Read LG 42LK450 (CHASSIS:LJ01M) Service Manual online
THERMAL
THERMAL
THERMAL
THERMAL
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.
ERROR_OUT
Q7505
2SC3052
2SC3052
E
B
C
C7545
0.1uF
50V
Adapter
R7531-*1
2.7K
5V_PANEL
+5V_Normal
C7532
10uF
25V
Adapter
PANEL_CTL
IC7502
MP8670DN-LF-Z
Adapter
3
VCC
2
BST
4
BG
1
SW
5
GND
6
FB
7
EN/SYNC
8
IN
IC7861
AOZ1072AI-3
+5V_TUNER
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
R7863
2.2K
OPT
C403
10uF
10V
10uF
10V
C7958
0.1uF
16V
0.1uF
16V
R7583
0
1/10W
5%
LIPS
1608
R7543
30K
1/10W
1%
Adapter
+12V/+15V
L7912
MLB-201209-0120P-N2
Adapter
+3.5V_ST
C7960
0.1uF
16V
0.1uF
16V
+5V_TUNER
D7500
MBRA340T3G
Adapter
C405
10uF
25V
10uF
25V
+24V_LED
C439
100pF
50V
R400
0
OPT
R7540
120K
120K
1%
Adapter
C444
0.1uF
16V
0.1uF
16V
R7572
0
NON_Adapter
POWER_ON/OFF_1
C476
0.1uF
16V
POWER_DET
R445
2.2K
+5V_Normal
PANEL_VCC
10uF
C461
10V
RL_ON_BUFFER
C7509
0.1uF
0.1uF
16V
OPT
C7565
100pF
100pF
50V
5V_PANEL
C7578
0.1uF
16V
0.1uF
16V
5V_PANEL
C7959
0.1uF
16V
0.1uF
16V
LIPS
+5V
+1.10V_VDDC
C7537
10uF
25V
Adapter
C7547
0.1uF
16V
0.1uF
16V
Q7503
2SC3052
2SC3052
OPT
E
B
C
+24V/+15V
C7865
22uF
16V
22uF
16V
+5V_TUNER
R7862
22K
22K
Adapter
C7550
10uF
25V
10uF
25V
5V_PANEL
L413
R7523
22K
OPT
OPT
R607
11K
11K
1%
OLP
C7515
68uF
35V
35V
NON_Adapter
R428
10K
L7503-*1
CIS21J121
C7570
0.1uF
16V
0.1uF
16V
5V_PANEL
C7522
1uF
50V
1uF
50V
Adapter
L7503
MLB-201209-0120P-N2
NON_Adapter
C7927
0.1uF
50V
0.1uF
50V
R7866
12K
+5V_TUNER
RL_ON_BUFFER
C435
0.1uF
16V
16V
C425
0.1uF
16V
C7861
10uF
25V
10uF
25V
+5V_TUNER
R7529
100K
100K
Adapter
+1.5V_DDR
C440
0.1uF
16V
0.1uF
16V
C492
22uF
16V
22uF
16V
OPT
R446
10K
OPT
R7865
0
0
Adapter
R7957
330
1/10W
+5V_TUNER
C494
1uF
10V
1uF
10V
R465
24K
1%
+5V_TUNER
R7581
1.6K
1/8W
1%
Adapter
R7548
2.7K
1%
Adapter
1608
+5V
+3.5V_ST
+12V/+15V
C453
22uF
22uF
10V
C7501
0.1uF
50V
0.1uF
50V
C7543
0.1uF
50V
0.1uF
50V
Adapter
IC407
AP7173-SPG-13 HF(DIODES)
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
C489
100pF
R7515
10K
10K
R7561
100K
100K
+12V/+15V
C7502
0.1uF
50V
50V
+24V/+15V
L7502-*1
CIS21J121
C420
22uF
16V
22uF
16V
Q403
RSR025P03
S
D
G
R7571
22
Adapter
C7527
0.1uF
50V
Adapter
L415
3.6uH
NR8040T3R6N
INV_CTL
C7541
0.1uF
50V
50V
OPT
R433
10K
10K
C7928
0.01uF
50V
0.01uF
50V
C7519
1uF
25V
1uF
25V
Adapter
R7548-*1
1.21K
1%
LIPS
1608
L7914
BLM18PG121SN1D
NON_Adapter
1608
C7926
0.01uF
50V
Adapter
C7867
0.1uF
16V
0.1uF
16V
+5V_TUNER
R7521
47K
47K
OPT
L425
