LG 55LA7400 Service Manual page 28

FROM LPB & PSU
+3.5V_ST
MMBT3906(NXP)
Q2401
R2408
1 3
RL_ON 10K
2
R2401
10K
+3.5V_ST
L2402
PWR ON
CIS21J121
3.5V
3.5V
C2406
GND
0.1uF
16V 24V
GND
12V
12V
+12V
L2401
GND
CIS21J121
GND
GND
C2401
0.1uF L/DIM0_MOSI
L/DIM0_MOSI_PWR
50V
IC2401-*1
NCP803SN293
VCC RESET
3 2
P_DET_BOTH_12_24V
1
GND
P_DET_BOTH_24_3.5V
R2410-*1 P_DET_BOTH_12_24V
P_DET_BOTH_12_3.5V
2.7K R2418-*1
1% 100
P_DET_BOTH_12_24V
P_DET_BOTH_12_3.5V C2410-*1
P_DET_BOTH_24_3.5V
R2409-*1
0.1uF
1.2K R2416-*1
50V P_DET_BOTH_12_24V
1% 100K
P_DET_BOTH_24_3.5V
P_DET_BOTH_24_3.5V
Power_DET
+12V +3.5V_ST
P_DET_ONLY_12V
R2410 R2413
0
2.7K
1% 5% NCP803SN293
P_DET_BOTH_24_3.5V
VCC
3
C2411
P_DET_ONLY_12V
0.1uF
R2409
16V
1.2K
1%
P_DET_BOTH_12_3.5V
+3.5V_ST
+24V
On-semi
R2400
R2412 0
8.2K
P_DET_BOTH_12_3.5V NCP803SN293
P_DET_BOTH_24_3.5V
VCC
3
R2411
C2410
1.5K
1% 0.1uF
50V
P_DET_BOTH_24_3.5V
P_DET_BOTH_12_3.5V
+12V
L2404
L2400
IC2400 2uH
BD86106EFJ
BLM18PG121SN1D [EP]
PGND SW_2
1 8
C2407
Placed on SMD-TOP 10uF
VIN SW_1
2 7
10V
C2405
AGND EN 0.0068uF
3 6
C2400 C2402 C2403 R2402
50V
10uF 10uF 0.1uF 6.8K
FB 6A COMP
16V 16V 16V
4 5
OPT
R2403
POWER_ON/OFF1
10K
C2404
0.1uF
16V
Vout=0.8*(1+R1/R2)
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 right reserved.
Only for training and service purposes
P2400
SMAW200-H24S2 +3.3V_NORMAL
R2426
POWER_18P
1K
R2425
100 INV_CTL
INV ON
1 1 2 2
L/DIM0_SCLK
PDIM#1
3 3 4 4 PWM_DIM1
PDIM#2
5 5 6 6
PWM_DIM2 +24V
L2403
GND
7 7 8 8 CIS21J121
L/DIM0_MOSI
24V
9 9 10 10
GND
11 11 12 12
C2413
12V
13 13 14 14 0.1uF L/DIM0_VS
24V 50V
15 15 16 16
GND
17 17 18 18
GND
19 20
L/DIMO_VS
21 22
19 L/DIM0_VS_PWR
L/DIM0_SCLK
23 24
L/DIM0_SCLK_PWR
POWER_24P
25
SMAW200-H18S1
P2401
R2412-*1
8.2K
IC2401-*2
NCP803SN293
R2411-*1
P_DET_BOTH_12_24V C2410-*2
1.5K
1% R2416-*2 0.1uF
VCC RESET
100K 3 2
50V
P_DET_BOTH_12_24V
R2410-*2 1
2.7K
R2418-*2 GND
1% P_DET_BOTH_12_24V
100
R2409-*2 P_DET_BOTH_12_24V
1.2K
1%
R2417
+3.5V_ST
100K
R2421
10K
IC2402
OPT
R2419
POWER_DET
RESET 100
2
1
GND
C2412
0.1uF
16V
R2416
100K
not to RESET at 8kV ESD
IC2401
