How to repair keyboards of laptop

On the keyboards, each button is responsible for a separate function. we need to scrub away the broken keyboards. Sometimes, we see much dust on the keyboards, we can scrub it away with the alcohol of deepness of 97 percent, especially for cleaning the bad keyboards. Besides, do not forget to erase the dirt in it. We can use the small brush, but we must act softer. Something serious would be helped by professional people. How to avoid the dysfunction of the keyboards is very important.
First we need to know some principle of its running. Keyboards is the common part in a computer, it is always made of the buttons, electric plastics, decoder and interface circuit. Perhaps no one know, the state of laptop keyboards have something to do with our using method. Some one’s laptop keyboards encounter something trouble of its running and shedding with the keyboards.Something bad, such as, plug of keyboards is broken, line problem, damage of mainboard or malfunction of CPU. But I think these are not the reason. Some way to repair it can be like this, we can disconnect the keyboards. To keep its buttons down, this is to protect the plastics dropping down on the floor. Then we had better open the line board. Line board is usually made of the very soft plastic as a thin film.