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Änderungen an MacBook Air 13" Mid 2012: loose or rattling trackpad repair Einleitung

Bearbeitet von Marc Malkwitz -

Bearbeitung genehmigt von Marc Malkwitz

MacBook Air 13" Mid 2012: loose or rattling trackpad, "stop buffer" replacement repair
In some MacBook Air and presumably many other MacBooks with similar trackpads, thesethe trackpad tend to become loose or rattle after a couple of years. It is a often read mistake, that this can be adjusted or "repaired" by the central adjustment screw of the trackpad, which (marked in step 10). This will only make it worse. The as the reason for the loose trackpad however can be found in the failure of two tiny buffers, that work as upper stop of the trackpad. Tiny as they are, no one seemsfew seem to know them and unsurprisingly they fail after thousands or even millions ofcountless workcycles. I did not find them as spare part but please leave a comment, in case they are avialable. I will then update this guide.
In rest position, they press the trackpad against the contact point of the mentioned adjustment screw and the click button. When you click, they decompress and when you release, they are recompressed by the bounce of the click button, which explains why their elastic force must be rather small.
Steps 1-11 base on older guides, which contain the some wrong information: '''Do not follow step 10!''' The mentioned screw is only for adjustment of the clickpoint and '''must not be unscrewed'''. The trackpad already comes out after Step 8
In this working position, we act directly above the display. So better place a thick cloth or any other protective material between screen an lower case before you begin.
Replacement of two tiny parts"stop buffers", that are responsible for Mac trackpads (presumably many unibody models) getting loose or beginnig to rattle