47LT777H (CHASSIS:LA2FZ) - LG TV Service Manual (repair manual). Page 45

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THERMAL
T
H
E
R
M
A
L
THE    SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE    SYMBOL MARK OF THE SCHEMETIC.
@partN
@refer
@compC
@suppr
13/08/07
EAX64677902.cir/086.sht
@area
C8607
47uF
10V
C8603
10uF
25V
C8600
2.2uF
10V
IC8600
SC632ULTRT
3
C1-
2
C1+
4
IN
1
GND
5
EN
6
OUT
7
C2+
8
C2-
9
[EP]GND
C8601
2.2uF
10V
C8606
47uF
10V
+3.5V_ST
+5V_ST
R8644
0
PTC_TX_MTK
UART3_RX
C8632
0.1uF
SOC_RX
8:AK23
RS232_RX38:X21
R8622
47K
+3.5V_ST
+3.5V_ST
/UPDATE_BY_CPU
PTC_RX_MTK_3.3V
R8646
47K
C8633
0.1uF
+3.5V_ST
+3.5V_ST
UPDATE_SW
87:L19
R8637
10K
RESET_HIGH
87:M27
PTC_RX_5V
87:X7
IC8604
MC14053BDR2G
3
Z1
2
Y0
4
Z
1
Y1
6
INH
5
Z0
7
VEE
8
VSS
9
C
10
B
11
A
12
X0
13
X1
14
X
15
Y
16
VDD
Q8603
2SC3875S(ALY)
E
B
C
R8641
10K
+3.5V_ST
R8645
0
IC8605
MC14053BDR2G
3
Z1
2
Y0
4
Z
1
Y1
6
INH
5
Z0
7
VEE
8
VSS
9
C
10
B
11
A
12
X0
13
X1
14
X
15
Y
16
VDD
R8621
10K
RS232_TX38:X21
UART_SWA
87:AA21
UART3_TX
S27;87:N15;87:Y26;
87:AA4
R8627
0
PTC_TX
87:X7
UART3_RX
Y25;87:N15;87:Y26;
87:AA4
UART3_TX
S21;87:N15;87:Y26;
87:AA4
UART_SWB
87:AA21
SOC_TX
8:AK24
R8638
10K
Q8602
2SC3875S(ALY)
E
B
C
R8643
10K
R8626
100
R8629
100
R8630
100
R8628
100
R8634
100
R8633
100
R8632
100
R8635
100
R8631
100
R8636
100
R8639
1K
R8640
1K
RESET_BY_CPU
C8639
10uF
25V
C8602
0.1uF
16V
OPT
R8663
18K
1%
D8600
40V
SMAB34
R8660
0
R8662
56K
1%
R8661
100K
1%
+3.5V_ST
+12V_ST
C8640
1uF
10V
MPI_PWR_ON/OFF
L8600
3.6uH
C8655
22uF
16V
C8644
1uF
16V
OPT
IC8602
TPS61087DRC 
3
EN
2
FB
4
AGND
1
COMP
5
PGND
6
SW_1
7
SW_2
8
IN
9
FREQ
10
SS
11
[EP]AGND
C8617
10uF
10V
C8641
0.1uF
16V
R8664
75K
C8643
100pF
50V
OPT
C8642
1200pF
50V
EXT_AMP_L_IN
C8609
0.1uF
C8608
22uF
16V
R8611
1K
+5V_SUB_AMP
Q8601
MMBT3904(NXP)
E
B
C
IC8601
TPA6011A4PWPRG4
3
PVDD_1
2
ROUT-
4
RHPIN
1
PGND_1
6
RIN
5
RLINEIN
7
VDD
8
LIN
9
LLINEIN
10
LHPIN
11
PVDD_2
12
LOUT-
13
PGND_2
14
LOUT+
15
SHUTDOWN
16
FADE
17
BYPASS
18
AGND
19
SEMAX
20
SEDIFF
21
VOLUME
22
HP/LINE
23
SE/BTL
24
ROUT+
+5V_SUB_AMP
C8612
1uF
25V
L8605
BLM18PG121SN1D
EXT_AMP_R_IN
+5V_SUB_AMP
R8609
100
OPT
EXT_SPK_R-
R8608
4.7K
R8601
1K
R8603
1K
R8602
100
+5V_NORMAL
R8605
3.3K
R8610
100
EXT_SPK_L-
EXT_SPK_R+
C8611
1uF
10V
C8610
1uF
10V
EXT_SPK_L+
R8606
10K
R8604
0
EXT_SPK_MUTE
R8607
100
R8615
1K
+3.5V_ST
EXT_SPK_L+
EXT_SPK_L-
EXT_SPK_R-
C8614
39pF
OPT
L8602
C8613
39pF
OPT
R8617
470K
OPT
JK8600
PEJ029-02
3
E_SPRING
6
T_TERMINAL
7
B_TERMINAL
5
T_SPRING
4
R_SPRING
8
G_SPRING
EXT_SPK_R+
TP8604
C8615
39pF
OPT
L8604
R8618
470K
OPT
R8619
470K
OPT
TP8603
R8620
470K
OPT
TP8602
TP8601
L8603
C8616
39pF
OPT
L8601
R8665
0
R8667
470K
OPT
C8660
6800pF
OPT
R8671
470K
OPT
C8661
33pF
+12V
IC8606
AZ4580MTR-E1 
3
IN1+
2
IN1-
4
VEE
1
OUT1
5
IN2+
6
IN2-
7
OUT2
8
VCC
C8662
0.1uF
50V
R8670
2.2K
EXT_SPK_ROUT_MAIN
C8657
6800pF
OPT
EXT_AMP_R_IN
R8666
2.2K
R8673
10K
L8606
120-ohm
C8658
33pF
R8668
33K
EXT_SPK_LOUT_MAIN
R8672
33K
EXT_AMP_L_IN
R8669
10K
+3.3V_NORMAL
EXT_SPK_DET
4.7uF
C8664
10V
C8665
0.47uF
OPT
R8613
1K
R8612
15K
IC8607
74LVC1G126
OPT
3
GND
2
A
4
Y
1
OE
5
VCC
+3.3V_NORMAL
R8675
10K
OPT
R8676
100
R8674
10K
R8677
0
* 3.5V_ST -> 5V_ST Step-up Power 
Serial for Commercial
SELECT PTC OAD OR NOT
SELECT PTC OR BCM DEBUG
1
COM/MON
1
BCM DEBUG
PTC DEBUG
SIMULATION
SW_B
Objective
X
1
0
SW_A
PTC USB
0
X
X
1
X
2011.02.09
xxLT760H-UA
86
Commercial Power
R2
R1
* 3.5V_ST -> 12V_ST Step-up Power 
EXT_SPK AMP
400mA
EXT_SPK OUT
EXT_SPK OP AMP
EXT_SPK_DET
Connected
Disconnected
Low
High
Y
QE
A
Input
H
L
Output
H
L
H
X
L
H
Z
X = don’t care
Z = high-impedance OFF-state
74LVC1G126
Display
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