Computer Motherboard Repair 7 Big Summary

One, the CMOS parameter is lost

After booting the prompt "CMOS Battery State Low", can sometimes start, use a period of time after the crash, this phenomenon is mostly caused by insufficient CMOS power supply. For different CMOS power supply modes, different measures are taken:

1. Welding battery: Re-weld a new battery with a soldering iron.

2. Coin-cell battery: direct replacement.

3. Chip: Replace this chip preferably with the same type of chip replacement. If the battery after the replacement of a long time 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 jumper external battery.

Second, the motherboard keyboard interface can not be used

Connected to a good keyboard, post "Keyboard Interface error" After the crash, unplug the keyboard, re-insert after the system can normally start, using a period of time after the keyboard does not respond, this phenomenon is mainly a number of unplugged keyboard caused the motherboard keyboard interface loose, Remove the motherboard with a soldering iron to re-weld it, or it may be a live unplugged keyboard, causing the motherboard on a safety block (labeled FN on the motherboard), put on a 1 ohm/0.5 watts resistor.

Third, the display adapter integrated on the motherboard failure

Generally speaking, the computer starts ringing a few sound, most of the motherboard memory is not plugged in or display adapter failure. There is a great Wall microcomputer, the power-on sound 8, to determine the display adapter failure. Open the chassis discovery display adapter is integrated on the motherboard without the motherboard instructions. In this case, carefully review the jumper markings on the motherboard, screen out the integrated display device on the motherboard, and then plug in the expansion slot with a good display card after troubleshooting (some motherboards may be using CMOS settings to allow or disable the feature).

Four, the printer integrated on the motherboard and port damage

Brand machine and most more than 486 of the microcomputer printer and the port, mostly integrated in the motherboard, when using the machine when charged to unplug the printer signal cable is most likely to cause damage on the motherboard and the port. In a similar situation, you can view the motherboard manual and set the parallel port function on the "shield" motherboard by "Disable or allow the parallel port function on the motherboard" related jumpers. The other is shielded by a CMOS setting and then a multi-function card is added to the ISA expansion slot.

Five, the motherboard soft, hard disk controller damage

From 486 onwards, most motherboards are integrated with a soft, hard drive controller. If the floppy disk controller is damaged, you can also follow the above method with a multi-function card (change the motherboard jumper or CMOS settings), if the hard disk controller is bad, for different situations: if the drive is less than 528MB, you can add a multifunction card; Need to update the motherboard BIOS or take advantage of the relevant software.

Six, the motherboard cache damage

The cache on the motherboard is corrupted, showing that the software is running dead or not installed at all. The "External Cache" entry can be set to "Disable" in the CMOS settings after troubleshooting.

Seven, the motherboard on the switch power supply damage

The main power supply on the motherboard is switching power supply, the power pipe used for the separation device, if there is damage, as long as the replacement of power tubes, capacitors and so on.