Read LG 26LT670H (CHASSIS:LA2AE) 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.
10K
R451
TH
ER
M
A
L
AOZ1051PI
IC405
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
2200pF
C417
1/10W
0
5%
3.3V_REGISTER
L423-*1
10uF
25V
C401
100pF
50V
OPT
C419
L
4
0
9
TH
ER
M
A
L
AOZ1051PI
IC404
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
+5V_Normal
10uF
25V
C400
NR8040T3R6N
3.6uH
L411
CIC21J501NE
3.3V_BEAD
L423
10
K
1%
R
43
8
NR8040T3R6N
3.6uH
L400
100pF
50V
OPT
C452
+3.3V_Normal
L
4
0
3
0.1uF
16V
C459
0.1uF
16V
C457
22uF
16V
C422
22uF
16V
C454
2200pF
C415
+12V/+15V
0.1uF
16V
C413
12K
R434
+12V/+15V
10uF
25V
C402
22uF
10V
OPT
C462
10uF
25V
C410
10K
R437
L405
9.1K
R425
0.1uF
16V
C421
POWER_ON/OFF1
+3.5V_ST
10
K
R
45
9
3300pF
50V
C449
3300pF
50V
C414
10
K
1%
R
42
2
22
K
1%
R
46
6
11
K
1%
R
44
3
56
K
1%
R
46
4
12
K
1%
R
46
5
TH
ER
M
A
L
AOZ1051PI
IC401
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SS
8
NC
9
[EP]LX
56K
1%
R416
3300pF
50V
C493
L401
11K
1%
R609
12K
1%
R423
10uF
25V
C405
0.1uF
16V
C4074
+12V/+15V
2200pF
50V
C494
22uF
16V
C420
100pF
C4072
OPT
0.1uF
16V
C4073
+5V_USB
12K
R608
22uF
16V
C492
OPT
10uF
25V
C4075
10K
R410
3.6uH
L406
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
]
3300pF
C488
0.33uF
16V
C447
100pF
50V
C439
22uF
10V
C453
L413
3300pF
50V
C448
NR8040T3R6N
3.6uH
L415
22uF
10V
C456
15K
R436
+1.10V_VDDC
0.1uF
16V
C441
0.1uF
16V
C431
0
R
42
4
0.1uF
16V
C444
1/16W 330K 5%
R432
0
OPT
R445
FB_CORE
+3.5V_ST
10K
R428
+3.3V_Normal
1/16W
56K
1%
1%
R441
10uF
10V
C430
1/16W
27K
1%
1%
R442
+2.5V_Normal
0.1uF
16V
C440
TJ3940S-2.5V-3L
IC402
1
GND
2 VOUT
3
VIN
10uF
10V
C403
0.1uF
16V
C432
1
R473
+3.3V_Normal
1/16W
4.3K
1%
R457
TH
ER
M
A
L
AP7173-SPG-13 HF(DIODES)
IC407
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
10V
C461
1/16W
4.7K
1%
R456
10
K
R
44
6
BLM18PG121SN1D
L420
0.1uF
16V
C476
22uF
10V
C472
+3.5V_ST
10K
R433
560pF
50V
C467
10uF
25V
C443
PANEL_CTL
001:AL22
+3.5V_ST
4.7K
R405-*2
PANEL_DISCHARGE_RES_4.7K
+12V/+15V
2.2K
R407
OPT
MMBT3904(NXP)
Q406
OPT
E
B
C
10K
R430
3K
R405-*1
PANEL_DISCHARGE_RES_3K
10uF
25V
OPT
C442
47K
R429
OPT
PANEL_VCC
5.6K
R440
22K
R435
OPT
MMBT3904(NXP)
Q407
E
B
C
0.1uF
25V
C455
22K
R431
OPT
0.1uF
25V
C438
4.7K
R407-*2
PANEL_DISCHARGE_RES_4.7K
33K
R439
AO3407A
Q409
G
D
S
0.015uF
50V
C409
0.015uF
10K
R489
0.1uF
25V
C451
OPT
0.01uF
50V
C436
0.01uF
2.2K
R405
OPT
3K
PANEL_DISCHARGE_RES_3K
R407-*1
CIS21J121
120
L412
10
K
O
PT
R
44
4
100
R480
POWER_DET
0.1uF
16V
C412
NCP803SN293
IC409
1
GND
3
VCC
2 RESET
+24V/+15V
8.2K
1%
R482
10K
R463
OPT
+3.5V_ST
100K
R404
1.5K
1%
R403
0.1uF
C474
