Read LG 42LS3400 / 42LS349C (CHASSIS:LA25C / LA21B) Service Manual online
THERMAL
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.
SMALL_POWER
2011/10/10
33
GP4L_S7LR2
10uF
C3335
10V
R3358
22
1/16W
5%
+3.5V_ST
+3.5V_ST
C3303
0.1uF
16V
0.1uF
16V
NON_Adapter
L3312
CIC21J501NE
C3363
1uF
25V
1uF
25V
R3383
22K
OPT
C3368
0.01uF
50V
C3355
0.1uF
16V
0.1uF
16V
R3344
27K
27K
560pF
C3349
50V
R3367
68K
+12V/+15V
C3345
10uF
16V
16V
OPT
L3309
BLM18PG121SN1D
R3335
10K
10K
C3338
0.1uF
16V
NON_CI_CAP
+3.3V_Normal
C3372
10uF
25V
L3319
BLM18PG121SN1D
NON_Adapter
R3323
10K
10K
OPT
R3300
0
Q3309
AO3407A
AO3407A
G
D
S
+3.3V_Normal
C3352
22uF
22uF
10V
A_DIM
C3357
22uF
10V
C3320
68uF
35V
35V
+3.5V_ST
C3343
2.2uF
2.2uF
50V
WLED_ENABLE
P3301
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
IC3310
TJ3940S-2.5V-3L
1
GND
2
VOUT
3
VIN
+24V_LED
C3376
3.3uF
50V
3.3uF
50V
C3370
0.1uF
0.1uF
50V
C3375
10uF
10V
10uF
10V
D3300
MBRA340T3G
C3383
0.1uF
50V
0.1uF
50V
IC3309
NCP803SN293
PWR_DET_ONSEMI
1
GND
3
VCC
2
RESET
P3300
SM14B-SRSS-TB
Adapter_26inch
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
Q3310
SI4124DY-T1-GE3(VISHAY)
3
S_3
2
S_2
4
G
1
S_1
5
D_1
6
D_2
7
D_3
8
D_4
R3324
10K
R3370
100K
100K
C3362
0.1uF
16V
0.1uF
16V
LIPS
C3336
0.1uF
16V
0.1uF
16V
NON_CI_CAP
R3304
1K
OLP
R3341
10K
10K
Adapter
WLED_ENABLE
C3304
0.01uF
50V
0.01uF
50V
R3313
6.8K
6.8K
OPT
R3361
22K
22K
R3350
4.3K
1%
1%
+12V/+15V
C3334
10uF
10V
10uF
10V
R3345
22K
+5V_PANEL
+3.5V_ST
C3346
3300pF
50V
R3380
100
100
1%
R3379
100
100
1%
LIPS
R
3
3
5
3
5
6
K
1
/
1
6
W
1
%
C3354
100pF
50V
C3361
0.1uF
50V
0.1uF
50V
C3328
0.1uF
16V
0.1uF
16V
OPT
R3340
10K
OPT
+24V_LED_driver
R3366
0
0
JK3300
JPD003N-M432-4F
Adapter
GND
SW
24V
R3348
22K
22K
R3374
100K
100K
ERROR_OUT
POWER_ON/OFF_1
C3367
1uF
50V
1uF
50V
C3371
0.1uF
16V
0.1uF
16V
NON_CI_CAP
R3381
120K
120K
1%
R3334
10K
+24V/+15V
R3388
10K
10K
NON_Adapter
L3313
BLM18PG121SN1D
+24V/+15V
PWM_DIM
+3.3V_Normal
L3315
CPI2520NHL3R3ME
Adapter
2520
3.3uH
R3342
22K
OPT
C3317
0.1uF
0.1uF
50V
R3346-*1
5.6K
12V_PANEL
IC3305
AP7173-SPG-13 HF(DIODES)
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
C3324
22uF
16V
22uF
16V
+3.3V_Normal
+12V/+15V
+5V_Normal
+24V/+15V
+3.5V_ST
+24V
C3300
0.1uF
16V
0.1uF
16V
OPT
C3382
0.1uF
16V
0.1uF
16V
OPT
R3346
2.7K
+5V_PANEL
+5V_Normal
C3351
0.01uF
50V
C3360
0.1uF
16V
