LG 50LN54 Series Service Manual page 22

L13 POWER BLOCK (POWER DETECT 2)
FROM LIPS & POWER B/D
+3.5V_ST
MMBT3906(NXP)
Q402
+3.5V_ST
1 3
R416
2
10K OPT
R411
33K
R406
R461
OPT 4.7K
10K
R401 C
RL_ON 10K
B Q401
MMBT3904(NXP)
R462
E
10K
P401
SMAW200-H18S1
D401 5V OPT
CIC21J501NE
PWR ON
1
L408 L404
3.5V
+3.5V_ST 3
3.5V
C406 0.1uF CIC21J501NE 5
GND
16V 7
L407
24V
+24V 9
GND
C418 0.1uF 11
MLB-201209-0120P-N2
12V
50V 13
L402
12V
+12V 15
GND
C404 0.1uF 17
MLB-201209-0120P-N2
16V
+5V_Normal
Vout=0.8*(1+R1/R2)
&
L406
3.6uH
+5V_USB
C413
C420
0.047uF
22uF
25V
16V
R491
0
+12V
CHANGE TO
16V/X5R
L401
CIC21J501NE
C405
PGND
10uF
16V
IC401
VIN
TPS65281RGV
C419
4.7uF 10V
R410
100K
V7V
EN
[EP]
R413
R409 20K
C426 2K
100pF
50V
C410
OPT
3300pF
50V
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.
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
PANEL_POWER
+3.3V_Normal
+3.5V_ST
R419
1K
R415
100 R426
10K
C
R421
INV_CTL
10K
B
E
Q405
MMBT3904(NXP)
+1.5V_DDR
R412 3.9K
PWM_DIM_PULL_DOWN
*For 55LN54 Power ON Noise
DRV ON
2
PDIM#1
4
PWM_DIM
PDIM#2 R408 100
6
PWM1
GND
8
PWM2_2CH_POWER
24V
10
GND
12
12V
14
N.C
16
GND
18
19
10uF
+2.5V_Normal
+5V_Normal
R1
R452
C421 33K
22uF
1% C422
C424
16V
330pF 0.1uF
R453
OPT
50V
27K 16V
OPT
1% R2
R454
11K 1%
+5V_USB
C417
CAP_10uF_X5R
CHANGE TO
10uF
10V
10UF/10V/X5R
85C
+5V_Normal +3.3V_Normal
SW_OUT
R417
AGND
R414
10K 4.7K
OPT
USB1_OCD
FAULT
USB1_CTL
EN_SW
C417-*1
10uF 10V
CAP_10uF_X7R
+12V
L412
Q409
120
CIS21J121 AO3407A
C443
R439
10uF
C438
33K
16V G
0.1uF
25V
OPT
R440
5.6K
C
R430
10K B Q407
PANEL_CTL
MMBT3904(NXP)
001:AL22
E
R489
10K
+3.5V_ST
IC407
AP7173-SPG-13 HF(DIODES)
L420 [EP]
BLM18PG121SN1D
IN OUT
1 8
R1
R457
PG FB
4.3K
2 7
1/16W
1%
VCC SS
3 6
1.5A
+3.3V_Normal R2
R433
EN GND C467 R456
10K
4.7K
4 5
560pF
1/16W
50V
1%
C461
10V
Vout=0.8*(1+R1/R2)=1.5319
IC402 +2.5V_Normal
+3.3V_Normal
TJ1118S-2.5
IN OUT
3 2
1
GND
C440 D402
C403
CAP_10uF_X5R
10uF 0.1uF 5V
10V
16V
OPT
85C
CHANGE TO
10UF/10V/X5R
C403-*1
10uF 10V
CAP_10uF_X7R
Power_DET
+12V
PD_+12V
R448
PANEL_VCC
2.7K
1%
PD_+12V
R447
C411
1.2K
0.1uF
1%
16V
R405 R407
5.6K 5.6K
+24V
PD_+24V
R482
8.2K
1%
PD_+24V
R403
PD_+24V 1.5K
C412
1%
0.1uF
16V
+1.5V_DDR
+3.3V_Normal
C472
C476 D403
22uF
0.1uF 5V
OPT
10V 16V
POWER_ON/OFF_1
S7LR core 1.15V volt
+3.3V_Normal
R428
10K
+3.5V_ST
L413
CIC21J501NE
VIN_1
1
THERMAL
VIN_2
2
C430
10uF
GND_1
10V 3
TPS54319TRE
GND_2
4
Vout=0.827*(1+R1/R2)
+3.5V_ST --> 3.375V --> 3.46V
+24V --> 3.78V --> 3.92V (3.79V)
+12V --> 3.58V --> 3.82V (3.68V)
R402-*1
100
+3.5V_SOC_RESET
+3.5V_ST
+3.5V_ST
R488
100K
PD_+3.5V R463 RESET_IC_SOC_RESET
10K
R450
0
PWR_DET_ON_SEMI
IC408
5%
NCP803SN293 RESET_IC_SOC_RESET
R402
POWER_DET
VCC RESET 300
3 2
1
C474
GND
0.1uF
POWER_DET_RESET IC408-*1
APX803D29
PD_+24V
R404
RESET
100K
2 3
1
PD_+24V_PWR_DET_ON_SEMI
GND
IC409
NCP803SN293
PD_+24V PWR_DET_ON_DIODES
R480
100
VCC RESET
3 2 IC409-*1
1 APX803D29
GND
RESET
2 3
1
GND
PD_+24V_PWR_DET_DIODES
+3.5V_ST
FET_2.5V_AOS +3.3V_Normal
AO3435
L403
Q403
BLM18PG121SN1D
C437 D405
C425
C423
0.1uF 22uF 5V
R434 R438
2.2uF 16V
10K 10V
22K
10V
R445
2.2K
FET_2.5V_DIODE
DMP2130L
C
R443 Q403-*1
10K B Q400
MMBT3904(NXP)
E
C447
0.33uF
16V
C441 +1.10V_VDDC
0.1uF
16V
L415
3.6uH
PH_3
12
PH_2
11
17 D404
C444
C453 C456
0.1uF 5V
PH_1
IC403 10 22uF 22uF
16V
OPT
10V 10V
SS/TR
9
C488
C439
3300pF
50V
R1
R432 R442 100pF
1/16W 330K 5% 30K
1/16W
1%
R436 C448
15K 3300pF
50V
R2
R441
75K
3A
1/16W
1%
NC4_S7LRM 2012/09/19
Power_PD2 4
LGE Internal Use Only
VCC
VCC