BLM18PG121SN1D
NON_5V_PANEL
IC403
TPS54319TRE
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]
RL_ON_BUFFER
POWER_ON/OFF_1
C423
4.7uF
16V
4.7uF
16V
OPT
R7559
12K
5V_PANEL
JK7500
JPD003N-M432-4F
Adapter
GND
SW
24V
P7500
SMAW200-12
NON_Adapter
1
+15V
2
+15V
3
GND
4
GND
5
+3.5V_ST
6
+3.5V_ST
7
GND
8
OLP
9
INV_ON
10
P_DIM
11
A_DIM
12
NC
C7961
22uF
16V
22uF
16V
+5V_TUNER
+3.5V_ST
L7508
4.7uH
4.7uH
SP-7850_4.7
Adapter
L420
BLM18PG121SN1D
C7866
0.1uF
16V
0.1uF
16V
+5V_TUNER
R7525
68K
1/16W
5%
Adapter
C7542
3.3uF
50V
3.3uF
50V
Adapter
C7505
0.01uF
50V
R7519
22
1/16W
5%
Adapter
R7566
1.5K
1%
5V_PANEL
R473
1
R7503
22K
22K
L7862
3.6uH
3.6uH
NR8040T3R6N
+5V_TUNER
R7511
6.8K
OPT
Q7506
AO3407A
G
D
S
R7585
100K LIPS
100K LIPS
C7922
0.1uF
16V
0.1uF
16V
5V_PANEL
+24V/+15V
C7925
2.2uF
2.2uF
Adapter
50V
R7516
10K
10K
C7933
0.01uF
50V
0.01uF
50V
R7500
10K
10K
Adapter
C7507-*1
3.9K
3.9K
PWM_PULL_DOWN
110
R7956
1/10W
+5V_TUNER
R410
10K
L7861
+5V_TUNER
R436
15K
15K
C7536
3.3uF
50V
3.3uF
50V
Adapter
C456
22uF
22uF
10V
R7530
33K
12V_PANEL
C7507
1uF
6.3V
OPT
6.3V
OPT
R7531
5.6K
12V_PANEL
C448
3300pF
50V
C447
0.1uF
16V
Q7504
SI4124DY-T1-GE3(VISHAY)
Adapter
3
S_3
2
S_2
4
G
1
S_1
5
D_1
6
D_2
7
D_3
8
D_4
C7526
0.1uF
16V
0.1uF
16V
L7504-*1
CIS21J121
C7538
10uF
10V
10uF
10V
Adapter
L7505
5V_PANEL
+3.3V_Normal
C7552
10uF
25V
10uF
25V
5V_PANEL
L7913
CPI2520NHL3R3ME
Adapter
2520
3.3uH
+24V_LED_driver
+3.3V_Normal
+24V/+15V
+3.5V_ST
L7912-*1
CIS21J121
+3.5V_ST
C7921
0.1uF
16V
0.1uF
16V
+5V_TUNER
FB_CORE
R7565
51K
1%
5V_PANEL
+3.3V_Normal
R434
10K
R7505
4.7K
L7514
3.6uH
3.6uH
NR8040T3R6N
5V_PANEL
R7580
0
C7924
0.1uF
50V
0.1uF
50V
Adapter
R7584
27K
1/16W
1%
OPT
R7958
1
+5V_TUNER
C7533
0.1uF
50V
0.1uF
50V
Adapter
R7861
27K
27K
Adapter
+2.5V_Normal
C7514
0.1uF
0.1uF
50V
C7540
3.3uF
50V
3.3uF
50V
Adapter
+5V_USB
C7862
10uF
25V
10uF
25V
+5V_TUNER
Q400
2SC3052
2SC3052
E
B
C
C7517
68uF
35V
35V
+24V_LED_driver
C7511
0.1uF
0.1uF
16V
NON_Adapter
+24V/+15V
+24V_LED
R7860
10K
Adapter
IC7952
AP1117EG-13
+5V_TUNER
1
ADJ/GND
2 OUT
3
IN
+12V/+15V
R
4
4
1
5
6
K
1
/
1
6
W
1
%
R7501
27K
27K
R416
56K
56K
1%
L7509
3.6uH
3.6uH
NR8040T3R6N
Adapter
C431
0.1uF
16V
0.1uF
16V
C7525
0.01uF
25V
0.01uF
R457
4.3K
4.3K
1/16W
1%
1%
C7504
0.015uF
50V
0.015uF
50V
0.015uF
R7582
100
100
1%
+3.3V_Normal
C493
3300pF
50V
3300pF
50V
IC7512
NCP803SN293
LIPS_PWR_DET_ON_SEMI
1
GND
3
VCC
2
RESET
IC7509
NCP803SN293
PWR_DET_ON_SEMI
1
GND
3
VCC
2
RESET
R
4
5
6
4
.
