Introduction

A common problem with the mighty mice is that dirt gets in the scrollball assembly and will make scrolling extremely aggravating. There are other solutions like washing the ball in rubbing alcohol and using that to clean the rollers, but I found it much more effective to attack the problem at the source. I would assume that this guide would loosely work for the USB version though I have not tried.

Image 1/1: Before disassembling the mouse, first try scrubbing the mouse ball with a toothbrush and isopropyl alcohol. Be sure to get the bristles between the ball and the housing as this will help remove dirt and dust that is clogging the rollers inside.
  • Before you continue, turn off the mouse using the slide switch underneath the mouse.

  • Before disassembling the mouse, first try scrubbing the mouse ball with a toothbrush and isopropyl alcohol. Be sure to get the bristles between the ball and the housing as this will help remove dirt and dust that is clogging the rollers inside.

  • You can also try blowing into the "ball hole" with a can of compressed air.

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Image 1/3: Remove the bottom panel by pushing the release latch down and to the left. Image 2/3: You may need to pry the edge of the bottom panel up in the indicated area. Image 3/3: Remove the batteries.
  • Begin by flipping the mouse over, as shown.

  • Remove the bottom panel by pushing the release latch down and to the left.

  • You may need to pry the edge of the bottom panel up in the indicated area.

  • Remove the batteries.

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Image 1/2: Twist the spudger to separate the ring from the body of the mouse.  Work the spudger around the whole mouse until the ring is completely detached. Image 2/2: You must use some force to break the adhesive that holds the ring in place, but try not to crack the plastic ring.
  • Insert spudger between button and outer white ring.

  • Twist the spudger to separate the ring from the body of the mouse. Work the spudger around the whole mouse until the ring is completely detached.

  • You must use some force to break the adhesive that holds the ring in place, but try not to crack the plastic ring.

  • You will have to glue this ring back to the mouse body when reassembling it. Cyanoacrylate adhesive works well.

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Image 1/1: Similarly, use the spudger to unhook two pivot points.
  • Undo two clips using a spudger.

  • Similarly, use the spudger to unhook two pivot points.

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Image 1/1:
  • Carefully separate the two halves; do not pull on the flex cables.

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Image 1/2: Disconnect both flex cables. Image 2/2: The second photo shows how far to pull the latches.
  • Gently unlock the latches with a fingernail or a spudger. Do not stress the latch, or it might break.

  • Disconnect both flex cables.

  • The second photo shows how far to pull the latches.

  • When reassembling the mouse, both cables should be inserted into the connectors contact-side-up.

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Image 1/2: Image 2/2:
  • Remove three Phillips #00 screws that attach the scrollball assembly to the upper shell.

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Image 1/1: There are small loose parts in the Assembly, be careful when removing the cover. The small magnetic wheels are especially easy to lose.
  • Pry the white ball cover out of the black housing with a small flat-head screwdriver.

  • There are small loose parts in the Assembly, be careful when removing the cover. The small magnetic wheels are especially easy to lose.

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Image 1/1: Clean all parts in isopropyl alcohol, allow them to dry, and reassemble the device.
  • Remove the four rollers from the black housing with tweezers. They are held in place magnetically.

  • Clean all parts in isopropyl alcohol, allow them to dry, and reassemble the device.

  • When reassembling the Assembly, the Rollers are placed back with the back wheel end touching the metal tabs.

Abou 2 years ago I have followed these instructions to clean my mouse and everything was perfect. But now I tried this procedure again, but the mouse ball isn't working anymore. I thought I had the flat cables in the wrong position, and then I checked it, and I think they are in the correct position. The photos are small and I cannot be sure the position of the flat cables are correct. I would like to know how can I check this. What is the correct side to insert these flat cables? I'm sure I close the ball box correctly and it's running smooth inside it.

sergio barrozo - Reply

Conclusion

To reassemble your device, follow these instructions in reverse order.

93 other people completed this guide.

Alex Jansen

Member since: 04/21/2010

7,723 Reputation

2 Guides authored

25 Comments

Confirmed: these instructions work just fine for the usb version. The ribbon cable connectors are positioned slightly differently, but otherwise, exactly the same process. My usb mighty mouse is now like brand new. Thanks.

manwithfire - Reply

Very good guide, worked very well for USB version as well, cable connector sitting in different positions but it's not a problem. Fixed my mouse in about 15 minutes, I would say it was easy.

Thanks!

Tobias - Reply

thanks, it worked perfectly.

olivierfrein - Reply

Great guide. I followed it and re-assembled my wireless mighty mouse, only problem though, now the ball only scrolls up. When I scroll up, down, left, or right, the page scrolls upwards in all cases. Any tips?

