LG 32LT640E-TA (CHASSIS:LB2AF) Service Manual ▷ View online
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.
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.
1uF
25V
25V
EXT_SPK
C1709
+5V_SUB_AMP
EXT_SPK_DET
EXT_SPK_R-
EXT_SPK_R+
TPA6011A4PWPRG4
EXT_SPK
IC1700
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+
39pF
OPT
OPT
C1704
1uF
10V
EXT_SPK
C1703
EXT_SPK_L-
100
EXT_SPK
R1719
EXT_SPK_L+
1K
EXT_SPK
R1700
+5V_SUB_AMP
1K
EXT_SPK
R1714
10K
EXT_SPK
R1715
4.7K
EXT_SPK
R1718
+5V_Normal
39pF
OPT
OPT
C1707
100
OPT
R1716
R1716
EXT_AMP_R_IN
+3.3V_Normal
1K
EXT_SPK
R1713
EXT_SPK_L-
39pF
OPT
OPT
C1706
EXT_AMP_L_IN
1K
EXT_SPK
R1701
EXT_SPK
L1703
51K
OPT
R1702
22uF
16V
16V
EXT_SPK
C1700
1uF
10V
EXT_SPK
C1702
BLM18PG121SN1D
EXT_SPK
L1704
EXT_SPK_L+
+3.5V_ST
EXT_SPK
L1702
+5V_SUB_AMP
100
EXT_SPK
R1705
EXT_SPK_R-
3.3K
EXT_SPK
R1712
100
EXT_SPK
R1711
39pF
OPT
OPT
C1708
P E J 0 2 9 - 0 2
EXT_SPK
JK1700
3
E_SPRING
6
T_TERMINAL
7
B_TERMINAL
5
T_SPRING
4
R_SPRING
8
G_SPRING
EXT_SPK
L1701
0
EXT_SPK
R1708
0 . 1 u F
EXT_SPK
C1701
EXT_SPK
L1700
EXT_SPK_R+
100
EXT_SPK
R1717
SUB_AMP_MUTE
NEC_DBG_TX
+3.5V_ST
0
R1707
DBG_RX
100
R1721
0 . 1 u F
C1711
3.6K
R1709
UART_DBG_SW
+3.5V_ST
0 . 1 u F
C1705
MST_DBG_TX
0
R1725
3.6K
R1710
0
R1706
100
R1704
MST_DBG_RX
DBG_SW
DBG_RX
NEC_DBG_RX
DBG_TX
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1702
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
DBG_TX
+3.5V_ST
EXT_VOL-
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1705
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1701
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
EXT_VOL+
+3.5V_ST
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1706
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
+3.5V_ST
4.7K
R1724
0
OPT
R1723
0 . 1 u F
C1712
UART_RX
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1703
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
100
R1727
I2C_SDA
MST_DBG_TX
I2C_SCL
UART_SW1
NEC_RX
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1710
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
+3.5V_ST
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1709
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
0
OPT
R1729
MST_NEC_TX
UART_SW2
1uF
50V
50V
C1714
NEC_EEPROM_SCL
22
R1731
100
R1728
0
OPT
R1722
100
R1720
NEC_EEPROM_SDA
EEPROM_SW
+3.5V_ST
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1704
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
UART_RX
UART_TX
+3.5V_ST
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1708
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
NEC_TX
MST_TX
0
OPT
R1730
MST_RX
MST_DBG_RX
UART_TX
0 . 1 u F
C1710
EEPROM_SDA
ON SEMICONDUCTOR
NLASB3157DFT2G
EAN38256201
ANALOG SWITCH
IC1707
3
B0
2
GND
4
A
1
B1
6
SELECT
5
VCC
100
R1726
MST_NEC_RX
0 . 1 u F
C1713
EEPROM_SCL
P E J 0 2 7 - 0 4
JK1701
6B T_TERMINAL2
7B B_TERMINAL2
5 T_SPRING
4 R_SPRING
7A B_TERMINAL1
6A T_TERMINAL1
3 E_SPRING
MMBT3904(NXP)
EXT_SPK
Q1700
E
B
C
4.7K
EXT_SPK
R1703
400mA
CONNECTION
UART/I2C SWITCH
L
H
EXT_SPK_CONTROL/DEBUG
EXT_SPK AMP
EXT_SPK OUT
A - B 0
H
CONNECTION
L
UART_SW1
A - B 1
L
H
CONNECTION
MSTAR DEBUG
MSTAR ADJ
UART_SW2
A - B 0
A - B 1
INTERACTIVE
NEC USB_DOWNLOAD
UART_SW
A - B 0
A - B 1
NEC DEBUG
MSTAR DEBUG
A - B 0
A - B 1
DEBUG_NEC/MSTAR
H
DBG_SW
L
EXT_SPK CONTROL
CONNECTION
A - B 0
A - B 1
NEC-EEPROM
H
EEPROM_SW
L
MSTAR-EEPROM
CONNECTION
EMEA INTERACTIVE
GP4_MSTAR
2 0 1 1 . 0 8 . 2 1
EXT SPK
1 7 2 0
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.
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.