R3309
10K
OPT
R3384
30K
1/10W
1%
R3389
0
NON_Adapter
+24V_LED_driver
L3316
4.7uH
SP-7850_4.7
C3385
0.1uF
50V
0.1uF
50V
PANEL_CTL
C3358
0.1uF
16V
0.1uF
16V
R3375
1.6K
1/8W
1%
R3343
15K
15K
C3316
0.1uF
50V
50V
Adapter
R3328
10K
PANEL_VCC
C3364
0.1uF
16V
0.1uF
16V
PWM_DIM
C3374
0.1uF
50V
0.1uF
50V
R3360
27K
27K
+3.5V_ST
IC3304
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]
C3348
4.7uF
16V
INV_CTL
RL_ON_BUFFER
L3317
3.6uH
NR8040T3R6N
R3314
12K
C3344
0.1uF
16V
C3381
3.3uF
50V
3.3uF
50V
C3380
10uF
10V
10uF
10V
+3.5V_ST
R3369
10K
10K
R3301
4.7K
4.7K
NON_Adapter
C3339
0.1uF
50V
0.1uF
50V
RL_ON
R3357
10K
R3378
22
+24V/+15V
+3.3V_Normal
R3347
330K
330K
R3311
10K
10K
+1.5V_DDR
R3376
6.8K
1%
+3.5V_ST
C3386
10uF
10V
10uF
10V
R3351
0
1/16W
5%
+12V/+15V
R3377
100K
1/8W
5%
100K
1/8W
5%
C3356
3.3uF
50V
3.3uF
50V
R3365
27K
1/16W
1%
OPT
R3312
1K
1K
R3387
100K
1/10W
1%
100K
1/10W
1%
R3303
10K
OLP
C3342
0.1uF
16V
0.1uF
16V
R3349
4.7K
1%
4.7K
1%
+24V/+15V
RL_ON_BUFFER
C3301
0.1uF
50V
0.1uF
50V
R3354
0
OPT
C3377
10uF
25V
C3359
0.01uF
50V
0.01uF
50V
Q3307
AO3407A
G
D
S
R
3
3
5
2
2
7
K
1
/
1
6
W
1
%
R3339
10K
R3336
10K
10K
OPT
L3314
3.6uH
NR8040T3R6N
C3378
3.3uF
50V
3.3uF
50V
IC3307
MP4460DQ-LF-Z
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
C3341
0.1uF
0.1uF
16V
R3329
0
0
OPT
R3359
18K
R3308
10K
10K
POWER_DET
R3315
10K
C3365
2.2uF
2.2uF
50V
+3.5V_ST
R3382
10K
10K
OPT
+3.3V_Normal
Q3306
AO3407A
G
D
S
WLED_ENABLE
FB_CORE
C3350
22uF
22uF
10V
R3302
100
100
RL_ON_BUFFER
+1.10V_VDDC
C3353
0.1uF
50V
50V
OPT
R3373
100K
100K
LIPS
+3.5V_ST
OLP
C3318
2200pF
50V
IC3306
MP8670DN-LF-Z
3
VCC
2
BST
4
BG
1
SW
5
GND
6
FB
7
EN/SYNC
8
IN
R3337
10K
10K
L3305
3.6uH
NR8040T3R6N
R3345-*1
33K
33K
12V_PANEL
R3332
4.7K
4.7K
R3338
22K
OPT
IC3308
NCP803SN293
LIPS_PWR_DET_ONSEMI
1
GND
3
VCC
2
RESET
C3384
0.1uF
50V
RL_ON_BUFFER
+2.5V_Normal
C3388
0.1uF
16V
0.1uF
16V
POWER_ON/OFF_1
+24V_LED
R3364
0
1/16W
5%
Q3302
RT1P141C-T112
1
2
3
Q3304
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
Q3308
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
C3337
0.015uF
50V
0.015uF
50V
PANEL_VCC_0.015uF
Q3300
MMBT3904(NXP)
E
B
C
Q3301
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
Q3303
MMBT3904(NXP)
OPT
E
B
C
Q3305
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
Q3311
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
