Prima PS-42T8 Service Manual page 11

3. IC function, the internal block diagram, the pin introduction
3.1 PW2300
PW2300 is a piece of the front-end video-processing chip that integrates a high-powered,
multi-system video decoder with a high speech ADC module. All of the input video signal (except for
HDMI signal) are inputted to this chip to the AD switch and video decoding, 24 bit digital RGB signal
and the related sync signal are outputted to N602 PW118 to make the processing. PW2300
complete mainly the functions of 3D comb filter, the channel switch, 5-line Y/C separation, the color
decoding and so on. It connect external SDRAM chip N703 HY57V161610E treated as the internal
memory to assist the operation of PW2300.
PW2300 internal block diagram:
PW2300 the arrangement diagram of the pins:
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