LG 37LT640H-ZA (CHASSIS:LD2AF) 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.
+3.5V_ST
0 . 1 u F
C451
OPT
100K
R404
PD_+24V
10K
R430
OPT
0 . 1 u F
16V
C404
+12V/+15V
NR8040T3R6N
3.6uH
L415
AO3407A
Q409
G
D
S
PWM_DIM
1/16W
56K
1%
R441
22uF
10V
C456
+3.5V_ST
560pF
50V
50V
C467
10K
OPT
OPT
R427
+12V/+15V
1.5K
1%
R403
PD_+24V
THERMAL
TPS54319TRE
IC403
1
VIN_1
3
GND_1
7
COMP
9
SS/TR
10
PH_1
11
PH_2
12
PH_3
13
BOOT
14
PWRGD
15
EN
16
VIN_3
5
AGND
8
RT/CLK
6
VSENSE
4
GND_2
2
VIN_2
17
EP[GND]
1K
R419
0 . 1 u F
16V
16V
C440
+3.3V_Normal
100pF
C489
+3.3V_Normal
L413
10K
R443
10K
R421
0 . 1 u F
C474
L401
0 . 1 u F
16V
C407
OPT
22uF
10V
C453
0
OPT
R476
2.2K
R407
OPT
3300pF
50V
50V
C493
10uF
25V
25V
C405
56K
1%
R416
10uF
10V
10V
C403
5.6K
R440
22uF
10V
C472
4.7K
R486
OPT
+24V
+1.5V_DDR
POWER_DET
0
POWER_16_GND
R412
+5V_Normal
47K
R429
L412
+3.5V_ST
10K
R410
SMAW200-H24S2
SLIM_32~52
P401
19
12V
14
GND
9
3.5V
4
24V
18
INV ON
13
GND
8
GND
3
24V
17
12V
12
3.5V
7
GND
2
24V
16
GND/V-sync
11
3.5V
6
GND
1
PWR ON
20
A.DIM
15
GND
10
3.5V
5
GND
21
12V
22
P.DIM1
23
GND/P.DIM2
24
Err OUT
25
1/16W 330K 5%
R432
INV_CTL
0 . 1 u F
16V
16V
C438
0 . 1 u F
16V
16V
C411
100
R415
0 . 1 u F
16V
16V
C406
0 . 1 u F
16V
OPT
16V
OPT
C445
0 . 1 u F
16V
16V
C425
4 . 7 u F
16V
16V
C423
FET_AOS
PANEL_CTL
1:AK10
THERMAL
AP7173-SPG-13 HF(DIODES)
IC407
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[ E P ]
0
OPT
R475
A_DIM
+3.5V_ST
+1.10V_VDDC
22uF
16V
16V
C420
100
R420
ERROR_OUT
2.2K
R405
OPT
10uF
25V
C443
100
R480
PD_+24V
0
R471
1K
R414-*1
PWM_PULL-DOWN_1K
+12V/+15V
10uF
16V
OPT
16V
OPT
C442
10K
R462
NR8040T3R6N
3.6uH
L406
+5V_USB
22uF
16V
16V
C492
OPT
+3.3V_Normal
68uF
35V
C426
OPT
0 . 1 u F
16V
16V
C432
10K
R463
OPT
0 . 1 u F
16V
C416
OPT
0 . 1 u F
16V
16V
C444
0 . 1 u F
16V
16V
C435
0 . 1 u F
16V
C447
1uF
10V
10V
C494
100K
R488
10K
R401
0 . 1 u F
16V
C476
0 . 1 u F
16V
16V
C431
0 . 1 u F
16V
16V
C455
10uF
10V
10V
C430
+3.3V_Normal
33K
R439
1/10W
1.21K
1%
R447
PD_+12V
RL_ON
1
R473
FM20020-24
P404
NORMAL_32
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
25
3K
R405-*1
PANEL_DISCHARGE_RES
0 . 1 u F
16V
16V
C408
OPT
0 . 1 u F
16V
16V
C412
PD_+24V
10K
OPT
R446
22K
R435
PANEL_VCC
8.2K
1%
R482
PD_+24V
0 . 1 u F
50V
C418
3K
PANEL_DISCHARGE_RES
R407-*1
100pF
50V
C439
+3.5V_ST
0 . 1 u F
16V
C475
+3.5V_ST
10K
R426
100
R402
10K
R433
+2.5V_Normal
+3.3V_Normal
10K
R428
22K
R438
FW20020-24S
P403