7
K
1
/
1
6
W
1
%
R7538
6.8K
1%
Adapter
R7588
100
C7566
22uF
16V
22uF
16V
5V_PANEL
C437
22uF
16V
22uF
16V
L7504
MLB-201209-0120P-N2
Adapter
C7544
0.1uF
50V
0.1uF
50V
Adapter
C472
22uF
10V
Q7521
Adapter
AO3407A
G
D
S
+3.5V_ST
560pF
C467
50V
C7864
100pF
50V
OPT
C7932
3.3uF
50V
3.3uF
50V
C7506
1uF
6.3V
OPT
6.3V
OPT
C475
0.1uF
16V
R7517
10K
OPT
C7863
2200pF
+5V_TUNER
+3.5V_ST
R7537
100K
100K
1/8W
5%
5%
C7503
2.2uF
2.2uF
50V
L401
+5V_Normal
C7531
10uF
10uF
25V
C7560
2200pF
5V_PANEL
+5V_TUNER
R
4
4
2
2
7
K
1
/
1
6
W
1
%
R7870
10K
1%
+5V_TUNER
R423
12K
1%
R7832
10K
NON_Adapter
+24V
R432
330K
1/16W
5%
C432
0.1uF
16V
0.1uF
16V
C7524
220pF
220pF
50V
Adapter
R7864
2.2K
OPT
R7527
22K
OPT
L7502
MLB-201209-0120P-N2
NON_Adapter
R7514
1K
1K
R7547-*1
3.9K
1%
LIPS
1608
R7586
100
100
1%
LIPS
C7962
0.1uF
16V
0.1uF
16V
+5V_TUNER
L7517
12V_PANEL
Q7501
AO3407A
G
D
S
R443
10K
10K
R7547
15K
1%
Adapter
1608
C7571
10uF
10V
10uF
10V
Adapter
R7867
10K
+5V_TUNER
L406
3.6uH
NR8040T3R6N
L403
BLM18PG121SN1D
IC7503
MP4460DQ-LF-Z
Adapter
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
R7522
10K
10K
R7542
22K
OPT
Q7502
2SC3052
2SC3052
E
B
C
R7569
10K
OPT
PWM_DIM
A_DIM
+3.5V_ST
P7501
SM14B-SRSS-TB
Adapter
1
24V
2
24V
3
24V
4
24V
5
24V
6
GND
7
GND
8
GND
9
GND
10
GND
11
ERROR_OUT
12
INV_ON
13
NC
14
PWM_DIM
15
GND
+3.3V_Normal
C441
0.1uF
16V
C430
10uF
10V
10uF
10V
C445
0.1uF
16V
0.1uF
16V
OPT
C7529
10uF
16V
16V
OPT
R7530-*1
22K
5V_PANEL
R7570
18K
Adapter
IC7507
AOZ1072AI-3
5V_PANEL
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
LX_1
8
LX_2
+12V/+15V
R7560
10K
5V_PANEL
+12V/+15V
R466
51K
1%
+5V_TUNER
R7567
10K
1%
5V_PANEL
R438
22K
22K
L424
BLM18PG121SN1D
5V_PANEL
R7544
100K
100K
1/10W
1%
1%
Adapter
C413
0.1uF
R608
0
1/16W
5%
IC402
TJ3940S-2.5V-3L
GND
VOUT
VIN
C488
3300pF
50V
R7524
10K
R7507
4.7K
4.7K
RL_ON_BUFFER
Q7507
2SC3052
2SC3052
E
B
C
+3.5V_ST
R7508
0
0
OPT
R7504
10K
10K
OPT
R7506
10K
R7509
10K
RL_ON
+3.5V_ST
Q7508
RT1P141C-T112
1
2
3
R7502
10K
OPT
IC401
TPS54327DDAR
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
C7957
0.1uF
16V
0.1uF
16V
OPT
R7864-*1
3K
PANEL_DISCHARGE_RES
R7863-*1
3K
PANEL_DISCHARGE_RES
R7512
10K
OLP
+2.5V_Normal
C424
1uF
25V
25V
OPT
R7513
22
22
OLP
Q7500
MMBT3904(NXP)
E
B
C
Q7520
Adapter
MMBT3904(NXP)
E
B
C
S7LR Small
POWER
22
2011.03.02.
R2
AMP_VCC Control
real output : 12.3V
R1
S7LR core 1.2V volt
Placed on SMD-TOP
R1
R2
AO3407A Vgs : 8.3V(15V input)
15V-->3.56V
4A
Power_DET
AMP_VCC
Vout=0.827*(1+R1/R2)=1.225V
4A -> 3A modify 090916
close to IC7502
R1
AO3407A Vgs : 10.8V
090916
$ 0.165
LED Driver Power
780 mA
R1
+3.3V_Normal
2A
R2
AO3407A Vgs : 10.8V(24V input)
R1
2000 mA
+5V_Normal(only for 5V PANEL)
24V->3.5V
+5V_USB
3A
2A
ST_3.5V-->3.5V --> 3.375V
$0.148
Vout=(1+R1/R2)*0.765=5.03V
24V->15V
R2
1.5A‘
3.3K -> 1K (threshold voltage up)
Vout=0.8*(1+R1/R2)
R2
PANEL_POWER
Vd=550mV
R1
Max 1000mA
+2.5V/+1.8V
300 mA
+1.5V_DDR
R2
Vout=0.8*(1+R1/R2)=1.5319
Vout=(1+R1/R2)*0.8
+5V_TUNER(only for 5V Tuner)
2A
Max 1A
LDO for Tuner
24V-->3.48V
6.8V
New item
Switching noise reducing [MPS recommend]
$0.37
close to pin
$0.21
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