XOCECO PH-42T8, Service Manual, Page: 15 / 77

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The arrangement diagram of the pins:
3.3 PW118
PW118 is the new high-powered image manipulation chip of Pixelworks. The 24 bit digital RGB
signal and the related sync signal outputted by AD9398 and PW2300 shall be inputted to this chip to
make the image manipulation, and are outputted LVDS signal to drive the screen directly. In
addition to the function of interlaced to line-by-line, this chip further include the function of image
enhancement, etc. This chip is the main CPU of this set. It take charge of all control except for the
power supply control, including the control of each chip operation in the main board (eg. the image
manipulation, the channel switch, the image display, etc.), the control of the button, remote device
and sound, etc., and the assistant CPU N401 ATMEGA8L control mainly the power supply,
including the stand-by and the control button of remote device to turn on the set, etc. The menu
interface also generate by PW118. The external memory of PW118 N402 AT24LC32A stores the
related data. The Flash chip N404 MX29LV800 store the related procedure, the chip DDRSDRAM
(N501 K4D553238F-JC) assists the operation of PW118 as the external memory.