Continued from [PS4 Teardown (4)] Simply-designede Main Board
Electronic components were mounted on both sides of the main board. Especially, a large number of components were located on the side on which the main processor was mounted. The relatively large (probably the second largest) semiconductor chip mounted near the center of the board (Fig. 1) seemed to be the "secondary custom chip."
The secondary custom chip handles network processing such as downloading contents from the Internet when the PS4 is in a standby state. Because the main processor is not used, the secondary custom chip can reduce power consumption. On the surface of the chip, characters such as "SCEI" and "CXD90025G" were printed. It measured 17 x 17mm.
Below the secondary custom chip, there was another relatively large chip measureing about 14 x 14mm. And a wireless LAN/Bluetooth module was located to the upper right of the secondary custom chip. In two areas near the module (near the edge of the main board), there were patterns that seemed to be antennas. Considering that an antenna for Bluetooth uses a sheet metal, we thought that those patterns were used for wireless LAN.
In addition, there were several ports on the upper side of the main board (Fig. 1) and parts constituting the power supply circuit on the lower side.
We continued to tear down the PS4 by removing the metal parts on the lower side of the main board. Under those parts, there was a cooling fan. There was a variation in pitch between fins, making areas with short pitches and areas with long pitches. By taking out the fan, we wrapped up the teardown of the PS4.