Tearing Down SoftBank's Handset w/ Touch Sensor

Apr 22, 2008
Nikkei Electronics Teardown Squad

This time, the Nikkei Electronics Teardown Squad will tackle SoftBank Mobile Corp's handset, the FULLFACE2 SoftBank 921SH.

The handset is manufactured by Sharp Corp. It is positioned as the successor of FULLFACE SoftBank 913SH released in July 2007. The main feature of the 921SH is that it can be operated by touching the screen, tracing on the screen with a finger or shaking the main unit. Although it also employed a touch sensor, its predecessor could not be operated by tracing on the screen with a fingertip.

The purpose of our teardown is to determine the differences and similarities between the former and latest models. We discovered that the latest model uses a number of parts that are the same as those in the former model, except for the sensor. In particular, the LSI mounted on the main board has the same components used not only in the 913SH, but also in the 920SH, which is also manufactured by Sharp and sold by SoftBank.

The following pages describe the structures of the touch sensor, the main board and the chassis. The investigation was conducted with the cooperation of Fomalhaut Techno Solutions, as with the disassembly operation of another mobile phones featuring improved camera functionality (See related article).

Product nameFULLFACE 2 SoftBank 921SH
MakerSharp
DimensionAbout 112 × 50 × 15.9mm (excluding protruding portions)
MassAbout 135g
Standby timeAbout 330 hours
Talk timeAbout 240 minutes
DisplayAbout 3.2 inches (480 × 854 pixels)
Memory cardmicroSD memory card, microSDHC memory card)
Camera3.2 million effective pixels (main), 0.11 effective pixels (sub)
Battery3.7V, 790mAh

(Continue to the next page)

1
2
3
4
5