Common keyboard Failure analysis

Fault Type one: interface problem

Failure phenomenon:

1, on the boot prompt "keyboard error or no keyboard present";

2, after the boot Windows started to Blue sky and white clouds when the crash.

The cause of the first failure is that the keyboard is not plugged in, the pins in the keyboard interface are bent, and the keyboard or motherboard interface is damaged.

Processing: Notice whether the three lights in the upper right corner of the keyboard blink when you turn on the boot if there is no flicker, first check the keyboard connection, and then observe the interface is damaged, using a multimeter to measure the keyboard interface on the motherboard, if the interface of the 1th, 2, 5 core of a core of the voltage relative to 4 core to 0 volts, indicating that the interface line has a breakpoint, Locate the breakpoint and re-weld it well. If the keyboard interface on the motherboard is normal, the keyboard is damaged and a new keyboard is replaced.

The reason for the second failure is mostly the keyboard and mouse, which can be installed correctly.

Fault type two: keyboard internal line failure

Symptom: When entering the text, press a key to appear two to three letters at the same time, or a row of keys can not output

Processing: The keyboard inside the line has a short circuit, you can open the keyboard to clean the inside of the keyboard, so you can solve (usually pay attention to clean the keyboard, the keyboard will be reversed to gently pat); for a row of keys can not output the phenomenon, it is because the keyboard is open, open the keyboard, to find the circuit breaker welding well.

Fault type three: key cannot bounce (see more in Enter, Shift, Ctrl, Alt)

Failure phenomenon:

1, the keyboard indicator lights flashing, the monitor black screen;

2, click the mouse to select multiple targets;

3, input text when the capital lamp out, but the letters are all capitalized.

Processing: Generally as long as the key will be stuck to restore the original position can be. But these keys may have a problem with the spring, and it will get stuck next time. It is best to take down the key cap, simple treatment, such as the replacement of spring.

The main reason for this type of failure is the poor keyboard quality. Everyone in the installation of the keyboard is not enough to pay attention or figure cheap, so that the purchase of inferior keyboard. In fact, we use the keyboard, the mouse frequency is very high, from the economic point of view than the use of strong and durable good keyboard, and now the ordinary good keyboard only fifty or sixty yuan, and its use time is inferior keyboard two or three times times more