Laptop Keyboard Repair Doesn't Cost a Penny
As you may know, the notebook keys are thin and light, the workmanship is very fine, and the feel is also good. However, as long as the notebook keyboard is flooded, the keyboard must be scrapped. Because the conductive silver layer inside the notebook keyboard is easy to oxidize and rust in a humid environment, resulting in circuit disconnection or short circuit, making the keyboard unusable. Because the structure is too fine and the maintenance is very time-consuming, it is generally recommended that the customer replace the keyboard with a new one. However, a notebook key can cost four or five hundred yuan, which is very expensive. Today, I encountered a problem that the notebook keyboard couldn't be used. However, this time, I didn't replace the key, but I did a little surgery on the keyboard, which restored most of the functions of the keyboard without spending a penny. The situation is like this: my friend came to me with a Lenovo Zhaoyang s2809cfe laptop and said that the keyboard couldn't be used. There was no response at all. If you want to input a password on the Internet, you have to use Microsoft's soft keyboard and click one by one with the mouse. It's hard to die. However, the customer also found that the keyboard is not broken. If you delete the keyboard in Explorer, you will be prompted to find new hardware when you restart again, that is, the keyboard just deleted. However, pressing any key on the keyboard does not respond, and no letters can be entered. The reason for this is that when using the computer, the water in the cup accidentally spilled on the keyboard, and then this happened. A friend said that the keyboard was flooded. I didn't think about it. Let's change it. However, this time he is going on a business trip. If he wants to change, he needs to apply to the maintenance station and wait for the key to come back, it will certainly take a week, but he is in a hurry. I looked at the book. Anyway, it was over guaranteed. I opened it and checked it myself to see if the motherboard was flooded. Don't let the fault continue to expand. Zhaoyang's book is a slim small screen book, which is very light in workmanship. I observed for half a day and wanted to take down the keyboard alone. As a result, I didn't find any live pins around the keyboard. No, I can't take off the top cover of the whole book. Finally, I found that the keyboard of this book is fixed from the bottom of the book with two screws. The two screws must be removed before the keyboard can be removed by moving the keyboard. However, these actions need to be very careful. The keyboard of the book was busy for a long time and finally removed. However, if you want to take away the whole keyboard, you must also take off the upper cover of the whole book. This requires removing the three small screws under the battery, the two long spirals on both sides of the battery, and the other seven screws. There is also a screw in the memory box, which needs attention. The screw distribution is shown in the figure below.
My friend also told me in detail that the water inlet of the book is on the lower right side and the position of the direction key. I looked at the bottom of the keyboard. It turned out to be the CPU. There was a trace of water on the radiator. However, because the heat of the CPU was large, it did not flow to the circuit board at all, so the motherboard was not damaged. According to the situation reflected by friends, the keyboard can still be used at the beginning of water inflow, but it becomes more and more serious. Later, when starting up, it always sounds "didi". When entering the desktop, the cursor always runs straight to the right, and you have to press the left key. Later, it became what it is now. There was no response and no shouting. According to my friend, it is likely that the conductive silver layer on the surface of printed polyethylene film is wet and oxidized due to water, which may be connected together, causing the system to think that the "end" key is always pressed, so that other keys cannot be used normally, and the surface is mistaken for keyboard damage. Through such analysis, the fault can be solved. The key cap of the notebook keyboard is buckled on the bottom seat. When removing, just buckle the lower part of each key, break it up, and then push it forward to remove the key cap. Below is a rubber cap similar to the conductive rubber of calculator keys, but the rubber cap here has no conductive layer. At this time, you can see the conductive layer below. It should have been a bright metal layer, but now it is a black one. Needless to say, it is the problem here. Below are two thin sheets of polyethylene plastic with a conductive layer. The two films are very close, and the base of each key is riveted on the metal plate at the bottom. Therefore, the key seat must be pried up, but it is easy to break three rivets. However, I didn't intend to use the key again. I pried up the key seat with a little force, and two of the three rivets were broken. At this time, the polyethylene sheet can be separated with a blade or tweezers, and the oxide layer can be carefully erased with absorbent cotton dipped in a little anhydrous alcohol. Then connect the keyboard back to the computer, power on and test the machine. The problem is solved and the letters can be entered. Of course, if we have conductive silver paint in hand, we can also repair the corroded conductive silver layer as it is, and then the key can be repaired. However, it takes a lot of effort and is not easy to succeed. This is also good. I repaired the notebook keyboard that was supposed to be replaced without spending a penny, and the harvest is still not small.
Bao’an District Shenzhen City, China
+86 189 3806 5764
crowberry@laptoprepair.com
www.laptoprepair.com
