Key Circuit Diagram - LG DP372B Service Manual

8. KEY CIRCUIT DIAGRAM

5VD
C1 C1
10uF/16V 10uF/16V
R3 R3
10K 10K R4 R4 U1 U1
30K 30K NJM3414AM NJM3414AM
C4 C4 10uF/16V 10uF/16V R5 R5 1 8
A OUT V+
VCOMO 10K 10K
2 7
A- IN B OUT
3 6
A+ IN B- IN
4 5
GND B+ IN
R7 R7
R6 R6 10K 10K
20K 20K
-10V
C8 C8
4.7uF/25V 4.7uF/25V
89P VCOM DAC OUTPUT
CN2 CN2
1 LCD_3.3V
LCD_3.3V
2
3 GND
5VA
4
5 89L_R
89L_G
6
89L_B
22 7
GND
8
CPH1
21 9
STHL
10
STVL
11
CKV
12
OEV
13
OEH
14
VCOMO
15
16 GND
SP_R-
17
18 SP_R+
SP_L-
19
20 SP_L+
CON20_0.8MM CON20_0.8MM
+7.5V
R18 R18
20K 20K
CN3 CN3
1 IR
KEY_PLAY
2
3 DVD_KEY1
DVD_KEY2 R20 R20
10 4
9 5 DVD_KEY3 10K 10K
DVD_KEY4
6
DVD_KEY5
7
GND
8
L5 L5 4.7uH 4.7uH
CON8_0.8MM CON8_0.8MM
C34 C34
104 104
TP1 TP1 TP8 TP8
SP_L+ SP_L+
SP_L- SP_L-
TP2 TP2 TP7 TP7
TP3 TP3 TP9 TP9
SP_R+ SP_R+
SP_R- SP_R-
TP4 TP4 TP10 TP10
IR1 IR1
HRM538CB5100 DIP HRM538CB5100 DIP
5VA
TP5 TP5
R36 R36
IR G VCC IR G VCC R40 R40
4.7K 4.7K 100 100
IR TP6 TP6
C43 C43 C44 C44 C46 C46
20pF 20pF
10uF/16V 10uF/16V
104 104
1 2 3
1.Ref
2.Anode
3.Cathode
LGE Internal Use Only
VR2 VR2
10K 10K
1 3 R2 R2 2K 2K
R1 R1
6.8K 6.8K
C5 C5 10uF/16V 10uF/16V
VCOM
D1 D1
D_15V D_15V
1 2 +15V
C6 C6 4.7u/25uF 4.7u/25uF
R8 R8
TBD/10K TBD/10K
C9 C9 105 105
C10 C10
2
104 104
D4 D4
3
C13 C13 C14 C14
2 2
1
104 104 104 104
C15 C15
104 104
BAT54S BAT54S
D6 D6
L3 L3 0R 0R L2 L2 6.8uH 6.8uH
LCD_3.3V
1 2
C16 C16 C20 C20
104 104 + + 1N5819 1N5819
47uF/10V 47uF/10V
R14 R14
10K 10K
BIAS
C27 C27 C29 C29 C28 C28 C30 C30
104 104 104 104 104 104 22uF/10V 22uF/10V
C36 C36 R19 R19
7VD5 (NC)104 (NC)104 51K 51K
C35 C35
10uF/16V 10uF/16V
R24 R24
10K 10K
K3 PLAUSE K3 PLAUSE
DVD_KEY1
1 2
5VD 5VD
K4 NEXT K4 NEXT K5 PRE K5 PRE
R31 R31 R33 R33
DVD_KEY2 1 2 1 2
NC NC 0R 0R
UND
K2 STOP K2 STOP
DVD_KEY3 1 2 R32 R32 R34 R34
0R 0R NC NC
K1 PLAY K1 PLAY
KEY_PLAY
1 2
5VD
L1 L1 4.7uH 4.7uH
C2 C2
10uF/16V 10uF/16V
VCOM
D2 D2
D_10V D_10V
-10V 1 2
C7 C7 4.7u/25uF 4.7u/25uF
R9 R9
330 330
R10 R10 0 0
D3 D3 R11 R11 0 0
1 C11 C11 105 105 R35 R35 NC NC
3 C12 C12 105 105
BAT54S BAT54S
D5 D5
R44 R44 NC NC
1
3
BAT54S BAT54S
U2 U2
78L05 78L05
+7.5V 5VD
3 1
IN OUT
C17 C17 C21 C21 C22 C22 C23 C23
105 105 C19 C19
22uF/16V 22uF/16V 22uF/16V 22uF/16V 104 104 C18 C18
104 104 22uF/16V 22uF/16V
L4 L4
C25 C25
89L_R R_IN
1.8uH 1.8uH
R23 R23 C32 C32 C33 C33
R_IN
105 105
U3 U3 160 160 100pF 100pF 100pF 100pF
MP1540 MP1540 RCR2561
DC TO DC
4 3
EN FB
L6 L6
89L_G G_IN
1.8uH 1.8uH
R30 R30 C40 C40 C41 C41
160 160 100pF 100pF 100pF 100pF G_IN
LNR
L7 L7
89L_B B_IN
1.8uH 1.8uH
R43 R43 C48 C48 C49 C49
160 160 100pF 100pF 100pF 100pF
B_IN
3-41 3-42
LCD_3.3V
C3 C3
104 104
AVSS 26
1
2 AVDD 25
BOUT VB
3 24
GOUT VG 23
4
ROUT VR
5 22
GND 21
6
7 VCC 20
CPH1 CPH1 19
8
9 CPH2 18
CPH3 17
10
STHR
11 STHR 16
STHL STHL 15
12
OEH 13 28 OEH 14
MOD 13
14 27
LNR 15 L/R 12
VCOM 11
16
17 VCOM 10
OEV OEV 9
18
UND 19 U/D 8
CKV CKV 7
20
STVL 21 STVL 6
STVR STVR 5
22
23 VGH 4
VGL 3
24
25 VCC 2
GND 1
26
Spec Sheet No.
CON26_0.5MM CON26_0.5MM
CN1 CN1
AUO A070FW03
InnoLux AT070TN04
CPT CLAA070WA03
PVI PW070XU3
Elite Star LR070WA01B
7VD5 BIAS
R15 R15 R16 R16 R17 R17
39k 39k 430/270 430/270 47K 47K
C24 C24 105 105
Vdc ROUT
C26 C26 10uF/16V 10uF/16V C C
B B
1
Q1 Q1
E E SMBT3904 SMBT3904
R21 R21 R22 R22 C31 C31
10K 10K
100/75 100/75 100pF 100pF
7VD5 BIAS
R25 R25 R26 R26 R27 R27
39K 39K 430/270 430/270 47K 47K
C37 C37 105 105
Vdc GOUT
C38 C38 10uF/16V 10uF/16V C C
B B
1
Q2 Q2
E E SMBT3904 SMBT3904
R28 R28 R29 R29 C39 C39
10K 10K
100/75 100/75 100pF 100pF
7VD5 BIAS
R37 R37 R38 R38 R39 R39
39k 39k 430/270 430/270 47K 47K
C42 C42 105 105
Vdc BOUT
C45 C45 10uF/16V 10uF/16V C C
B B
1
Q3 Q3
E E SMBT3904 SMBT3904
R41 R41 R42 R42 C47 C47
10K 10K
100/75 100/75 100pF 100pF
Copyright © 2008 LG Electronics. Inc. All right reserved.
Monday, October 15, 2007 Monday, October 15, 2007 Monday, October 15, 2007
Only for training and service purposes