Display Circuit Diagram - LG XA66 Service Manual

4. DISPLAY CIRCUIT DIAGRAM

12
CN301 CN301
TO SMPS TO SMPS
F-
1
F+
2
GND FB303 FB303 300RH 300RH
3
-24V FB304 FB304 300RH 300RH VEE
4
STBY FB305 FB305 300RH 300RH LED
5
11
VFDP FB306 FB306 300RH 300RH VPWR
6
CN302 CN302
To Main board To Main board
10 1 GND FB311 FB311 300RH 300RH FGND
1
LCD-CS FB312 FB312 0R 0R CCLK
2
2
3 LCD-DATA FB313 FB313 300RH 300RH CDAT
3
LCD-WR FB314 FB314 300RH 300RH CSTB
4
4
5 REMOTE-IN FB315 FB315 300RH 300RH REM
5
LED-POWER FB316 FB316 0R 0R LED
6
6
KEY1 FB317 FB317 300RH 300RH KEY-1
7
7
KEY0 FB318 FB318 300RH 300RH KEY-0
8
8
+3V3 FB320 FB320 300RH 300RH FT3V3
9
9
MAIN-POWER FB319 FB319 300RH 300RH VPWR
10
9 10
CT3V3
8
R307 R307 R308 R308
10K 10K 10K 10K
R314 R314
100R 100R
CSTB
DE301 DE301 C307 C307
7
KDS226 KDS226
101P 101P
R315 R315
FGND 100R 100R
CCLK FGND
DE302 DE302
6 KDS226 KDS226
C308 C308
101P 101P
R316 R316
FGND 100R 100R FGND
CDAT
C309 C309
5
101P 101P
DE303 DE303
KDS226 KDS226
FGND
FGND
4
CON6 CON6 Q332 Q332
3
To key board To key board 8550 8550
LED3V3
3 1
4
KEY-1
3
KEY-0
2
FGND
1 2
C304 C304
0.1uF 0.1uF
2
R344 R344
FGND 2K 2K
1
A B C D
VFD301 VFD301
HNA-15MM42T HNA-15MM42T
FGND
FGND
VEE
FT3V3
Q331 Q331
8550 8550 CT3V3
1 3
R320 R320 R319 R319
2
4.7K 4.7K 4.7K 4.7K
R318 R318
R322 R322 560R 560R
R309 R309 VPWR 2K 2K Q304 Q304
2
10K 10K 8050 8050
R321 R321
10K 10K
STB Q303 Q303
2
8050 8050
FGND FGND FGND
CLK
R323 R323
10K 10K
R304 R304 R303 R303
REM 100R 100R 10R 10R
DAT
C311 C311 C310 C310 C315 C315 C313 C313
0.1uF 0.1uF 0.1uF 0.1uF 100uF/10V 100uF/10V 100uF/10V 100uF/10V
IR301 IR301
REM REM
FGND FGND FGND
FGND R331 R331
910R 910R
FT3V3 CON8 CON8 SW301 SW301
To Front To Front Standby Standby
FGND
4
KEY-1
3
KEY-0
2
R375 R375 LED301 LED301 LED3V3
1
10K 10K Red Red C306 C306 FGND
0.1uF 0.1uF
R337 R337
R317 R317 910R 910R
FGND 330R 330R
R305 R305
1K 1K SW303 SW303
R306 R306 XDSS XDSS
2K 2K 2 Q301 Q301 LED302 LED302
Blue Blue
8050 8050
LED FGND
FGND
FGND
E F G H
1 FB301 FB301 300RH 300RH
F-
C301 C301
0.1uF 0.1uF
37
F+
R301 R301
2R7 2R7
FB302 FB302 300RH 300RH
C305 C305
0.1uF 0.1uF
C312 C312
0.1uF 0.1uF
FGND CT3V3
C303 C303
0.1uF 0.1uF
FGND
IC301 IC301
CLK G6
1 39
CLK GR6
DAT 2 38 G5
Din GR5
