26LT673H (CHASSIS:LA2AM) - LG TV Service Manual (repair manual). Page 24

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THERMAL
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.
R451
10K
IC405
AOZ1051PI
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
C417
2200pF
L423-*1
0
1/10W
5%
3.3V_REGISTER
C401
10uF
25V
C419
100pF
50V
OPT
L409
IC404
AOZ1051PI
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
+5V_Normal
C400
10uF
25V
L411
3.6uH
NR8040T3R6N
L423
CIC21J501NE
3.3V_BEAD_SS
R438
10K
1%
L400
3.6uH
NR8040T3R6N
C452
100pF
50V
OPT
+3.3V_Normal
L403
C459
0.1uF
16V
C457
0.1uF
16V
C422
22uF
16V
C454
22uF
16V
C415
2200pF
+12V/+15V
C413
0.1uF
16V
R434
12K
+12V/+15V
C402
10uF
25V
C462
22uF
10V
OPT
C410
10uF
25V
R437
10K
L405
BEAD_SS
R425
9.1K
C421
0.1uF
16V
POWER_ON/OFF1
+3.5V_ST
R459
10K
C449
3300pF
50V
C414
3300pF
50V
R422
10K
1%
R466
22K
1%
R443
11K
1%
R464
56K
1%
R465
12K
1%
IC401
AOZ1051PI
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
R416
56K
1%
C493
3300pF
50V
L401
BEAD_SS
R609
11K
1%
R423
12K
1%
C405
10uF
25V
C4074
0.1uF
16V
+12V/+15V
C494
2200pF
50V
C420
22uF
16V
C4072
100pF
OPT
C4073
0.1uF
16V
+5V_USB
R608
12K
C492
22uF
16V
OPT
C4075
10uF
25V
R410
10K
L406
3.6uH
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]
C488
3300pF
C447
0.33uF
16V
C439
100pF
50V
C453
22uF
10V
L413
BEAD_SS
C448
3300pF
50V
L415
3.6uH
NR8040T3R6N
C456
22uF
10V
R436
15K
+1.10V_VDDC
C441
0.1uF
16V
C431
0.1uF
16V
R424
0
C444
0.1uF
16V
R432
330K
1/16W
5%
R445
0
OPT
FB_CORE
+3.5V_ST
R428
10K
+3.3V_Normal
R441
56K
1/16W
1%
C430
10uF
10V
R442
27K
1/16W
1%
+2.5V_Normal
C440
0.1uF
16V
IC402
TJ3940S-2.5V-3L
1
GND
2
VOUT
3
VIN
C403
10uF
10V
C432
0.1uF
16V
R473
1
+3.3V_Normal
R457
4.3K
1/16W
1%
IC407
AP7173-SPG-13 HF(DIODES)
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
+1.5V_DDR
+3.3V_Normal
10uF
C461
10V
R456
4.7K
1/16W
1%
R446
10K
L420
BLM18PG121SN1D
C476
0.1uF
16V
C472
22uF
10V
+3.5V_ST
R433
10K
560pF
C467
50V
C443
10uF
25V
PANEL_CTL
001:AL22
+3.5V_ST
R405-*2
4.7K
PANEL_DISCHARGE_RES_4.7K
+12V/+15V
R407
2.2K
OPT
Q406
MMBT3904(NXP)
OPT
E
B
C
R430
10K
R405-*1
3K
PANEL_DISCHARGE_RES_3K
C442
10uF
25V
OPT
R429
47K
OPT
PANEL_VCC
R440
5.6K
R435
22K
OPT
Q407
MMBT3904(NXP)
E
B
C
C455
0.1uF
25V
R431
22K
OPT
C438
0.1uF
25V
R407-*2
4.7K
PANEL_DISCHARGE_RES_4.7K
R439
33K
Q409
AO3407A
G
D
S
C409
0.015uF
50V
0.015uF
R489
10K
C451
0.1uF
25V
OPT
C436
0.01uF
50V
0.01uF
R405
2.2K
OPT
R407-*1
3K
PANEL_DISCHARGE_RES_3K
L412
BEAD_SS
120
R444
10K
OPT
R480
100
POWER_DET
C412
0.1uF
16V
IC409
NCP803SN293
1
GND
3
VCC
2
RESET
+24V/+15V
R482
8.2K
1%
R463
10K
OPT
+3.5V_ST
R404
100K
R403
1.5K
1%
C474
0.1uF
C463
68uF
35V
Q404
MMBT3904(NXP)
E
B
C
R452
10K
R402
0
R450
1K
Q403
