Here’s the install guide for the Smart A Backlight mod. It’s a bit short, but should clear up any questions you might have in regards to installation. So, in the same tradition as the other guides, what you’ll need is:

What you’ll need:
A Nintendo Wiimote
A Triwing Screwdriver
Smart A Mod (DIY or Prebuilt)
Soldering Iron and Solder
Circuit Tape (optional, included in prebuilt kit)

Step 1:
If you have circuit tape (included with the prebuilt kit), you’ll need to cut a strip of it to wrap around one of the solder pads. This step isn’t neccessary, but will make installation alot quicker. Since the solder pad for the push button is very low, the circuit tape will help to make the solder to connect easier.

Step 2:

Next wrap it around the pad as shown in the picture. Don’t worry if it doesn’t hold very well, you can solder it down permanently a few steps below.

Step 3:
Shown here are the points that you’ll want to line up the mod to solder to. The GND connection as shown can actually be any one of the four pins on that side of the IC, they’re all connected.

Step 4:
Here’s the mod soldered down. It’s probably best to solder the ground and input connections first, the +V connection is probably the hardest so you’ll want to have the mod as stable as possible when doing it. I’ve used a small wire (30ga) to bridge the gap between the pad and pin, to make things easier and neater for this guide.

Step 5:
And that’s pretty much it. If you want to check your installation, use a continuity tester on the points shown in the picture. If it tests okay, I would recommend testing the wiimote with batteries in before closing the housing.