NORMAL_EXPEPT_32
19
14
9
4
18
13
8
3
17
12
7
2
16
11
6
1
20
15
10
5
21
22
23
24
BLM18PG121SN1D
L420
+3.3V_Normal
+3.5V_ST
22K
R431
10uF
10V
C461
ERROR_OUT
10K
R461
OPT
+3.5V_ST
+12V/+15V
11K
1%
R411
BLM18PG121SN1D
L403
BLM18PG121SN1D
L425
6.8K
OPT
R418
+3.5V_ST
0 . 1 u F
16V
C441
2.7K
1%
PD_+12V
R448
+24V
10K
R434
POWER_ON/OFF_1
0
5%
PD_+3.5V
R450
4.7K
R406
12K
1%
R423
15K
R436
1/16W
27K
1%
R442
1/16W
4.3K
1%
R457
1/16W
4.7K
1%
R456
T J 3 9 4 0 S - 2 . 5 V - 3 L
IC402
1
GND
2
VOUT
3
VIN
0 . 1 u F
50V
C413
0
R413
0
R400
OPT
FB_CORE
THERMAL
TPS54327DDAR
IC401
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
10K
R489
OPT
10K
R490
OPT
100uF
16V
C401
OPT
100uF
16V
C402
OPT
0 . 0 1 u F
50V
C436
0 . 0 1 u F
3300pF
50V
C448
3300pF
C488
CIS21J121
L404
BEAD_SS
CIS21J121
L402
BEAD_SS
CIS21J121
L407
BEAD_SS
MMBT3904(NXP)
Q405
E
B
C
MMBT3904(NXP)
Q400
E
B
C
MMBT3904(NXP)
Q406
E
B
C
MMBT3904(NXP)
Q407
E
B
C
MMBT3904(NXP)
Q401
E
B
C
AO3407A
Q403
FET_AOS
G
D
S
3.9K
R414
PWM_PULL-DOWN_3.9K
MMBT3906(NXP)
Q402
1
2
3
0 . 0 1 5 u F
50V
50V
C409
0 . 0 1 5 u F
APX803D29
IC408
PWR_DET_ON_SEMI
1
GND
3
VCC
2
RESET
APX803D29
IC409
PD_+24V_PWR_DET_ON_SEMI
1
GND
3
VCC
2
RESET
12507WR-08L
FOR LPB MODEL
P405
1
2
3
4
5
6
7
8
9
33
FOR LPB MODEL
R408
33
FOR LPB MODEL
R409
EEPROM_SCL
EEPROM_SDA
100
R445
FET_AOS
+3.3V_Normal
MLB-201209-0120P-N2
BEAD_MAG
L407-*1
MLB-201209-0120P-N2
BEAD_MAG
L404-*1
MLB-201209-0120P-N2
BEAD_MAG
L402-*1
AO3435
FET_2.5V_AOS
Q403-*2
G
D
S
DMP2130L
FET_2.5V_DIODE
Q403-*1
G
D
S
APX803D29
PD_+24V_PWR_DET_DIODES
I C 4 0 9 - * 1
1
GND
3
VCC
2
RESET
APX803D29
PWR_DET_ON_DIODES
I C 4 0 8 - * 1
1
GND
3
VCC
2
RESET
33K
OPT
R417
2.2K
FET_2.5V
R445-*1
2 . 2 u F
10V
10V
FET_2.5V
C423-*1
OLP
22uF
10V
10V
C437
POWER_LARGE
4A
R2
New item
Max 1000mA
V o u t = 0 . 8 * ( 1 + R 1 / R 2 ) = 1 . 5 3 1 9
+1.5V_DDR
$ 0 . 1 6 5
Vd=550mV
1 2 V - - > 3 . 5 8 V - - > 3 . 8 2 V ( 3 . 6 8 V )
+3.3V_Normal
FROM LIPS & POWER B/D
R1
780 mA
PANEL_POWER
Vout=(1+R1/R2)*0.765=5.03V
R1
2000 mA
1.5A
S 7 L R c o r e 1 . 2 V v o l t
R2
300 mA
Vout=0.827*(1+R1/R2)=1.225V
2 4 V - - > 3 . 7 8 V - - > 3 . 9 2 V ( 3 . 7 9 V )
S T _ 3 . 5 V - - > 3 . 3 7 5 V - - > 3 . 4 6 V
+2.5V/+1.8V
Power_DET
+5V_USB
R1
3A
R2
2 0 V - - > 3 . 5 1 V - - > 3 . 7 6 V ( 3 . 5 9 V )
2 0 1 1 . 0 8 . 2 1
4 2 0
EMEA INTERACTIVE
GP4_MSTAR
FOR LPB Download
[To LED DRIVER]
’ E R R O R _ O U T ’ i s u s e d f o r
lamp(CCFL/EEFL) models.