MMBT3904(NXP)
E
B
C
JK400
JPD003N-M432-4F
GND
SW
24V
RL_ON_BUFFER
L410
MLB-201209-0120P-N2
Adapter_MAG
R449
10K
INV_CTL
C416
0.01uF
50V
+24V/+15V
PWM_DIM
R453
4.7K
+24V_LED
R421
10K
+3.5V_ST
C408
0.1uF
50V
+3.3V_Normal
L407
MLB-201209-0120P-N2
Adapter_MAG
R409
100
+24V_LED_driver
C424
1uF
10V
OPT
R454
10K
ERROR_OUT
+3.5V_ST
RL_ON
C460
0.1uF
50V
C424-*1
3.9K
PWM_PULL_DOWN
P400
SM14B-SRSS-TB
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
C411
0.1uF
50V
C469
0.01uF
50V
C468
3.3uF
50V
C465
2.2uF
50V
+24V/+15V
Q408
MMBT3904(NXP)
E
B
C
Q410
AO3407A
G
D
S
R461
22K
R455
10K
OPT
R458
10K
L416
CPI2520NHL3R3ME
2520
3.3uH
+24V
C466
0.01uF
50V
C464
0.1uF
50V
R460
27K
+24V_LED
R448
22K
+24V_LED_driver
R419
10K
C428
0.1uF
50V
Q402
AO3407A
G
D
S
RL_ON_BUFFER
Q401
MMBT3904(NXP)
E
B
C
C446
2.2uF
50V
R427
27K
C458
0.01uF
50V
C406
1uF
50V
+24V/+15V
C427
0.1uF
50V
R420
120K
1%
R414
10K
C423
10uF
25V
C434
3.3uF
50V
C404
1uF
25V
L402
4.7uH
SP-7850_4.7
R418
6.8K
1%
C450
0.1uF
50V
Q400
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
C437
3.3uF
50V
12V_ON
R406
0
C426
10uF
25V
+12V/+15V
R417
1.6K
1/8W
1%
R400
22
1/16W
5%
IC400
MP8670DN-LF-Z
3
VCC
2
BST
4
BG
1
SW
5
GND
6
FB
7
EN/SYNC
8
IN
D400
MBRA340T3G
C407
220pF
50V
C429
10uF
10V
C433
3.3uF
50V
R408
68K
1/16W
5%
C418
0.1uF
50V
+24V/+15V
R401
18K
C445
0.1uF
50V
C435
0.1uF
50V
+3.5V_ST
C425
10uF
10V
R412
200K
1/8W
1%
R426
30K
1/10W
1%
L404
3.6uH
NR8040T3R6N
R413
22
IC406
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
R411
100K
R447
105K
1/10W
1%
POWER_ON/OFF1
RL_ON_BUFFER
R467
0
R462
0 OPT
+3.5V_ST
R468
10K
OPT
+3.3V_Normal
+3.3V_Normal
Q405
RT1P141C-T112
E
B
C
JP410
JP412
JP409
JP411
ZD400
5V
ESD_+3.3V_Normal
L401-*1
BEAD_Non_SS
L405-*1
BEAD_Non_SS
L413-*1
BEAD_Non_SS
L423-*2
3.3V_BEAD_Non_SS
L412-*1
BEAD_Non_SS
L407-*1
BEAD_Non_SS
L410-*1
BEAD_Non_SS
POWER_LARGE
4
Max 1000mA
Vout=0.8*(1+R1/R2)=1.5319
+1.5V_DDR
PANEL_POWER
S7LR core 1.2V volt
300 mA
+2.5V/+1.8V
R1
MAX 1A
R2
+3.3V_Normal
3A
3A
1934 mA
+5V_Normal
R1
R2
Vout=0.8*(1+R1/R2)=3.36V
Vout=0.8*(1+R1/R2)=5.27V
3A
+5V_USB
2000 mA
Vout=0.8*(1+R1/R2)
R2
R1
$ 0.165
R1
3A
R2
Vout=0.827*(1+R1/R2)=1.225V
Vd=550mV
R1
1.5A
R2
New item
+18.5V --> 3.5V --> 3.75V (3.59V)
+20V --> 3.51V --> 3.76V (3.59V)
+24V --> 3.78V --> 3.92V (3.79V)
+12V --> 3.58V --> 3.82V (3.68V)
Power_DET
+3.5V_ST --> 3.375V --> 3.46V
3.3K -> 1K (threshold voltage up)
AMP_VCC Control
AMP_VCC
AO3407A Vgs : 10.8V(24V input)
2A
AO3407A Vgs : 8.3V(15V input)
AO3407A Vgs : 10.8V
LED Driver Power
R2
Placed on SMD-TOP
$0.37
close to IC7502
R1
24V->12V
24V->3.5V
close to pin
$0.21
Switching noise reducing [MPS recommend]
20121026
26LT673H-UA
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