This time, the game of the Nikkei Electronics Teardown Squad is Willcom Inc's Willcom D4, which is more of an ultrasmall Windows PC with a built-in PHS function than a mobile phone.

When we actually used it, we could see that Willcom gave priority to computer functions instead of communication capabilities. Probably, that is why the internal structure of the D4 resembles that of a PC.

The handset was developed by Sharp Corp. But the company seemingly outsourced its production to Quanta Computer Inc of Taiwan, which probably was deeply engaged in designing the hardware. The D4 differs greatly from other Sharp's handsets, such as the Internet Machine SoftBank 922SH and the Fullface2 SoftBank 921SH, for example, in the choice of components.

The existing products of Sharp are normally equipped with a self-manufactured 1seg tuner, but, in the D4, a 1seg tuner made by another maker is used. In addition, parts made by Taiwanese manufacturers are used everywhere.

On the whole, the D4 uses a large number of components, including many screws with different shapes. When we found a jumper wire on the board, we had the impression that the handset was designed in a short period of time.

The boards and other internal structures will be detailed in the following pages. Like our operations in the past, the disassembly was carried out with the cooperation of Fomalhaut Techno Solutions.マウス・ボタンタッチ・センサキーパッドの回路部分メイン基板と放熱機構

Click each part to show a larger picture or more detailed information

ManufacturerSharp Corp
DimensionsApprox 188 x 84 x 25.9mm (including a dedicated battery, measured when closed, excluding projections)
WeightApprox 460g (including a dedicated battery)
Battery lifeApprox 1.5 hours (standard battery pack used, measured based on the JEITA Battery Run Time Measurement Method ver. 1.0)
Display5.0-inch (1024 x 600)
Memory cardmicroSD memory card
CameraEffective pixel count: 19.8 Mpixels (autofocus)
Battery7.4V, 960mAh