I opened up the left side of my TS. No control circuitry, per se. There's a hole for the USB cable (on the top edge, a little left of center), but nothing for it to connect to.
On the bottom of the surface your fingers touch is an array of chips, eight from top to bottom and probably six from left to right.
The board is actually a sandwich of two boards; the top is the sensor surface, the bottom is about one-third as wide, and accommodates the ribbon cable attachment. How the two boards connect is not apparent, as it can't be seen without detaching one form another, which I haven't and won't do.
My hope was that mass production would have meant that the firmware and the USB mounting circuitry was duplicated on the left board; it's apparently not.
Pictures forthcoming, and even sooner if people donate to the cost of my getting a new TS.