Omar ElHagin - Reply

I guess I screwed it. Something went wrong with one of the flex cables, so that the scrollball works fine, but the pointer doesn't move any more. F**k.

lomez - Reply

Great guide! My usb mighty mouse is now clean and 100% functional! At first, i was a little scared about step 3 (i thought i could break it) but everything went ok. All i needed was Just a little patience. This plastic piece turned out to be of much more quality and rigidity than i expected!

Thanks a lot to the member who made this guide! You've saved me $49! =)

Fokka85 - Reply

Excellent instructions: clear explanations and photographs. My mouse, despite Apple's faulty design, is now working as it should. BTW, it's a USB mouse and the instructions work just fine.

I added an additional step for my USB mouse: after disconnecting the flex cables in Step 6, it was no trouble to carefully remove the circuit board in order to get at the accumulated dust and gunk that had collected underneath.

Peri - Reply

take a clean piece of paper, or a pad of paper, and turn the mouse with the trackball down. apply the slightest pressure, and draw figure 8's or the infinity sign for 30seconds.. repeat with another piece of paper.

turn over and use scrollball again.

pritishjacob - Reply

This trick is so easy! Thank you for the idea!

Bekah -

This method works for me, no need to take anything apart.

Tim Meehan -

You can do the same thing with a non-linty cloth dampened with high-test isopropyl. It'll work great the first couple of times, and you may get most of a year more out of it, but eventually you WILL need to disassemble the mouse to remove the crud.

The roller shafts should be brushed lengthwise with a soft toothbrush dipped in isopropyl; this is where the crud settles that disables the ball motion.

macsrwe -

Excellent guide, thank you. This was a pretty simple operation. I skipped the step of disconnecting the cables as I didn't want to risk breaking a connector on my 8 year old MM. It was a bit awkward at times but I was careful and it worked out fine. Like a new mouse!

Dan O'Connor - Reply

Just dug up the mouse to replace the broken one temporarily, and found the ball not working in two out of four directions.

When I disassembled the whole thing, each wad of dirt was nearly as big as the black magnetic wheels inside the assembly. Ended up just soaking them in a small vial of alcohol. Works perfectly.

And after all these years and all that dirt, I only just realised that the "click" sounds of the scrollball is actually generated by the buzzer inside the mouse. I feel deceived in a weird way. At least iPod clickwheels were stationary (except the very first one, I guess).

Jaewoo Chung - Reply

Mine has a little piece broken inside the tracking ball system (the white square), avoiding to track up movement. I've been looking for a replacement, with no luck. help?

Frozen Sea - Reply

Great - thanks OP for publishing. I have a USB A1152 Mouse - followed this - I'm back in business! Works 100%, great response from the mouse scrollball now... ;]

BobaFettuccine - Reply

Great phank you so much it worked great with the USB. It helped a lot!! Just with the alcohol and the tootbrhuch

buda9 - Reply

My 15 years old wireless mighty mice is still the mighty! gr8! :)

Done some clean up and fix the loosen flex cable.

sahaini - Reply

It works perfect now! Many thanks for the detailed descrbtion for de- and reassembling!

adi - Reply

10 second fix with the toothbrush. I used nail polish remover as we had this at home. 10/10 to ifixit, 0/10 to Apple for designing a mouse that gets dirty inside so quickly (compared with other mice), and is so hard to disassemble when needed (compared with other mice).

pduncanj - Reply

Hi there,

Excellent tutorial thanks for posting it. Does anyone know where I could buy a replacement scroll ball? My kids tried to "fix" it with sand paper... all scratched now and very jumpy.

Thanks!

Matteo Petitti - Reply

has anyone changed the shell of the mouse to a clear and black "2000: Apple Pro Mouse (Model M5769)" ?

Francisco Javier Perez - Reply

Perfect, thank you. I used your guide for a USB version and it was very similar. Works like new!

Thomas Resimont - Reply

Try this first - it may save you the hassle:

Turn the mouse upside down and, while pushing down, run the mouse on its scroll ball over a mouse mat. You are vigorously exercising the ball.

Voila - works for me!

Note: I see this technique has been posted above also; never mind - this tip is probably useful enough to bear repeating :)

Wytze Hoekstra - Reply

I fall in love with iFixIt.. I had repaired my macbook always with help you and this time mouse scroll button is working charm… I never gone to any service centre for any types of repair.. hats off!! keep it up!!

Naurej Alam - Reply

I've never taken anything apart to fix it before, but this tutorial worked great! I also didn't totally unplug everything, which made it a little awkward but it still worked. I didn't soak anything in alcohol either, I just wiped all the grime off and put it back together and it's working great! Thanks for the help.

Lisa Humason - Reply

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