Motherboard common Failure Analysis and solution _ Hardware Maintenance

First, no display on the boot
Computer boot without display, the first thing we consider is the BIOS. Motherboard BIOS in the storage of important hardware data, but also the more delicate 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 does not exclude 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, because the motherboard expansion slot or expansion card problems, resulting in plugging such as sound card and other expansion cards after the motherboard does not respond without display.
2, for the current jumper-free motherboard, if the CPU set in the CMOS frequency is not correct, 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 will also lead to the failure of the boot display. Some older motherboards are more critical of memory, once plugged into the motherboard can not recognize the memory, the motherboard can not be lit, and even some motherboards do not give you any fault prompts (tweet), so that we take a lot of detours in the overhaul; and, of course, sometimes in order to expand the memory to improve system performance, the results plug in different brands, Type of memory can also cause such failures, so you should pay more attention when troubleshooting.
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).
For motherboard damage, some may be due to the motherboard with a long battery leakage caused by the circuit board moldy (for the old motherboard), so that the motherboard does not work, we can thoroughly clean it to see if the problem can be solved, this method also on the motherboard of the contact of the socket is not good for root.
Cleaning method: Use the tool to unplug the BIOS on the motherboard, the CMOS battery, then use the hard hair brush, washing powder, carry on the thorough cleaning to its each part, the final flush clean with the tap water, wait for the motherboard shade after try again (reliable to store a week later more safe).
Second, motherboard COM port or parallel port, IDE port damage
This type of failure is generally due to the user charged plug related hardware, at this time the user can use multi-function card instead, but in lieu of the motherboard must first be banned from the COM port and parallel port (some motherboards even IDE port to prohibit the normal use).
Three, CMOS settings can not be saved
This type of failure is generally due to the motherboard battery voltage is not caused by the replacement can be, but some of the motherboard battery replacement can not solve the problem, at this time there are two possible:
1, the motherboard circuit problems, to find professional maintenance;
2, the motherboard CMOS jumper problems, and some because of human failures, the motherboard on the CMOS jumper set to clear options, or set into an external battery, so that the CMOS data can not be saved.
Four, in Windows download into the motherboard driver after the crash or CD drive read disk speed slowed the phenomenon
This type of behavior can sometimes occur on some non-brand motherboards, and when the motherboard driver is installed, restarting the computer does not enter the Win98 desktop in normal mode, and the driver cannot be uninstalled under Windows98, allowing the user to reinstall the system.
In some magazines, it is found that loading the motherboard driver can improve the speed of the host and enhance the stability of the system, but in the current WIN98SE version, this version of 98 comes with newer device drivers, unless there is a device conflict under WIN98. There is no need to install the motherboard driver (of course, if you purchase a non-Intel chipset motherboard, it will depend on the installation situation, some non-Intel motherboards need to install the motherboard driver).
Five, the mouse is not available when you install Windows or when you start Windows
The software causes for such failures are generally as follows:
1, CMOS Setup error. There is a modem use IRQ item in the power management bar of the CMOS settings, and his options are 3, 4, 5, ..., NA, typically its default option is 3, and it is set to an interrupt other than 3. Such failures are generally common in older 586 PCs, and modern motherboards generally do not appear to be such a phenomenon.
2, in some of the older 586 computers on its COM port and LPT port is relying on a signal cable connected to the chassis outside, its COM port signal connector with the motherboard is different, the method is also different, if the wrong connection will also lead to the mouse is not available, it is generally followed by the following two kinds: 1, The signal lines are connected to the connection head in sequence 1 to 9. 2, the signal line and connection point cross connected, the connector above a row of connected signal Line 1, 3, 5, 7, 9, the following row is 2, 4, 6, 8.
Six, the computer frequently freezes, even if in the CMOS setting also will appear freezes the phenomenon
In the CMOS crash phenomenon, generally for the motherboard or CPU problems, if the dismount can not solve the fault, it will only replace the motherboard or CPU.
This type of failure is generally due to the motherboard cache problems or poor design of the motherboard, the author on the elegant 815EP motherboard has been found due to the motherboard cooling is not good enough to cause the failure of the phenomenon. After the crash, touch the CPU around the motherboard components, found the temperature is very high and hot. After the replacement of high-power fan, the crash can be resolved. For cache problems, we can enter the CMOS settings, the cache will be prohibited after the smooth solution to the problem, of course, after the cache is prohibited speed that will certainly have an impact.
Seven, the computer after the boot, run to the diagram as shown when the stop, but the computer did not panic
Award Soft Ware, Inc.
System configurations
This type of failure will initially be thought to be a hardware failure, but after repeated observation and practice, you found that the problem is due to improper CMOS settings caused. The options for the PNP OS installed (Plug and Play) items in the CMOS PNP/PCI configuration column typically have "yes" and "NO" two, which causes the above failure because the Plug and Play is set to "yes" and changed to "no" The failure was resolved. Some motherboards turn on the CMOS Plug and Play function, but also causes such as the sound card is not normal, such as the phenomenon, but also need to pay more attention.
Finally also need to note is: The computer motherboard brand many, mixed, fault performance is also strange, here are some of the fault analysis, also according to the corresponding maintenance experience with universal fault judgment, so these empirical analysis for reference only.