Apple Magic Trackpad teardown

With the iPhone's release, Apple introduced the masses to Multi-Touch (using multiple-finger gestures to navigate the device's UI). In 2008, they brought Multi-Touch to laptops with the launch of the Macbook Air and updates to the MacBook Pro. In 2010, Apple is trying to bring Multi-Touch to the desktop, with the Magic Trackpad.
Come along as Bill Detwiler cracks open the Apple Magic Trackpad in this teardown gallery.
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Released in July 2010, the Apple Magic Trackpad costs $69 (US). It requires a Bluetooth-enabled Mac running OS X Snow Leopard v10.6.4. You may also need to download and install the Magic Trackpad drivers from Apple before using the Trackpad.
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Apple's Multi-Touch technology lets you use multiple-finger gestures to manipulate your computer's GUI. Many of these motions are printed on the back of the Magic Trackpad box.
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Opening the box reveals the Magic Trackpad.
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Other than the Magic Trackpad itself, the box contains only the product documentation.
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According to Apple, the Magic Trackpad is 5.17 inches long, 5.12 inches wide, and 0.18 to 0.72 inches tall (because of the angled touch surface). The pointing devices weighs 4.94 ounces without batteries.
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Along the Magic Trackpad's left side, you find the battery compartment cap.
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Along the Magic Trackpad's right side, you find the power button.
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On the bottom of the Magic Trackpad, you find two elongated rubber feet on the battery compartment, a white plastic panel, and two circular rubber feet on the white panel. These circular feet actually help translate pressing down on the Trackpad into a mouse click.
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Using a large Phillips screwdriver or plastic spludger (as shown in this photo), unscrew the battery compartment cap.
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The Magic Trackpad requires two AA batteries to run, and Apple provides them with the device. Those who really want to go green can replace the standard batteries with rechargeable ones. Apple will even sell you a battery charged and six AA NiMH batteries for $29 (US).
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Our first step in cracking open the Magic Trackpad is removing the white plastic panel from the bottom of the device. Using a thin metal or plastic spludger or iPod/iPhone case opening tool, you should be able to pry loose the panel's bottom edge. The panel has four tabs that slide into slots on the Magic Trackpad's metal frame. Gently work your way around the bottom edge, releasing all the tabs and prying the white panel away from the metal frame.
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The white panel is help in place by the four tabs and clear adhesive. The adhesive holds the panel to a plastic, white support structure within the Magic Trackpad.
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With the bottom panel removed, we get our first look inside the Apple Magic Trackpad. We can see the main logic board, white plastic support structure, "mouse-click" hinge plate, and the underside of the touch surface.
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Looking at the internal side of the Trackpas's bottom panel, we can see the four tabs and two circular rubber feet. Unfortunately, I broke two of the tabs when removing the panel.
As the panel is primarily help on with adhesive, it might actually have been better to pry the panel loose from the other end. Pulling it free from the frame and then sliding the tabs out of their corresponding slots.
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The circular rubber feet on the back of the Magic Trackpad serve two purposes--holding the pointing device in one spot and translating the physical motion of pressing down on the device into a mouse click.
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The circular rubber feet have hard centers that push up when you push down from the top of the Trackpad.
A small bit of adhesive cushion also remains in the center of the panel. This helps protect one of the main chips.
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With the bottom panel removed, we can see the main components with in the Apple Magic Trackpad. There is a white, plastic support structure that fills the void inside the device, the main logic board, a metal "mouse-click" hinge plate, and the underside of the touch surface.
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Our next step is disassembling the Magic Trackpad, is removing the "mouse-click" hinge plate. Along with the circular rubber feet (discussed previously), this hinge plate translated the physical motion of pressing down on the Trackpad into a mouse click. While this is an interesting may to generate a mouse click, it unfortunately means the device must be used on a hard surface unless you enable the tap-to-click option under the device's software settings.
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There are six, very small Phillips 00 screws that hold the hinge plate to the metal frame.
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Thin metal hinges hold the plate to the metal frame.
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A total of 12 Phillips screws and two hinges hold the plate to the frame.
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There is another screw at the top of the Magic Trackpad near the battery compartment. This screws doesn't seem to hold anything in place, but appears to a grounding screw for the touch surface.
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The main logic board reveals chips from Broadcom, SST, and Texas Instruments.
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The large chip is the Broadcom BCM2042, which provides not only Bluetooth connectivity but also serves as the processors with built-in RAM/ROM memory.
Below and to the right of the large Broadcom chip is the SST25WF020, which provides 2Mbit of serial flash memory.
Above and to the right of the large chip is the Broadcom BCM5974 touchscreen controller. This is the same chip found in other Apple devices that support Multi-Touch, like the MacBook Pro.
Above the large Broadcom chip is a Texas Instruments chip with markings CD3238 TI 01J P20T.
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There are two ribbon cable connectors for the Multi-Touch surface on the main logic board.
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Extremely thin wiring for the touch surface is located along the bottom of the Magic Trackpad.
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More wiring from the touch surface is located under the white support structure along the side.
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There are four wires soldered to the main logic board for the battery and LED connections.
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The picture shows the Magic Trackpad's power button, the internal support structure, and thin metal tab held in place by the screw we removed from the top of the Magic Trackpad.
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Looking at the device from the side, you can see the Magic Trackpad's Multi-Touch surface--the darker gray layer onto of the shinny aluminum frame. This surface is help onto the frame with adhesive. To remove the surface, I would need to heat the adhesive. As this would likely damage the device beyond repair, I'm going to leave the surface in place.
Besides, there's nothing really to see on the underside of the surface other than adhesive. You can see much of the touch surface's underside through the internal support structure.
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The Apple Magic Trackpad is definitely a unique touch interface device. It's somewhere between a Wacom tablet and a mouse.
Unfortunately, there's not much inside the user-serviceable. Other than replacing the batteries, the device shouldn't require much, if any, routine maintenance.
Photo credit: Bill Detwiler / TechRepublic