Service manual

Page 36 of 64
1) Image board(MGPC): Decode the video signal, De-interlace, and send digital signals (LVDS signal)
sent from image Board and display.
2) Audio board(AUPC): Audio signal AMP. and balance process.
3) Tuner board(TUPC): Input signal interface and tuner.
4) Key board(KEPC): POWER, INPUT source, MANUAL, Volume＋/－ and CH＋/－.
5) Power ON/OFF: AC power switch.
9-2 Image board block diagram and signal introduce/process
9-2-1 Input signal introduce
1. VIDEO: transmit bright & chroma signal , it is general ,its picture quality is equal to the general VCD.
S-VIDEO transmit the bright and the chroma single, and can reduce/control the cross-interfere , it is better
than the Video.
2. RGB&D-SUB(Pc interface ): general RGB simulative input interface .
3. YCbCr(NTSC/PAL): is composed of one bright and two chromatism signals U/V. due to the eye is more
sensitive for bright than chroma , RGB via the formulae Y=0.39R+0.50G+0.11B to transform into one bright
and two chromatism signals U(R-Y), V(B-Y).
4. VIDEO、S-VIDEO、YCBCR: the frequency 15.6KHZ 50(PAL)/60HZ(NTSC), interleaved simulative signal.
5. YPbPr: non-interlaced signal, belong to DTV scope, support 480P,720P,1080i format, current is NTSC.
6. DVI：digital Visual Interface, has 29pin（DVI-I）and 25pin (DVI-D), now many top grade display card own it.
9-2-2 Signal process
VIDEO signal : via Y/C separate, decode, de-interleaving to non-interlaced digital signal，and then sent it to
SCALER chip to process the image, then via the low voltage difference signal transform chip sent
to PANEL interface.
SCALER
PW181
DVI
YP
b
P
r
YCbC
r
D-SUB-15
RS232-9
RE
S
ET
Tuner 1
Com
p
osite 1
S-video 1
Com
p
osite 2
Tuner 2
S-video 2
PROMJET For 仿真
TELETXET
Switch
for AV
V-Decoder
VPC3230D
cc-vchip
Z86229
Deinterlace
PW1231A
V-Decoder
VPC3230D
cc-vchip
Z86229
74LV273
FLASH
AM29LV800
AMP 104549-8
LVDS
DS90C385
Sil164
TMDS Out
E2PROM
24LC32
Reset chip
TLC7733
P
A
N
E
L
ADC/AFE
MST9883B
ADC SW
PI5V330
TMDS RV
Sil161
RS232
MAX232A