STB G4
3 37
STB GR4
DAT G3
4 36
Dout GR3
KEY-1 G2
5 35
K1 GR2
KEY-0 G1
6 34
K2 GR1
R802 82K R802 82K PT6324 PT6324
7 33
OSC S24
8 32
GND S23
CT3V3
9 31
VDD S22
P1
10 30
S1/KS1 S21
P2 P20
11 29
S2/KS2 S20
P3 P19
12 28
S3/KS3 S19
P4 P18
13 27
S4/KS4 S18
FT3V3
FT3V3
C302 C302
0.1uF 0.1uF
FGND FGND
Keyswitch PCB board
R332 R332 R333 R333 R334 R334 R335 R335 R336 R336
1.1K 1.1K 1.3K 1.3K 1.8K 1.8K 2K 2K 3K 3K
SW306 SW306 SW304 SW304 SW310 SW310 SW308 SW308 SW302 SW302 SW305 SW305
Function Function VOL+ VOL+ Open/close Open/close Backward Backward Play Play Forward Forward
FGND FGND FGND FGND FGND FGND
R338 R338 R339 R339 R310 R310 R311 R311 R312 R312
1.1K 1.1K 1.3K 1.3K 1.8K 1.8K 2K 2K 3K 3K
SW307 SW307 SW309 SW309 SW314 SW314 SW313 SW313 SW312 SW312 SW311 SW311
VOL- VOL- Stop Stop ST/Mono ST/Mono SET SET Time Time Clock Clock
FGND FGND FGND FGND FGND FGND
I J K L
3-31 3-32
F+
F-
-24V
F+ VFDP
STBY
LCD-WR
LCD-CS
LCD-DATA
LED-POWER
F- REMOTE-IN
KEY1
KEY0
MAIN-POWER
AUXL
AUXR
+3V3
Headerphone PCB board
PN703 PN703
1
1 PLIN R704 1K R704 1K H-L 2
1
AGND R703 1K R703 1K R705 4K7 R705 4K7
2 3
2
3 PRIN R701 1K R701 1K H-R H-R 4
3
PLOUT R702 1K R702 1K R706 4K7 R706 4K7
4 5
4
AGND PLIN
5 6
5
PROUT PLOUT
6 7
6
AGND
8
TO Amplifier PRIN
9
PROUT
10
AGND
11
PN602 PN602
To Main board To Main board R639 R639
1
AUXL FB501 FB501 300RH 300RH 39K 39K 2
3
PGND FB502 FB502 300RH 300RH
3
2
AUXR FB503 FB503 300RH 300RH R640 R640 4
1
39K 39K
5
C630 C630 C634 C634
R637 R637 R638 R638
100K 100K 100P 100P 100K 100K 100P 100P
PGND
USB5V
FGND FGND
DE306 DE306 DE305 DE305
KDS226 KDS226 KDS226 KDS226
U803 U803
CN604 CN604 USB5V
To Main board To Main board
5
GND
FB317 FB317 300RH 300RH 1
4 VDD
USBD+ FB325 FB325 300RH 300RH
2
3 HOST_D-
USBD- FB326 FB326 300RH 300RH
3
2 HOST_D+
GND FB316 FB316 300RH 300RH
4
1 GND
6
GND
C349 C349 C673 C673 C674 C674
C315 C315
USB USB
100uF/10V 100uF/10V 0.1uF 0.1uF 20pF 20pF 20pF 20pF
FGND
M N O P Q
F+ (2)
F- (2)
-24V (2)
VFDP (2)
STBY (2)
LCD-WR (4)
LCD-CS (4)
LCD-DATA (4)
LED-POWER (4)
REMOTE-IN (4)
KEY1 (4)
KEY0 (4)
MAIN-POWER(4)
AUXL (7)
AUXR (7)
+3V3
JK701 JK701
Headerphone Headerphone
1
2
3
4
5
6
7
8
9
10
11
JK601 JK601
AUX IN AUX IN
1
2
3
4
5
Display
2011. 01. 20
Rev 1.1
R S T