I n o t h e r w o r d s ,
L E D m o d e l s n e e d n o t u s e .
N o t u s e d :
o n l y f o r s m a l l ( r e a d y )
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.
390pF
50V
C533
10K
R521
33pF
50V
50V
C509
1000pF
50V
C505
1000pF
50V
C516
SPK_L-
SPK_R-
12
R512
0 . 1 u F
50V
50V
C520
4.7K
R517
1uF
25V
25V
C529
10.0uH
L506
0 . 1 u F
50V
50V
C519
0 . 1 u F
50V
50V
C521
10.0uH
L504
0 . 1 u F
50V
C537
12
R514
0 . 1 u F
50V
C539
0 . 1 u F
50V
C502
SPK_R+
AUD_LRCK
10uF
10V
10V
C515
AUD_LRCH
0 . 4 7 u F
50V
C535
SPK_R+
100
R506
10uF
10V
C510
10.0uH
L505
+3.3V_Normal
0 . 1 u F
50V
50V
C522
SPK_L-
10uF
10V
OPT
C511
10uF
35V
C524
0 . 1 u F
16V
16V
C512
0 . 1 u F
16V
16V
C508
10.0uH
L503
+24V_AMP
0 . 1 u F
16V
C514
12
R508
AMP_MUTE
12
R510
390pF
50V
C530
22000pF
50V
50V
C527
10uF
35V
35V
C523
SPK_R-
AUD_SCK
SPK_L+
0 . 1 u F
50V
50V
C540
AMP_RESET
4.7K
R519
1uF
25V
25V
C528
3.3K
R505
0 . 1 u F
50V
C538
AUD_MASTER_CLK
22000pF
50V
C517
10uF
10V
10V
C506
WAFER-ANGLE
P501
1
2
3
4
AMP_SDA
0 . 1 u F
50V
C501
+24V
1N4148W
100V
OPT
D504
1N4148W
100V
OPT
D502
22000pF
50V
C518
BLM18PG121SN1D
L502
390pF
50V
C531
0 . 1 u F
16V
C513
12
R511
AMP_SCL
390pF
50V
C532
0 . 0 1 u F
50V
50V
OPT
C525
12
R509
SPK_L+
100
R503
+24V_AMP
22000pF
50V
C526
+3.5V_ST
1N4148W
100V
OPT
D503
4.7K
R516
+24V_AMP
1uF
25V
25V
C534
33pF
50V
50V
C507
1N4148W
100V
OPT
D501
3 . 3
OPT
R507
10K
R502
100
R504
10K
R501
1000pF
50V
C504
4.7K
R518
12
R513
0 . 4 7 u F
50V
C536
12
R515
100pF
50V
C503
10K
R520
POWER_DET
0
R522
OPT
CIS21J121
L501
MMBT3904(NXP)
Q501
E
B
C
THERMAL
NTP-7500L
IC501
1
AGND_PLL
2
AVDD_PLL
3
DVDD_PLL
4
LF
5
DGND_PLL
6
GND_1
7
DGND
8
DVDD
9
SDATA
10
WCK
11
BCK
12
SDA
13
SCL
14
/FAULT
15
MONITOR0
16
MONITOR1
17
MONITOR2
18
BST2B
19
PGND2B
20
OUT2B_1
21
OUT2B_2
22
PVDD2_1
23
PVDD2_2
24
PVDD2_3
25
OUT2A_1
26
OUT2A_2
27
PGND2A
28
BST2A
29
VDR2
30
AGND
31
VCC_5
32
VDR1
33
BST1B
34
PGND1B
35
OUT1B_1
36
OUT1B_2
37
PVDD1_1
38
PVDD1_2
39
PVDD1_3
40
OUT1A_1
41
OUT1A_2
42
PGND1A
43
BST1A
44
/RESET
45
AD
46
GND_IO
47
CLK_I
48
VDD_IO
49
[EP]
SPEAKER_R
SPEAKER_L
2 0 1 1 . 0 8 . 2 1
2 2 0
EMEA INTERACTIVE
AUDIO AMP
GP4_MSTAR
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.
