Read LG 42LN549C / 42LN549E (CHASSIS:LJ3AC) Service Manual 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.
100pF
50V
C436
+3.5V_ST
10uF
25V
C431
10K
R426
+3.5V_ST
+24V
22uF
10V
C432
10uF
10V
C425
10K
R454
TH
ER
M
A
L
AP7173-SPG-13 HF(DIODES)
IC404
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
0.1uF
16V
C438
NCP803SN293
IC405
PWR_DET_ON_SEMI
1
GND
3
VCC
2 RESET
POWER_DET
POWER_ON/OFF_1
1/16W 330K 5%
R433
PANEL_VCC
10K
R429
NCP803SN293
IC406
PD_+24V_PWR_DET_ON_SEMI
1
GND
3
VCC
2 RESET
0.1uF
16V
C426
100
R462
PD_+24V
1/16W
27K
1%
1%
R438
10uF
10V
C418
+1.10V_VDDC
L408
0.1uF
16V
C443
NON_CI_CAP
+3.5V_ST
+1.5V_DDR
+12V
0.1uF
16V
C446
+3.3V_Normal
0.1uF
16V
C440
100K
R460
PD_+24V
33K
R435
BLM18PG121SN1D
L410
22uF
10V
C434
PANEL_CTL
001:AL22
10uF
10V
C416
560pF
50V
C433
0.1uF
16V
C417
NON_CI_CAP
+3.5V_ST
+3.5V_ST
0.1uF
16V
C419
NON_CI_CAP
10K
R430
AO3407A
Q406
G
D
S
1/16W
4.7K
1%
R437
15K
R432
0.1uF
16V
C442
4.7uF
16V
C444
FET_AOS
TJ3940S-2.5V-3L
IC402
1
GND
2 VOUT
3
VIN
0.1uF
16V
C430
10K
R452
OPT
THERMAL
TPS54319TRE
IC403
1
VIN_1
3
GND_1
7
C
O
M
P
9
SS/TR
10
PH_1
11
PH_2
12
PH_3
1
3
B
O
O
T
1
4
PW
R
G
D
1
5
EN
1
6
V
IN
_3
5
A
G
N
D
8
R
T
/C
L
K
6
V
SE
N
SE
4
GND_2
2
VIN_2
17
E
P
[G
N
D
]
100K
R457
0.1uF
16V
C421
NON_CI_CAP
+3.3V_Normal
0.1uF
C445
5.6K
R436
+12V
0.1uF
16V
OPT
C447
+3.3V_Normal
10K
R425
10K
OPT
R466
1/16W
56K
1%
1%
R439
10K
R465
OPT
+2.5V_Normal
0.1uF
16V
C441
PD_+24V
100
R461
+3.3V_Normal
22K
R458
10K
R456
1/16W
4.3K
1%
R440
22uF
10V
C439
NR8040T3R6N
3.6uH
L411
APX803D29
PWR_DET_ON_DIODES
IC405-*1
1
GND
3 VCC
2
RESET
APX803D29
PD_+24V_PWR_DET_DIODES
IC406-*1
1
GND
3 VCC
2
RESET
0.01uF
50V
C423
0.01uF
3300pF
50V
C429
3300pF
C427
1.5K
1%
R444
PD_+24V
2.7K
1%
PD_+12V
R450
0
5%
PD_+3.5V
R455
1
R434
8.2K
1%
R443
PD_+24V
0.015uF
50V
C420
0.015uF
MMBT3904(NXP)
Q407
E
B
C
MMBT3904(NXP)
Q405
E
B
C
0.33uF
16V
C422
1.2K
1%
R451
PD_+12V
AO3407A
Q408
FET_AOS
G
D
S
0.1uF
25V
C424
0.1uF
25V
C437
NON_CI_CAP
0.1uF
25V
C435
OPT
10uF
25V
OPT
C428
100
R459
FET_AOS
5.1K
1%
R451-*1
PD_KR_42_LIPS