R2418
RESET 100
2
1 P_DET_BOTH_12_3.5V
24V-->3.48V
GND
12V-->3.58V
P_DET_BOTH_12_3.5V
ST_3.5V-->3.5V
DDR MAIN 1.5V
+3.5V_ST
+1.2V_MTK_CORE
C2408 C2409 C2414 C2441
10uF 10uF 10uF 47pF
10V 10V 10V 50V C2448
OPT
10uF
10V
R1
R2
HDMI LEAKAGE Workaround in MTK A2(A0) (Default= with HDMI_LEAKAGE)
+3.3V_NORMAL
R2454
0 OPT
1/16W
5%
PANEL_VCC
L/DIM_OUT
R2459
33
R2453
L/DIM0_SCLK_PWR
10K
L/DIM_OUT
R2458
33
L/DIM0_MOSI_PWR
L/DIM_OUT
R2456
33
L/DIM0_VS_PWR
NTR4501NT1G
Q2408
+5V_Normal
IC2404
RT8289GSP
[EP]GND
C2423
0.01uF
L2407
50V
4.7uH
BOOT SW
1 8
NC_1 VIN
2 7
NC_2 GND
+24V
3 6
FB 5A EN
L2406 4 5
BLM18PG121SN1D
C2417
C2422
10uF
0.1uF
35V 50V
1%
51K
R1
R2438
R2
C2424
150pF
50V
Vout=1.222*(1+R1/R2)
DDR MAIN 1.5V
POWER_ON/OFF2_1
C2420
0.1uF
16V C2455
0.1uF
16V
L2405
BLM18PG121SN1D
L2411
VIN_1 2.2uH
PH_3
1 12
THERMAL
VIN_2 PH_2
2 17 11
NR5040T2R2N
GND_1 3 10 PH_1
C2418 C2419 3A
IC2403
10uF 0.1uF GND_2 TPS54319TRE SS/TR C2456 C2451 C2454 C2447
4 9
10uF 10uF 10uF 10uF
10V 16V
C2450 10V 10V 10V 10V
0.01uF
50V
R2432
1/16W 330K 5%
C2421
R2431
4700pF
15K
1/16W 5%
50V
3A
Vout=0.827*(1+R1/R2)=1.521V
+12V
PANEL_POWER
L2408
BLM18SG121TN1D
C2433
C2432
0.1uF
0.01uF
50V
50V
VDD3V3_HDMI
C2453
PANEL_CTL
0.1uF
16V
+5V_NORMAL
125C 125C
C2426 C2429
C2425
C2428
22uF 0.1uF
22uF
10uF
16V
10V 10V
10V
POWER_ON/OFF2_3
R2439
10K
C2427
0.1uF
16V
+3.3V_NORMAL
+12V
+1.5V_DDR
L2409 IC2405
TPS54327DDAR [EP]GND
BLM18PG121SN1D
EN VIN
1 8
0.1uF
C2437
Placed on SMD-TOP
VFB VBST
2 7
VREG5 SW
3 6
C2430 C2431 C2434
10uF 10uF 0.1uF
SS GND
C2457 16V 16V 16V 4 5
OPT
0.1uF
16V
C2452
100pF R2414
R1
POWER_ON/OFF2_2
10K C2436 C2415 C2416
50V
0.1uF 1uF 3300pF
10V 50V
16V
R2433
56K R2
1/16W Vout=0.765*(1+R1/R2)
1%
TYP 1450mA
PANEL_VCC
Q2407
AO3407A
G
C2435 C2440
4.7uF 1uF
25V
50V
C2443
OPT
0.1uF
50V
C
R2437
10K
B Q2406
MMBT3904(NXP)
E
POWER_ON/OFF1
POWER_ON/OFF2_1
POWER_ON/OFF2_2
POWER_ON/OFF2_3
POWER_ON/OFF2_4
+3.3V_NORMAL
MAX 3.4 A
L2410
2uH
NR8040T2R0N
16V
C2438 C2439 C2442 C2444 C2445
10uF 10uF 10uF 10uF 100pF
10V 10V 10V 10V 50V
OPT R1
R2
2011.11.25
MID_POWER
24
LGE Internal Use Only