+5V_Normal
C3322
22uF
16V
22uF
16V
+5V_USB
IC3302
AOZ1051PI
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
C3302
10uF
25V
10uF
25V
L3301
CIC21J501NE
R3306
11K
11K
1%
R3390
12K
12K
R3305
56K
56K
1%
C3325
22uF
16V
22uF
16V
OPT
+12V/+15V
R3307
12K
1%
C3390
100pF
100pF
OPT
L3310
BLM18PG121SN1D
Non_5V_PANEL
R3310
10K
L3307
3.6uH
NR8040T3R6N
C3391
10uF
25V
10uF
25V
OPT
C3392
0.1uF
16V
0.1uF
16V
OPT
C3393
0.1uF
16V
0.1uF
16V
OPT
C3311
2200pF
50V
2200pF
50V
L3321
CIC21J501NE
CIC21J501NE
C3305
10uF
25V
10uF
25V
C3307
10uF
25V
10uF
25V
OPT
C3312
0.1uF
16V
0.1uF
16V
OPT
IC3300
AOZ1051PI
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
R3319
56K
56K
1%
R3321
12K
1%
C3323
100pF
100pF
OPT
R3320
11K
11K
1%
C3331
22uF
16V
22uF
16V
OPT
IC3308-*1
APX803D29
LIPS_PWR_DET_DIODES
1
GND
3
VCC
2
RESET
IC3309-*1
APX803D29
PWR_DET_DIODES
1
GND
3
VCC
2
RESET
C3369
220pF
220pF
50V
C3340
0.01uF
50V
PANEL_VCC_0.01uF
C3347
3300pF
50V
R3356
2.2K
PANEL_DISCHARGE_RES
R3355
2.2K
PANEL_DISCHARGE_RES
L3303
CIS21J121
NON_Adapter
L3300
CIS21J121
NON_Adapter
L3308
CIS21J121
Adapter
L3304
CIS21J121
Adapter
R3386
1
1/16W
5%
Q3312
AO3407A
G
D
S
C3314
0.01uF
50V
0.01uF
50V
C3394
0.01uF
50V
0.01uF
50V
C3373
4.7uF
16V
4.7uF
16V
C3387
0.1uF
16V
0.1uF
16V
OPT
C3379
0.1uF
16V
R3368
10K
C3366
0.1uF
16V
NON_CI_CAP
C3389
22uF
16V
22uF
16V
R3371
22K
22K
R3385
10K
OPT
R3362
3.9K
3.9K
1%
LIPS
R3363
1.2K
1.2K
1%
LIPS
L3318
BLM18SG700TN1D
70-ohm
L3320
12V_PANEL
70-ohm
L3311
+5V_PANEL
70-ohm
R3372
100
2.5A
Vout=0.8*(1+R1/R2) = 1.5319
1A
R2
R1
1.5A
+1.5V_DDR
Switching noise reducing [MPS recommend]
S7LR core 1.2V volt
Vd=550mV
780 mA
AMP_VCC
close to pin
+3.3V_Normal
real output : 12.3V
New item
Vout=0.827*(1+R1/R2)=1.225V
AO3407A Vgs : 10.8V(24V input)
UNDER CHECKING
3A
3A
24V->15V
R1
Power for LED driver
R1
300 mA
R2
AO3407A Vgs : 8.3V(15V input)
AMP_VCC Control
close to IC7502
ST_3.5V-->3.5V --> 3.375V
R2
PANEL_POWER
MAX 1A
24V->3.5V
Placed on SMD-TOP
+5V_Normal
(LIPS_PWR_DET_ONSEMI)
Power_DET
+2.5V
AO3407A Vgs : 10.8V
3.3K -> 1K (threshold voltage up)
24V-->3.48V
Max 1000mA
* H/W option : Adapter_26inch
* H/W option : +5V_PANEL
* H/W option : Adapter
* H/W option : Adapter
* H/W option : Adapter
R2
+5V_USB
Vout=0.8*(1+R1/R2)
3A
R1
2000 mA
R2
R1
Vout=0.8*(1+R1/R2)
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