CIS21J121
120
L409
BLM18SG700TN1D
L412
100
1%
R455-*1
PD_KR_42_LIPS
4.7K
R441-*1
PANEL_DISCHARGE_RES_4.7K
4.7K
R442-*1
PANEL_DISCHARGE_RES_4.7K
AO3435
Q408-*2
FET_2.5V_AOS
G
D
S
DMP2130L
Q408-*1
FET_2.5V_DIODE
G
D
S
2.2K
R459-*1
FET_2.5V
2.2uF
10V
C444-*1
FET_2.5V
5.6K
R441
PANEL_DISCHARGE_RES_5.6K
5.6K
R442
PANEL_DISCHARGE_RES_5.6K
22uF
10V
C448
5.1K
5.1K_PANEL_DISCHARGE
R441-*2
5.1K
5.1K_PANEL_DISCHARGE
R442-*2
10K
R413
PWM_DIM
PWM1
MLB-201209-0120P-N2
L405
+24V
10K
R418
100
T120
R420
+3.5V_ST
SMAW200-H18S1
P401
14
12V
9
24V
4
PDIM#1
18
GND
13
12V
8
GND
3
3.5V
17
GND
12
GND
7
GND
2
DRV ON
16
N.C
11
GND
6
PDIM#2
1
PWR ON
15
12V
10
24V
5
3.5V
19
.
+3.5V_ST
10K
OPT
R406
10K
R417
100
R415
MMBT3904(NXP)
Q401
E
B
C
MLB-201209-0120P-N2
L413
CIC21J501NE
L402
MMBT3904(NXP)
Q403
E
B
C
4.7K
R410
1K
R416
CIC21J501NE
L403
+3.5V_ST
+12V
0.1uF
16V
16V
C403
10K
R409
0.1uF
16V
16V
C407
+3.3V_Normal
INV_CTL
0.1uF
50V
50V
C405
RL_ON
+3.5V_ST
33K
OPT
R414
3.9K
OPT
R419
MMBT3906(NXP)
Q402
1
2
3
10K
R407
100pF
C411
10uF
25V
C402
+5V_USB
22uF
16V
OPT
C410
11K
1%
R411
56K
1%
R408
+12V
0.1uF
50V
C408
3300pF
50V
C406
10K
R405
L401
22uF
16V
C409
1uF
10V
C404
TH
ER
M
A
L
TPS54327DDAR
IC401
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
12K
1%
R412
+5V_Normal
NR8040T3R6N
3.6uH
L404
BLM18PG121SN1D
L406
68uF
35V
C401
EXT_SPK
R2
+1.5V_DDR
New item
Power_DET
+ 2 4 V - - > 3 . 7 8 V - - > 3 . 9 2 V ( 3 . 7 9 V )
+ 1 2 V - - > 3 . 5 8 V - - > 3 . 8 2 V ( 3 . 6 8 V )
+ 1 2 V - - > 3 . 5 8 V - - > 3 . 8 2 V ( 3 . 6 8 V )
Vd=550mV
+2.5V/+1.8V
R1
+3.3V_Normal
Vout=0.8*(1+R1/R2)=1.5319
Vout=0.827*(1+R1/R2)=1.225V
R1
R2
$ 0.165
S 7 L R c o r e 1 . 2 V v o l t
+ 3 . 5 V _ S T - - > 3 . 3 7 5 V - - > 3 . 4 6 V
780 mA
Max 1000mA
+ 1 8 . 5 V - - > 3 . 5 V - - > 3 . 7 5 V ( 3 . 5 9 V )
300 mA
1.5A
PANEL_POWER
3A
+ 2 0 V - - > 3 . 5 1 V - - > 3 . 7 6 V ( 3 . 5 9 V )
POWER
4
FROM LIPS & POWER B/D
LA2AW
2 0 1 2 . 0 9 . 1 1
2000 mA
R1
R2
3A
Vout=(1+R1/R2)*0.765=5.03V
+5V_USB
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