M41T83RMY6F
IC1801
3
NF_2
2
NF_1
4
NC_2
1
NC_1
6
DU
5
RST
7
SQW
8
VBAT
9
VSS
10
SDA
11
SCL
12
IRQ1/FT/OUT
13
NC_3
14
IRQ2
15
VCC
16
NF_3
17
NV_4
18
NC_4
CLOCK_SDA
BATTERY
BA1800
1
2
+3.5V_ST
+3.5V_ST
33
R1807
1K
R1801
+3.5V_ST
22uF
16V
16V
OPT
C1811
CLOCK_SCL
33
R1808
10K
OPT
R1814
EXT_5V
0 . 1 u F
50V
POWER_OUT
C1807
150K
POWER_OUT
R1802
1/16W
270K
1%
POWER_OUT
R1816
3 . 3 u F
50V
50V
POWER_OUT
C1810
1/8W
200K
1%
POWER_OUT
R1809
EXT_12V
22uF
25V
25V
POWER_OUT
C1806
1/16W
20K
1%
POWER_OUT
R1815
MBRA340T3G
POWER_OUT
D1800
+24V
22
POWER_OUT
R1810
100K
POWER_OUT
R1804
0 . 1 u F
50V
50V
POWER_OUT
C1812
22UH
POWER_OUT
L1802
+12V
1/16W
10K
1%
POWER_OUT
R1817
THERMAL
MP4460DQ-LF-Z
POWER_OUT
IC1802
3
EN
2
SW_2
4
COMP
1
SW_1
5
FB
6
GND
7
FREQ
8
VIN_1
9
VIN_2
10
BST
11
EP_GND
0 . 1 u F
50V
POWER_OUT
C1803
18K
POWER_OUT
R1800
2.4K
POWER_OUT
R1821
200
POWER_OUT
R1822
100K
POWER_OUT
R1823
0 . 1 u F
16V
16V
OPT
C1815
100
POWER_OUT
R1806
1/16W
1.2K
POWER_OUT
R1819
EXT_PWR_DET
CB3216PA501E
POWER_OUT
L1800
43
POWER_OUT
R1820
+12V
EXT_12V
0 . 1 u F
50V
50V
POWER_OUT
C1817
EXT12V_CTRL
MP5000DQ
POWER_OUT
IC1803
3
ENABLE/FAULT
2
DV/DT
4
I-LIMIT
1
GND
5
NC
6
SOURCE_1
7
SOURCE_2
8
SOURCE_3
9
SOURCE_4
10
SOURCE_5
11
VCC
1K
POWER_OUT
R1818
CB3216PA501E
POWER_OUT
L1804
THERMAL
TPS54327DDAR
IC1800
POWER_OUT
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
0 . 1 u F
50V
POWER_OUT
C1805
12K
1%
POWER_OUT
R1805
BLM18PG121SN1D
POWER_OUT
L1803
22uF
16V
16V
POWER_OUT
C1808
56K
1%
POWER_OUT
R1811
3300pF
50V
50V
POWER_OUT
C1801
NR8040T3R6N
3.6uH
POWER_OUT
L1801
11K
1%
POWER_OUT
R1812
1uF
10V
10V
POWER_OUT
C1800
10K
POWER_OUT
R1813
22uF
16V
16V
POWER_OUT
C1804
100pF
POWER_OUT
C1814
+12V
EXT5V_CTRL
EXT_5V
10uF
25V
25V
C1816
POWER_OUT
150pF
50V
50V
POWER_OUT
C1802
0 . 1 u F
16V
16V
C1809
470pF
50V
50V
POWER_OUT
C1813
D1801
A2
C
A1
APX803D29
POWER_OUT
IC1804
1
GND
3
VCC
2
RESET
REAL TIME CLOCK(RTC)
c l o s e t o p i n
S w i t c h i n g n o i s e r e d u c i n g [ M P S r e c o m m e n d ]
EXTERNAL_POWER DETECTION
EXTERNAL_POWER OUT 5V/12V
$ 0 . 2 1
EMEA INTERACTIVE
GP4_MSTAR
2 0 1 1 . 0 8 . 2 1
EXT_POWER
1 9 2 0
Vout=(1+R1/R2)*0.765=5.03V
c l o s e I C 1 8 0 0
Contents of LCD TV Standard Repair Process
No.
Error symptom (High category)
Error symptom (Mid category)
Page
Remarks
1
A. Video error
No video/Normal audio
1
2
No video/No audio
2
3
Video error, video lag/stop
3
4
Color error
4
5
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
5
6
B. Power error
No power
6
7
Off when on, off while viewing, power auto
on/off
on/off
7
8
C. Audio error
No audio/Normal video
8
9
Wrecked audio/discontinuation/noise
9
10
D. Function error
No response in remote controller, key error,
recording error, memory error
recording error, memory error
10
11
External device recognition error
11
12
E. Noise
Circuit noise, mechanical noise
12
13
F. Exterior error
Exterior defect
13
1. Trouble Shooting
Click on the first or last page to see other 32LT640E-TA (CHASSIS:LB2AF) service manuals if exist.