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The trackpad was jumping and selecting automatically what was displayed on the screen. Also from time to time it used to click by itself ... very annoying.
It was the third time I did. First time, I did it easily taking lot of time but the trackpad I bought was not running fine (the keyboard was not fully working, only part of it was working). For the precision, this first one I did not bought through ifixit. Second time, I decided to place the old origin unit back ...
Then I keep working like that for another 6 months. Then I decided it was not possible to work like this and bought a trackpad from ifixit ... double the price of the first unit. This time it worked!!!
The more you play with all these screws, the more they got "tired" ... the third time I wanted to open it, some screws were so "tired" that it was not possible to unscrew them with the P5 tool bought at ifixit.net. I finally went successful by using another tool provided also by ifixit but it was a little bigger so that I was able to unscrew the "tired" screw. Another tip is to scotch every screw on a piece of paper as you go through the steps, so that you dont loose these screws.
I spilled coffee on the trackpad and keyboard
I used the guide for replacing a top case in order to take apart the computer. Based off of advice I read, I cleaned the parts with 91% isopropyl alcohol. The keyboard cable was crusted in coffee, as was the entire trackpad. I cleaned these off with the alcohol and a baby toothbrush. After putting it back together, the keyboard worked perfectly, but the trackpad was still wonky (wouldn't click and cursor jumped around). I ordered a new trackpad from the ifixit store and used the guide to replace it, and now the computer works perfectly!!
Apple quoted me $755 to "fix" my computer. I did it myself for about $130.
The process of taking the Macbook Air apart was a lot easier than I thought it would be. It was just a bit time-consuming. Definitely use the pentalobe screwdriver- I stripped some screws because I was overeager while waiting for my screwdriver to come in the mail, and had to go to a computer repair store to get them back out to replace the trackpad (they were super nice and didn't charge me anything for removing the screws).
Be careful not to over-tighten the screws that keep the battery in place. I cracked the plastic a bit this way.
Trackpad on MacBook Air was not responding no matter what I did to adjust it. It took about one hour to replace the trackpad. The only complicated parts were attaching the ribbon cables back on. They are a bit fragile.
After installing the new trackpad from iFixIt, my MacBook Air was good as new!
Be careful of the ribbon cables.