to monitor the CPU temperature with a 2Pin temperature monitor line, inserted on the JTP pin next to the CPU slot. Later in the process of playing the game, the machine suddenly blue screen, restart, wait until the CD-ROM drive, hard drive since the test after the monitor actually does not light.

Failure reason: The temperature control line on the motherboard falls off, falls on the motherboard, causes the motherboard to enter the protection state automatically, refuses to add the electricity. Due to the high CPU heat now, many motherboards provide stringent temperature monitoring and protection devices. The general CPU temperature is too high, or the motherboard temperature monitoring system failure, the motherboard will automatically enter the protection state. No power up or alarm prompts.

Treatment method: Reconnect the temperature monitoring line, and then boot. Note that when your motherboard does not start properly or alarm, you should first check the motherboard temperature monitoring device is normal.

Second, CMOS type of fault

"Instance 5": The computer frequently freezes, when carries on the CMOS setting will also appear freezes the phenomenon

Failure reason: The motherboard design is generally poor heat dissipation or the motherboard cache problems caused.

Treatment method: If the motherboard is not good enough to cause the failure, you can touch the CPU around the motherboard components, you will find its temperature is very hot, in the replacement of high-power fan, the crash can be resolved.

If there is a problem with the cache, you can enter the CMOS settings, the cache will be prohibited. Of course, when the cache is banned, the speed of the machine will certainly be affected. If the failure is not resolved by pressing the method, the motherboard or CPU is defective and only the motherboard or CPU will be replaced.

"Instance 6": CMOS parameter is lost, boot prompt "CMOS Battery state is low", sometimes can start, use after a period of time freezes.

Fault reason: Most of this phenomenon is caused by CMOS power supply insufficiency.

Treatment method: If it is a welded battery, you can use soldering iron to reconnect a new battery, if it is button-type battery, you can directly replace, if it is a chip-type battery, you can replace the chip, preferably with the same model chip replacement.

If the replacement of the battery, the time is not long and the same phenomenon, it is likely that the motherboard leakage, you can check the motherboard on the diode or capacitor is damaged, you can also use external battery jumper.

"Instance 7": CMOS settings cannot be saved

Failure reason: generally because the motherboard battery voltage is not enough to deal with: replace the battery can be. If some motherboard battery replacement, still can not solve the problem, you should check the motherboard CMOS jumper whether there is a problem, sometimes because the motherboard on the wrong set of CMOS jumper to clear options, or set into an external battery, also makes the CMOS data can not be saved. If this is not the case, it can be judged that there is a problem with the motherboard circuit, it is recommended that you find professional maintenance.

"Instance 8": Motherboard antivirus not closed, causing system to fail to install

Install Win98 initial phase, the screen suddenly appears a black rectangular area, like what is prompted, then stop the installation. Adjust the display brightness and contrast switch is also invalid, with anti-virus software to kill the virus, and did not find any virus.

Failure reason: This phenomenon is more likely to appear on the newly purchased motherboard because, by default, the antivirus settings in the new motherboard bios are mostly enabled, so similar failures occur.

Approach: Read the motherboard instructions carefully. After entering the CMOS Setup program, the problem can be resolved by setting the Virus Warning (virus warning) option in the BIOS Features Setup (BIOS feature settings) to "Disabled" (disabled).

Instance 9 ": Mouse is not available when Windows is installed or Windows is started

An old 586 computer, the mouse is not available when you install Windows or when you start Windows, and after you replace the mouse, the fault still cannot be ruled out. Suspected is the motherboard PS/2 mouse interface failure, get professional motherboard detection point check ps/2 normal mouse mouth.

Cause of failure: IRQ setting error in CMOS parameters. Such failures are common in older 586 PCs, and newer motherboards generally do not have this problem.

Treatment: In the CMOS set up the power management bar, there is a modem use IRQ project, the options are 3, 4, 5 ...., NA, generally its default option is 3, set it to an interrupt other than 3, you can troubleshoot.

In addition, some of the older 586 computers, COM port and LPT port is relying on a signal connecting line to the chassis, the letter line of the connection, with the motherboard different and different, if the wrong approach will also lead to the mouse is not available, the following methods are generally two kinds:

(1) The signal line is connected with the connecting head according to the order of 1 to 9, and (2) the signal line is connected with the connection point, and the connecting line is respectively 1, 3, 5, 7, 9, and the following row is 2, 4, 6, 8.

Cause of failure: IRQ setting error in CMOS parameters. Such failures are common in older 586 PCs, and newer motherboards generally do not have this problem.

Treatment: In the CMOS set up the power management bar, there is a modem use IRQ project, the options are 3, 4, 5 ...., NA, generally its default option is 3, set it to an interrupt other than 3, you can troubleshoot.

In addition, some of the older 586 computers, COM port and LPT port is relying on a signal connecting line to the chassis, the letter line of the connection, with the motherboard different and different, if the wrong approach will also lead to the mouse is not available, the following methods are generally two kinds:

(1) The signal line is connected with the connecting head according to the order of 1 to 9, and (2) the signal line is connected with the connection point, and the connecting line is respectively 1, 3, 5, 7, 9, and the following row is 2, 4, 6, 8.

"Instance 10": Cache damage on motherboard

The cache on the motherboard is damaged, showing that the software crashes or cannot install the software at all.

Treatment: You can set the "External Cache" item in the CMOS settings to "Disable" after troubleshooting.

Third, I/O device operation is not normal fault

"Instance 11": Motherboard COM port or parallel port, IDE port failure

Fault reason: Generally is because of the user live Plug and unplug related hardware.

Treatment method: Can be replaced with multi-function card. But before replacing, you must first prohibit the motherboard with the COM port and parallel port, note that some motherboards even IDE port to prohibit, before normal use.

"Instance 12": the keyboard connector on the motherboard is not available

Connect a good keyboard, post, appear prompt "keyboard Interface Error" After the panic, unplug the keyboard, reinsert after the normal boot system, using a period of time after the keyboard no response.

Failure reason: Many times unplug the keyboard, causes the motherboard keyboard interface to loosen.

Treatment: Remove the motherboard with the soldering iron can be again. If it is a live unplugged keyboard, the motherboard on the previous security block (marked on the motherboard for FN), replaced by a 1 ohms/0.5 watts resistance can be.