LG LST-4200A Service Manual - Page 48

Whole Block Diagram - 3

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3. WHOLE BLOCK DIAGRAM - 3 RF IN : Video Signal : Audio Signal ATSC NIM TUNER : Digital Video Signal : Digital Audio Signal IC500 Loop Through Tuner 5V I2C 3V I2C IC106 EEPROM (32Kx8b) NTSC AUDIO NTSC VIDEO Sil 170 5V I2C I2C Hub IC102 DVI 5V I2C I2C IC200, IC201 SDRAM (2Mx32bx2) CPU CLK 10 MHz X-tal X100 RS-232C RS232 Driver (MAX232) IC105 Sys Reset (KIA7029 & 74HC14) IC100, IC101 UART IC110 IC103, IC104 Flash ROM (512Kx16bx2) CPU (S3C44B0X) 60MHz Mute Control Buffer (74LCX157) IC208 IC107, IC108 SDRAM (4Mx16bx2) CPU I/F Front Panel VFD Controller VFD IR Receiver Key Scan Key Block NTSC VIDEO IC301 VIDEO PIXEL DECORDER (VPX3226E) YCbCr AC220V SMPS Power Control +30V +12V +9V +5V +5V_Alive +3.3V -28V -24V -21.5V +5V_Alive +3.3V +3.3V_Alive 3.3V Regulator IC501 2.5V Regulator IC503 1.8V Regulator IC502 +1.8V +2.5V_Alive ATSC TP Digital Audio Out IC200 NTSC AUDIO DATA DAC (CS4340) 2CH L/R Audio Out IC400 LPF (MC33078) IC402 5V I2C Digital RGB Hs, Vs 3V I2C IC302 TMDS CH0,1,2 DVI Transmitter TMDS CLK +(Sil170) TP Demux Video Decoder Audio Decoder Format Converter VDP (LGDT1102A : HD-II) Line Driver (74HC540) IC202 FL300~302 LPF (TOKO 25M) X 3 IC303 AMP (LMH6683) Hs/Vs RGB Digital Audio Coaxial Out Digital Audio Optical Out I2C Ext. (82B715) IC300 Variable Audio Out X2 DVI Out RGB RGB Video Out YPbPr Video Out VCR out (Comp.) VCR out (Y/C) IC304 AMP (LMH6683) Main PWM Main VDP Clock NT2CLK SYSCLK IC204 VCXO IC (CY24212) Clock Gen. (CY24206) IC206 27 MHz X-tal X200 VCR Out S-Video Out 3-41 3-42

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3-41
3-42
3. WHOLE BLOCK DIAGRAM - 3
RF IN
Loop
Through
Tuner
5V I2C
ATSC NIM TUNER
CPU
(S3C44B0X)
60MHz
SDRAM
(4Mx16bx2)
Flash ROM
(512Kx16bx2)
EEPROM
(3
2Kx8b)
CPU I/F
3V I2C
CPU CLK
RS232
Driver
(M
AX232)
UART
Sys Reset
(KIA7029 &
74HC14)
RS-232C
10 MHz
X-
tal
YPbPr Vi
deo Out
AMP
(LMH6683)
Line Driver
(74HC540
)
RGB
Hs/V
s
RGB Video Out
TP Demux
Video Decoder
Audio Decoder
Format Converter
VDP
(LGDT1102A
: HD-II)
LPF
(TOKO 25M)
X 3
Main PW
M
Main VDP Clock
Clock Gen.
(CY24206
)
NT2CL
K
SYSCLK
DVI
Transmitter
(Sil17
0)
TMDS CH0,1,
2
TMDS CLK +-
I2C Ext.
(82B715
)
5V I2C
DVI Ou
t
Digital RGB
Hs, V
s
3V I2C
SDRAM
(2Mx32bx2)
ATSC TP
Digital
Audio Out
2CH L/R
Audio
Out
LPF
(MC33078)
Digital Audio
Optical Out
DAC
(CS43
40)
Digital Audio
Coaxial Out
AC
220V
+30V
+12V
+9V
+5V
+5V_Alive
+3.3V
-28V
-24V
-
21.5V
SMPS
Power Contro
l
Variable
Audio Out X2
I2C Hub
I2C
I2C
5V I2C
VCR Ou
t
S-Video Out
VCR out (Comp.)
VCR out (Y/C
)
AMP
(LMH66
83)
RGB
DVI 5V
I2C
Sil
170
+5V_Aliv
e
3.3V
Regulato
r
+3.3V_Alive
2.5V
Regulato
r
+2.5V_Aliv
e
+3.3
V
1.8V
Regul
ator
+1.8
V
VFD
Controller
Front Panel
VFD
Key Scan
Key Bl
ock
IR
Receive
r
VCXO IC
(CY24212
)
IC500
IC106
IC102
IC100, IC101
IC105
IC110
IC103, IC104
IC107, IC108
IC501
IC503
IC502
IC400
IC402
X100
X200
27 MHz
X-tal
IC200
IC200, IC201
IC302
IC300
IC202
Buffer
(74LCX157
)
Mute Contro
l
IC208
IC204
IC206
IC303
IC304
FL300~30
2
: Video Signal
: Audio Signal
: Digital Video Signal
: Digital Audio Signa
l
NTSC AUDIO
NTSC VIDEO
VIDEO PIXEL
DECORDER
(VPX3226E)
IC301
NTSC VIDEO
YCbC
r
NTSC
AUDIO
DA
TA