68uF
35V
C463
MMBT3904(NXP)
Q404
E
B
C
MMBT3906(NXP)
Q405
E
B
C
10K
R452
0
R402
1K
R450
MMBT3904(NXP)
Q403
E
B
C
CIS21J121
L410-*1
JPD003N-M432-4F
JK400
GND
SW
24V
RL_ON_BUFFER
MLB-201209-0120P-N2
Adapter_MAG
L410
10K
R449
INV_CTL
0.01uF
50V
C416
+24V/+15V
PWM_DIM
4.7K
R453
+24V_LED
10K
R421
+3.5V_ST
0.1uF
50V
C408
+3.3V_Normal
MLB-201209-0120P-N2
Adapter_MAG
L407
CIS21J121
L407-*1
100
R409
+24V_LED_driver
1uF
10V
OPT
C424
10K
R454
ERROR_OUT
+3.5V_ST
RL_ON
0.1uF
50V
C460
3.9K
PWM_PULL_DOWN
R415
SM14B-SRSS-TB
P400
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
0.1uF
50V
C411
0.01uF
50V
C469
3.3uF
50V
C468
2.2uF
50V
C465
+24V/+15V
MMBT3904(NXP)
Q408
E
B
C
AO3407A
Q410
G
D
S
22K
R461
10K
OPT
R455
10K
R458
CPI2520NHL3R3ME 2520
3.3uH
L416
+24V
0.01uF
50V
C466
0.1uF
50V
C464
27K
R460
+24V_LED
22K
R448
+24V_LED_driver
10K
R419
0.1uF
50V
C428
AO3407A
Q402
G
D
S
RL_ON_BUFFER
MMBT3904(NXP)
Q401
E
B
C
2.2uF
50V
C446
27K
R427
0.01uF
50V
C458
1uF
50V
C406
+24V/+15V
0.1uF
50V
C427
120K
1%
R420
10K
R414
10uF
25V
C423
3.3uF
50V
C434
1uF
25V
C404
SP-7850_4.7
4.7uH
L402
6
.8
K
1%
R
41
8
0.1uF
50V
C450
SI4124DY-T1-GE3(VISHAY)
Q400
3
S_3
2
S_2
4
G
1
S_1
5
D_1
6
D_2
7
D_3
8
D_4
3.3uF
50V
C437
12V_ON
0
R406
10uF
25V
C426
+12V/+15V
1/
8W
1
.6
K
1%
R
41
7
W6
1/
1
2
2
5%
00
4
R
MP8670DN-LF-Z
IC400
3
VCC
2
BST
4
BG
1
SW
5
GND
6
FB
7
EN/SYNC
8
IN
MBRA340T3G
D400
220pF
50V
C407
10uF
10V
C429
3.3uF
50V
C433
1/
16
W
68
K
5%
R
40
8
0.1uF
50V
C418
+24V/+15V
18
K
R
40
1
0.1uF
50V
C445
0.1uF
50V
C435
+3.5V_ST
10uF
10V
C425
1/8W
200K
1%
R412
1/
10
W
30
K
1%
R
42
6
NR8040T3R6N
3.6uH
L404
2
2
R
41
3
TH
ER
M
A
L
MP4460DQ-LF-Z
IC406
3
EN
2
SW_2
4
COMP
1
SW_1
5
FB
6
GND
7
FREQ
8
VIN_1
9
VIN_2
10
BST
1
1
EP_GND
100K
R411
1/10W
105K
1%
R447
POWER_ON/OFF1
RL_ON_BUFFER
0
R467
0 OPT
R462
+3.5V_ST
10
K
O
PT
R
46
8
20111008
37LT670H-UA
POWER_LARGE
4
Max 1000mA
Vout=0.8*(1+R1/R2)=1.5319
+1.5V_DDR
PANEL_POWER
S 7 L R c o r e 1 . 2 V v o l t
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
+ 1 8 . 5 V - - > 3 . 5 V - - > 3 . 7 5 V ( 3 . 5 9 V )
+ 2 0 V - - > 3 . 5 1 V - - > 3 . 7 6 V ( 3 . 5 9 V )
+ 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 )
+ 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 )
Power_DET
+ 3 . 5 V _ S T - - > 3 . 3 7 5 V - - > 3 . 4 6 V
3 . 3 K - > 1 K ( t h r e s h o l d v o l t a g e u p )
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
c l o s e t o I C 7 5 0 2
R1
24V->12V
24V->3.5V
c l o s e t o p i n
$0.21
S w i t c h i n g n o i s e r e d u c i n g [ M P S r e c o m m e n d ]
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