IC26 TPU3050, which is a teletext processor, is used as an RGB switch and
teletext processor along with IC27 GM76C8128, which is a memory IC. TPU3050
switches RGB signals from scart and output of teletext information.
Sound signals can be from IF box as sound IF and audio L, R signals from
scarts and audio sockets for pc and s-video inputs.
Sound processing is achieved by IC24 MSP3410D. It is driven by the xtal X4
18.432Mhz. Output of MSP3410D, which is audio L,R, is fed into IC13 TDA7262
for amplification of 2x15 watts on 4 ohm speakers.
MSP3410D also outputs 2 line out audio signals via PR14B on analog board.
DIGITAL BOARD 11DG42Y
Digital 8-bit YUV signals in 4:2:2 format are fed into GMVLX1A, IC14 if the path
is normal or IC1 if it is pip path.
GMVLX1A is used for de-interlacing, image scaling and gamma correction along
with KM4132G512A SGRAM, IC15 if the path is normal or IC2 if it is pip path.
Output of GMVLX1A is RGB each of 8-bit.
PC signal, which consists of analog RGB, horizantal and vertical syncronization
signals are fed into digital board via J2 DB15. Analog RGB signals are fed into
IC11 TDA8752, which is an analog to digital converter, in order to be converted
into digital 8-bit RGB.
According to the input mode selected, through buffer memories IC9, IC10 for PC
RGB and IC16, IC17 for normal video path, PC or normal video RGB and
syncronization signals are fed into IC18 GMFRC1A, which is a frame rate
conversion chip. PIP 8-bit RGB signal is fed into IC3 GMFRC1A for frame rate
conversion.
GMFRC1A manages frame rate conversion along with SDRAMs MT48LC1M16A
IC19, 20, 21 if the path is normal or IC4, 5, 6 if it is pip path.
After frame rate conversion process in GMFRC1As, video signals are fed into
IC22 EPF10K30AQC, which is a 30K size PLD (Programmable Logic Device).
This pld is used for digital board management and some special dsp applications
on video signal such as rounding, error diffusion. After PLD, video signal; RGB
each 8-bit with syncronization signals are ready to be sent to Plasma display
panel via Nec interface board.