1000pF
50V
C603
+3.5V_ST
100
R613
+3.5V_ST
LED_R/BUZZ
0 . 1 u F
16V
C602
+3.5V_ST
47K
R623
10K
1%
1%
R622
18pF
50V
50V
OPT
C607
100pF
50V
C606
SENSOR_SCL
0 . 1 u F
C601
+3.5V_ST
0 . 1 u F
C600
47K
R614
OPT
47K
R624
1.5K
R629
100
R627
OPT
SENSOR_SDA
18pF
50V
50V
OPT
C608
0
R615
+3.5V_ST
22
R608
10K
1%
R620
KEY1
47K
R625
OPT
NEC_IR
KEY2
100
R612
100
R626
OPT
10K
R630
OPT
10K
R621
OPT
BLM18PG121SN1D
L600
BLM18PG121SN1D
L601
BLM18PG121SN1D
L602
IR_OUT_CTRL
30K
R601
IR_OUT_RS232C
22
R606
22
R604
+5V_ST
30K
R600
10K
R616
+5V_ST
10K
R619
+5V_ST
10K
R617
IR_OUT_HDMI2
30K
R602
+5V_ST
IR_OUT_SIDE_HDMI
10K
R618
IR_OUT_HDMI1
22
R603
22
R605
12507WR-10L
P601
1
2
3
4
5
6
7
8
9
10
11
200pF
5.6V
D600
200pF
5.6V
D601
5.48VTO5.76V
ZD600
5.48VTO5.76V
ZD601
OPT
5.48VTO5.76V
ZD602
OPT
2SC3052
Q602
E
B
C
2SC3052
Q604
E
B
C
2SC3052
Q603
E
B
C
2SC3052
Q606
E
B
C
2SC3052
Q608
E
B
C
2SC3052
Q601
E
B
C
2SC3052
Q605
E
B
C
2SC3052
Q607
OPT
E
B
C
2SC3052
Q600
E
B
C
10K
R610
10K
R611
10K
R609
10K
R607
IR & LED
CONTROL
2 0 1 1 . 0 8 . 2 1
6 2 0
EMEA INTERACTIVE
IR/CONTROL
GP4_MSTAR
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.
