Mojave on the 11 11” i5/4/512 was a tad slow so I decided to drop my Mavericks image on it. This little guy is flying. Setup a small 130GB iTunes library and doing a Monterey export of my photo library for iPhoto which is about 160gb. It’s a 108 in SA today, good day to stay in the AC and play with old Macs..
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Your post motivated me to pull out my MacBook Air and comment on it as there's rather an unusual repair story involved.
It's a mid 2013 MBAir6,2/ i5/ 1.3GHz/3/125 so spec-wise nothing special. It was my sons, who complained that several of the keys had failed to respond. I gave him a few tips, such as shaking/tapping it whilst upside down, then using a can of compressed air over the keyboard etc, but no success. What was a death-blow to the Macbook was that major vowles, the 'i', the 'a' and the 'e' plus one other on the Canadian QWERTY keyboard were not responding, making any serious typing impossible. I believe he had one very costly quote for repair which would have required a replacement top casing. He deemed this non cost effective and I agreed as at the time it was over 7 years old.
On his next trip to Europe he brought it with him and gifted it to me, saying, "If anyone can repair this correctly Dad, I'm sure you can".
Initially I wasn't too confident, especially whether it was worth purchasing a top casing. Then one weekend I saw an on-line video which showed that it was possible to change out just the keyboard, something that Apple repair 'specialists' would never have performed due to the complexity/repair time involved.
In the past I've completely torn-down and restored several Clamshell iBook's and two 12" G4 PowerBooks, so after the 12" PBooks thought surely nothing can be trickier. Plus I enjoy a challenge.
Having purchased from Amazon a replacement keyboard plus a bag of screws for the princely sum of 27euros ($26) I set to work.
The logic board needed removal to gain access and tear-away the keyboard backlight cover, followed by the rather daunting task of removing 100+ small screws partially retaining the keyboard, then by using brute force to overcome fixed plastic rivets, tearing the keyboard away from the underside of the topcase - all this a veritable demolition process! Seeing the wreckage remaining I thought to myself, '
Surely this MacBook will never live again'. I noticed a number of rivet heads remaining on the topcase which had to be removed, either with a dremel or small screwdriver. I used the latter. The rest was relatively straightforward, a reversal process using the replacement keyboard & screws.
At this stage, prior to reinstalling the logic board I thought it made sense to pop off the heatsink and repaste the CPU, a simple task.
Finally all was completed, and I pressed the power button not knowing quite what to expect after the MacBook demolition.
Et voila! It booted satisfactorily and all the keys were again functioning as expected.
I'd purchased a Qwerty keyboard as a replacement thinking my son may want the MacBook returned. He didn't, so I've added a silicon overlay AZERTY as I'm now more familiar with that system.
It's gives great satisfaction to be able to resurrect an Apple loptop and put it to good use, as otherwise this model would have surely gone to landfill. It's still running 10.12.6 Sierra - which I'm more than happy with, and happily web browsing with the latest FireFox.