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Logitech Mouse Led Modification

Thursday, January 09, 2003 by TheDoc


It seem like almost everyone's got at least one of Logitech's ever popular basic optical mouse. These mice have been proven time after time to be a great bang-for-the-buck. They also look surprisingly nice too, but now I'm going to show you a little trick to spice up that mouse of yours. We will be changing the standard, now boring red Led to a nice shinny blue one, but of course, you can use any color you desire. I'm sure you've seen people do it before, but now you can too!

Materials Required

  • Logitech Mouse
  • 3.7V, 20mA, >= 2600mcd brightness Led color of your choice (blue used here)
  • Philips head screw driver
  • Soldering Iron
  • Solder (any kind should do)

A steady hand and soldering experience would definitely help, but are not required as this is some very basic solder work that we will be performing today. As a note, those of you who are thinking that this might work on your MS intelliMouse, it won't as I've already tried and it appears that the intelliMouse uses a different voltage Led. Just for the record, Led is pronounced L-E-D (not "lead"), and it stands for Light Emitting Diode. You can pick up all of these parts, save the mouse, at your local electronics store such as Radio Shack.

Lets get started...

Here's what the mouse will look like right when you pull it out of the box and plug it in. It certainly does look nice, but we can make it better.

If you turn over the mouse, you will notice that there is only one screw holding the little bugger together. Simply take your screw driver, unscrew it, and wiggle the top casing off. It may seem like it's stuck on there, but it's not, just wiggle it around and pull towards the back of the mouse and it should come off with no problems. After removing the top proceed to take out the circuit board. Once out, remove the scroll wheel by simply pulling up on it and sliding it right out. Make sure that you DO NOT loose that little spring that comes out with it! You will also see and horizontal metal brace holding down the Led plastic mount. Just bend out the sides of it slightly to remove it.

After removing the small metal brace, take that plastic piece that it was holding down (this is the Led mount) and bend it upward just a bit, this will make it easier to remove the Led. Now, turn over the circuit board and look near the very top right under the start of the Led mount where the Led wires feed into the board. There are two solder points which you will need to re-melt with your soldering iron and pop out the Led wires by pulling on the mount while the solder is molten. It shouldn't take more than a few tries before you can wiggle it out. Make sure your iron is good and hot so you can melt the points without leaving the iron on them for too long, which could melt/damage the PCB. The picture at the right shows the Led successfully removed.

Installing the blue LED

Now that you have successfully removed the red Led, remove the actual red Led from the plastic Led mount, and replace it with the new blue one. Take note!! One of the legs on the blue led is longer than the other one. The longer leg denotes that this is the positive (+) terminal!

Once you have inserted the blue led into the plastic mount, place both legs back in their respective holes on the PCB. Make sure that the long leg (positive end) goes in the first hole, which has a + sign right next to it, as you will see in the first picture. Now get the mount into the position you first found it in, and put the small metal brace over it to hold it down. On to the soldering...

Turn over the PCB to the back and place a nice little droplet of solder where each pin makes contact with the board. Make sure the two solder points do not touch each other, as this could cause a short! If you are a notoriously bad with a soldering iron (like me) then make sure if you don't get it the first time, to take the iron off the board and try again in a few seconds after it's cooled. Make sure not to leave the soldering iron on the PCB for too long, otherwise you may risk burning or melting it, just like I did (it still works, though you shouldn't push your luck).

After soldering and everything else, place the PCB back into the bottom casing. Do it gently, because you don't want to break off the fresh solder points. Don't forget to put the scroll wheel back in along with the accompanying spring. Simply slide it back on to the vertical pieces of plastic and that's it! Now plug in your mouse to check if it is working, if it is, great! If not, you may have burnt the PCB, in which case you will need to make your solder "blobs" bigger to touch the trace that leads up to them. Now route the cord back to the front and replace the cover and screw! When replacing the cover, be sure to slide it in from the back, as there are small notches on the front that need to fit together for the mouse to function.

All Done!

This is how it should look when it's all done! Is that better than the red light or what?! You may also choose to put more leds (same or different colors) inside the mouse by soldering the legs to those of the new blue one. It would give for a nice lighting effect, and some originality ;) Have fun and feel free to add your own twists to this mod.

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