RXA1+
RXA1-
0
OPT
R713
RXA0-
3.3K
OPT
R705
RXB3-
RXA3+
RXB0-
RXACK+
10uF
16V
16V
OPT
C701
RXA0+
FF10001-30
P705
HD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3.3K
OPT
R712
RXACK-
PANEL_VCC
RXB1-
RXA0+
RXACK+
0 . 1 u F
16V
16V
C710
FHD
+3.3V_Normal
RXA2-
RXA1-
RXB1+
RXB0+
1000pF
50V
50V
OPT
C702
120-ohm
FHD
L702
0 . 1 u F
16V
16V
HD
C703
RXA4+
10K
OPT
R711
RXA4-
RXB2-
RXA2-
RXB3+
F I - R E 5 1 S - H F - J - R 1 5 0 0
P703
FHD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
+3.3V_Normal
RXACK-
RXBCK-
10K
OPT
R710
RXA3-
1000pF
50V
50V
C709
OPT
10uF
16V
16V
OPT
C700
RXA3-
RXB4+
120-ohm
HD
L701
RXBCK+
10K
BIT_SEL_LOW
R709
RXA3+
RXA2+
RXA2+
RXA1+
PANEL_VCC
RXA0-
RXB4-
RXB2+
0
37_LGD
R700
PWM_DIM
3.3K
37_LGD
R701
R701
OPC&SCANNING_CTRL
+3.3V_Normal
10K
OPT
R702
R702
[ 5 1 P i n L V D S C o n n e c t o r ]
( F o r F H D 6 0 / 1 2 0 H z )
[ 3 0 P i n L V D S C o n n e c t o r ]
(For HD 60Hz_Normal)
BIT_SEL: AUO-GND, LGD-NC
LVDS_SEL
LVDS_SEL
2 0 1 1 . 0 8 . 2 1
7 2 0
EMEA INTERACTIVE
LVDS WAFER
GP4_MSTAR
SCANNING_EN
RXA4+
RXA3-
RXB4-
RXA3+
RXACK-
RXA4+
RXB4+
P o l - c h a n g e
RXB2-
RXB4-
RXB3-
RXB4-
RXA1-
RXB2-
RXA0+
RXB0-
RXA0+
RXB2+
RXB4+
RXA3-
RXB0-
RXA2-
RXB2+
RXA4-
RXA2+
RXA0-
RXB3-
RXB4+
RXBCK+
RXBCK+
C h a n g e i n S 7 L R
RXB3+
RXB1-
RXB3+
RXACK+
RXB1-
RXA1+
RXB1+
RXB0-
RXB0+
RXBCK+
RXB1+
RXACK+
MIRROR
RXACK-
RXA0-
RXB2+
RXB3-
RXA3-
RXA3+
RXA1+
RXA2+
RXA0+
RXB1-
RXB2-
RXB3+
RXA1-
FOR FHD REVERSE(10bit)
RXBCK-
RXA1+
RXACK+
RXBCK-
RXB1+
RXA2+
RXA1-
RXA4-
RXB0+
RXACK-
RXA4+
RXB0+
RXA3+
RXA2-
RXA4-
RXA2-
RXBCK-
RXA0-
RXA2-
RXA4-
RXB1+
RXBCK+
RXB4-
RXA3-
RXA0+
RXB2-
RXA0-
RXBCK+
RXACK+
RXA3-
RXBCK+
RXA2+
RXB0+
RXA3+
MIRROR
RXB4-
RXB0+
RXB1+
RXB0-
RXA4+
RXB0+
RXB4-
RXA1-
RXB2+
RXB3+
RXA2-
C h a n g e i n S 7 L R
RXBCK-
RXA1+
RXA1-
RXA1+
RXB2+
RXA2+
RXA2+
RXB3+
RXACK-
RXBCK-
RXB2-
RXA0+
RXA1-
RXA4-
RXB1-
P o l - c h a n g e
RXA2-
RXB0-
RXA0-
RXB1+
RXA4-
RXACK-
RXB4+
RXB0-
RXA4+
RXA4-
RXB1-
RXB0+
RXB4-
RXB2-
RXB4+
RXA0-
RXACK-
RXACK-
RXA3+
RXB3-
RXB3-
RXA2-
RXA4+
RXACK+
RXB1-
RXA1+
RXA0-
S h i f t
RXB3-
RXBCK-
RXB4+
RXACK+
RXBCK-
RXB2+
RXBCK+
RXA3-
RXA1+
RXA2+
RXB4+
RXB1-
RXA3+
RXB0-
RXB3-
RXB1+
RXA3+
RXA3-
FOR FHD REVERSE(8bit)
RXB3+
RXB2-
RXACK+
RXA0+
RXB3+
RXB2+
RXA1-
RXA0+
RXA4+
Click on the first or last page to see other 37LT640H-ZA (CHASSIS:LD2AF) service manuals if exist.