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Trackpad not working, but keyboard works fine

Hi all,

My Macbook Air suffered some liquid spill, but I was able to bring it back to life by replacing the Logic Board. But then I noticed the power button wasn't working, so I replaced the keyboard as well. It is now working fine.

Except I just realized that the trackpad isn't working (I forgot that it already wasn't working very well before the accident, now it's completely dead.

But the keyboard seems fine, and I'm able to use the computer with a mouse without any problems.

Most of the information I've found on trackpads is that they're linked to the keyboard, and most issues I've read advise to replace the top case. Since I have a brand new, functioning keyboard, I figured there's got to be another way...

Does anybone have a clue of what the problem might be, and what I could do to fix it?

Thanks a lot!

Update (02/16/2017)

Update: I replaced the track pad, and it allowed the click to work, but somehow the cursor still won't move at all when using the track pad. It does move normally when using a mouse, though.

Any idea what the problem might be at this point?

Thanks a lot!

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Is the battery swollen? Try it with the battery out.

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Yes, you can replace the trackpad without replacing the entire uppercase. Here's the IFIXIT guide you'll need to follow: MacBook Air 11" Mid 2011 Trackpad Replacement and here is the part you'll need: MacBook Air 11" (Mid 2011/Mid 2012) Trackpad - Apple P/N 922-9971

MacBook Air 11" (Mid 2011-Mid 2012) Trackpad张图片

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MacBook Air 11" (Mid 2011-Mid 2012) Trackpad

$109.99

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Just listen to this guy ^^^

Great, thank you Dan!

Is there any way I can make sure the problem is really the trackpad itself, and not the cable or the board for example?

I will replace it if necessary, but I want to be 100% this will do the job.

Thanks a lot!

Well, the cable is a feed-though design which supports the keyboard data stream as well as the trackpads. So if the keyboard is working that would imply the cable from the trackpad to the logic board was OK.

What board are you thinking of here? The main logic board? Or the board on the back of the trackpad? The board on the trackpad will be replaced with the trackpad. I can't speak about the main logic board here as long as it was the correct one I can't see that as being bad, besides it's working correct?

Thanks a lot for explaining the cable thing. That makes a lot of sense.

Out of curiosity I tried messing with the trackpad sensitivity screw to see if it would change anything. And for a second I managed to make the "click" work. But I still couldn't move the cursor or scroll. Does that mean the trackpad is just as good as dead? Or am I on to something?

The adjustment screw is just a mechanical limit for the click plate. It does not effect the tracking of the trackpad. To help illustrate things review how the Magic Mouse tracking works here: Magic Mouse Teardown. Jump down to Step9 where you can see the sensor array. Your trackpad is very similar.

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Check the ribbon cable 1st, then make sure the replacement logic board is the same model number. In some cases a logic board that is a different model will not be compatible with a track pad from a newer or older revision. The pic is of a Trackpad Ribbon cable 598-1604-B that was damaged from a spill.

Block Image

Block Image

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According to the numbers you provided the logic board is from a 2010 11" Macbook Air, and the track pad part number references a 2011 11" MacBook Air. I know for sure that the ribbon cable from the 2010 and 2011 are different. That could be the issue, part number for ribbon cable looks like this

[image|1021116]

Okay, it's starting to make more sense.

According to the Ifixit store, there are two different cables indeed: 922-9675 and 923-0011. My question is, are the different on both ends (the logic board end and the trackpad end)? Or would one of them allow me to use this 2010 board with that 2011 trackpad?

You would need one of the following combinations:

2010 MLB (Main Logic Board)

2010 TrackPad Keyboard Flex Cable

2010 TrackPad

Or

2011 MLB (Main Logic Board)

2011 TrackPad Keyboard Flex Cable

2011 TrackPad

So looks like you need to buy a 2010 TrackPad with the correct 2010 Flex cable

Thank you Greg.

The logic board that I have installed is 820-2796-A. The trackpad is 922-9971.

How do I find out if they are compatible or not?

I think you were right about the ribbon cable, some little part of the connector seems to have chipped off. I tried putting the original trackpad back, and I'm getting the exact same result as with the new one (click but no move). So I ordered a replacement cable, hopefully it will do the trick! Thanks again for your precious help.

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According to what I'm getting from the interwebs, you need to first shut off your computer. Then, locate the Command, Option, P, and R keys. Turn on your computer and press all of the 4 keys before the gray screen appears. Hold down the keys until your computer restarts. Then, navigate to your preferences and then to trackpad and ensure tap to click is enabled. (I'm not sure if this will work but hey, it's worth a shot isn't it?)

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