LG 32LF550B Service Manual page 19

POWER
FROM POWER B/D 13.2V
TR_KEC
Q401-*1
2N3906S-RTK
+3.5V_ST
TR_NXP
Q401
MMBT3906(NXP)
1 3
OPT
TR_KEC
R412
Q400-*1
R406 2 33K
2N3904S
10K
+3.5V_ST C
R404
B 4.7K
OPT
R400
TR_NXP
10K E C
R402 Q400
10K MMBT3904(NXP)
B
RL_ON P401
SMAW200-H12S5K(BK)(LTR)
R401 E
10K
PWR_ON
1
TVS_SEMTECH GND
+3.3V_Normal 3
ZD404
D13.2V
5
5V
+3.5V_ST
A13.2V
7
R420
GND
1K R419 9
100
DRV_ON
R426 11
10K C
R425
TVS_KEC
10K TR_NXP
B ZD404-*1 13
INV_CTL Q402
MMBT3904(NXP)
TR_KEC
E
Q402-*1
2N3904S
C
B
E
+13.2V to +3.5V_STANDBY
+13.2V
L412
BLM18PG121SN1D
C438 C439
10uF 0.1uF
25V 25V
IC405
BD9D321EFJ
R1 R470
10K
EN
R468 R469
1 8
6.8K 68K
1/16W 1/16W
1% 1% FB
2 7
C440
100pF VREG
3 6
50V
SS
3A
4 5
R2
R471 C441 C442
22K
1uF 2200pF
1/16W 10V 50V
1%
Vout=0.765*(1+R1/R2)
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright © 2015 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
+13.2V POWER_DET
+13.2V
R430
14K
1%
C415 R431
5.6K
0.1uF
1%
25V
PWM1
OPT
R467 +13.2V A13.2V
1K
PDIM#2
2
D13.2V
4 L403
D13.2V MLB-201209-0120P-N2
6
A13.2V OPT
8 C402
C433
GND OPT 0.1uF
10
L414 4.7uF
25V
PDIM#1
12 50V
L415
MLB-201209-0120P-N2
PWM_DIM C446
0.1uF
R424 25V
3.9K
+3.5V_Normal to +1.5V_DDR
+3.3V_Normal
+3.5V_ST
IC404
L409
AZ1117EH-ADJTRG1
BLM18PG121SN1D
IN
ADJ/GND
C426
10uF
10V
1.3A
TVS_SEMTECH
ZD405
[EP] 5V
VIN Vout=1.25*(1+R2/R1)+Iadj*R2
C443
TVS_KEC
0.1uF
ZD405-*1
16V
BOOT
L413
2uH
SW
C444 C445
GND
22uF 22uF
10V 10V
+13.2V to PANEL_VCC
R435
+3.5V_ST +13.2V
100K
RESET_IC_KEC OPT
IC401
R438
KIC7529M2 4.7K L408
UBW2012-121F
R454
120OHM
100
VCC OUT
3 2
POWER_DET
1 OPT
C422
C425
GND 0.1uF
0.1uF
16V
25V
POWER_DET_RESET
IC401-*1
RESET_IC_DIODES
APX803E29
VCC RESET
3 2 PANEL_CTL
1
R441
GND 10K
+5V_Normal & +1.10V_VDDC
+1.5V_DDR
L411
CB2012PK501T
OUT
R449 OPT
R453 ZD403
R1
1K 0 2.5V
ZD406
1/16W
5.1v
1%
C431
10uF
R450 10V
200
R2
1/16W
1%
+3.3V_Normal
4700pF
Check the pull down
when AC Power On with HDD
+3.5V_ST to +3.3V_Normal
PANEL_VCC
Q405
SSM3J332R
NON_60_SHARP
R451 R452
R445 C427
5.6K 5.6K
33K 0.22uF
25V
60_SHARP
R446 C427-*1
120K 0.1uF
50V
C
R442 C
TR_NXP
TR_KEC
10K
B Q403
B Q403-*1
MMBT3904(NXP)
2N3904S
E
E
POWER_ON/OFF_1
+13.2V
L404
CB2012PK501T
C405 C406
C407
10uF 10uF 1uF
25V
25V 10V
OPT
C408
+3.3V_Normal
2200pF
50V
OPT
R403 R405 SS2
C409 1
10K 10K
2200pF
THERMAL
50V EN1
25
2
EN2
3 IC400
R409
91K
OPT OPT OPT OPT ROSC/SYNC SNXXXXX
4
C403 R473 C404 R474
+3.3V_Normal
30K 4700pF 30K SW_EN
5
50V 50V OPT
R407 NFAULT
4.7K 6
USB1_CTL
+5V_Normal
USB1_CTL_Pull_Down
R472
3.3K
R408
100K
USB1_OCD
+5V_USB
FET_AOS
Q406-*1
AO3435
+3.5V_ST +3.3V_Normal
FET_TOSHIBA
Q406
L410
SSM3J332R
BLM18PG121SN1D
C428 C429 C430
R443 R447
ZD402
2.2uF 0.1uF 22uF
10K 22K
5V
10V 16V 10V
TVS_SEMTECH
R448 TVS_KEC
2.2K
ZD402-*1
C
C
R444
TR_NXP
TR_KEC
10K
B Q404
B Q404-*1
MMBT3904(NXP)
2N3904S
E
E
Vout=0.6(R1/R2)+0.6
+1.10V_VDDC
L405
4.7uH
R1
OPT
OPT
C411 OPT C412 C413 C414
R411
82pF ZD407 ZD401 10uF 22uF 22uF
4.7K
5.1v
2.5V
1% 50V 6.3V 10V 10V
R2
R413
5.1K
1%
C416
22pF
50V
C417
R414 3300pF
10K 50V
COMP1 R415
18 0
5%
FB1
17
R2
AGND R416
5.1K
16
R422
15K 1%
RSET
15
FB2
C419
14
22pF
50V
COMP2
R417
13
C418
39K
47pF
C420
1%
R418 3300pF 50V
20K 50V
R1 +5V_Normal
C421 L406
0.047uF
4.7uH
25V
C423 C424
22uF 22uF
+5V_Normal
16V 16V
C432
Vout=0.6(R1/R2)+0.6
1uF
16V
L14_CA 140826
POWER 4
LGE Internal Use Only