LG LST-3100A Service Manual page 44

3. OVERALL BLOCK DIAGRAM 3
: Video Signal
: Audio Signal
ATSC NIM TUNER
RF IN
Loop
Through
RS-232C
AC120V
SMPS
: Digital Video Signal
: Digital Audio Signal
IC203
Tuner
IC105
EEPROM
(32Kx8b)
5V I2C 3V I2C
5V I2C
Sil 170
DVI 5V I2C
I2C Hub
IC108
I2C I2C
CPU CLK
IC109
10 MHz
IC100, IC101
X-tal
Flash ROM
X101
(512Kx16bx2)
UART
RS232
CPU
Driver
(S3C44B0X)
(MAX232)
60MHz
IC102
Mute Control
Sys Reset
(KIA7029 &
74HC14)
IC103, IC104
Front Panel
Controller
IR
Receiver
Power Control
+30V
+12V
+9V
+5V
+3.3V_Alive
+5V_Alive
+3.3V
3.3V
+5V_Alive
-28V
Regulator
-24V
IC111
-21.5V
1.8V
+3.3V
Regulator
IC114
ATSC TP
IC200
IC201, IC202
SDRAM
(2Mx32bx2)
IC106, IC107
SDRAM
(4Mx16bx2)
CPU I/F
TP Demux
Buffer Video Decoder
(74LCX157) Audio Decoder
IC2300 Format Converter
VDP
(LGDT1102A
: HD-II)
VFD
VFD
Key Scan
Key Block
2.5V
+2.5V_Alive
Regulator
IC113
+1.8V
3-38 3-39
Digital
Audio Out
2CH L/R
Audio Out
DAC LPF
(CS4340) (MC33078)
IC110 IC112
5V I2C
I2C Ext.
(82B715)
IC207
Digital RGB
Hs, Vs
IC206
TMDS CH0,1,2
DVI
Transmitter
TMDS CLK +-
(Sil170)
3V I2C
Hs/Vs RGB
Line Driver
(74HC540)
IC205
RGB
FL300~302
IC302
LPF
AMP
(TOKO 25M)
(LMH6683)
X 3
IC303
VCR out (Comp.)
AMP
VCR out (Y/C)
(LMH6683)
IC3300
VCXO IC
Main PWM
(CY24212)
27 MHz
Main VDP Clock
X-tal
Clock Gen.
NT2CLK
X3300
(CY24206)
SYSCLK
IC300
Digital Audio
Coaxial Out
Digital Audio
Optical Out
Variable
Audio Out X2
DVI Out
RGB Video Out
YPbPr Video Out
VCR Out
S-Video Out