[Breaking Down Latest Mobiles] ICs on Both Surfaces of Mainboard [Hitachi: Part 2]

Dec 25, 2007
Nikkei Electronics Breakdown Team

The mainboard in the W53H (the Wooo phone) was about the same size as a Li-ion secondary battery. Both surfaces of the board were entirely covered with a number of ICs and modules.

The mainboard of the W53H was about the same size as a Li-ion secondary battery. The sub-board and the camera module were also found on the mainboard. The Li-ion secondary battery had a rated voltage of 3.7V and a capacity of 850mAh.

With the sub-board removed. Slots for SD and SIM cards, the LED camera flash unit for shooting in the dark and other components were also mounted on the board.

Mainboard (front side: the surface connected to the sub-board): A built-in 1seg antenna and a 1seg tuner module (the gold part in the center) were provided on the board. The 1seg tuner module was marked with an "M" symbol with a shape different from the one on the P905i. It was probably manufactured by Murata Manufacturing Co Ltd. Yamaha Corp's audio control IC, YMU794, was also mounted on the mainboard.

The built-in 1seg reception antenna was firmly bonded to the mainboard by resin. Judging by its shape, it was likely a tunable antenna from Murata.

Mainboard (back side): As with the mainboard of the P905i, it was covered with electromagnetic shielding.

After taking off the shield, the Nikkei Electronics Breakdown Team found an LSI bearing a sticker that was presumably intended for the protection against electromagnetic noise. When we removed the sticker, Qualcomm Inc's application processor MSM6550 was exposed.

A flash memory and power-related components manufactured by Samsung Electronics Co Ltd of Korea were provided on the surface on which Qualcomm's MSM6550 chipset for mobile phones was mounted.