42GA6400-UD (CHASSIS:LA37G) - LG TV Service Manual (repair manual). Page 26

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THERMAL
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.
@netLa
C2313
10uF
10V
C2315
0.1uF
16V
C2302
4.7uF
16V
+12V
+0.9V_VDD
C2348
4700pF
50V
POWER_ON/OFF2_3
R2342
330K
1/16W
5%
R2305
10K
IC2307
NCP803SN293
1
GND
3
VCC
2
RESET
PANEL_VCC
C2365
0.1uF
16V
L2317
1uH
L2310
BLM18PG121SN1D
+5V_NORMAL
RL_ON
INV_CTL
C2339
1uF
25V
OPT
+3.5V_ST
C2343
22uF
10V
+3.3V_NORMAL
+1.5V_DDR
C2360
0.1uF
16V
PD_24V
C2327
0.1uF
16V
PWM_DIM2
R2311
10K
1%
C2301
4.7uF
10V
C2349
0.1uF
16V
PANEL_CTL
R2340
15K
1/16W
5%
R2341
10K
L2306
BLM18PG121SN1D
+3.5V_ST
+24V
C2363
22uF
10V
+3.3V_NORMAL
R2350
56K
1/16W
1%
L2308
C2306
0.1uF
50V
L2301
BLM18PG121SN1D
C2330
4700pF
50V
R2349
47K
1%
IC2308
NCP803SN293
PD_24V
1
GND
3
VCC
2
RESET
C2336
1uF
10V
C2374
22000pF
50V
R2372
100K
PD_24V
R2376
10K
OPT
R2300
10K
C2317
0.1uF
50V
R2373
100K
C2373
47pF
50V
R2312
100
C2350
22uF
10V
2200pF
C2308
50V
+12V
R2334
10K
3.3V_EMMC
C2340
10uF
10V
+3.5V_ST
+1.8V_NORMAL
+1.8V_NORMAL
L2319
BLM18PG121SN1D
+2.5V_NORMAL
POWER_ON/OFF2_2
R2321
3.9K
1/16W
1%
EMMC_VCCQ
PWM_DIM
C2347
10uF
16V
C2370
10uF
10V
OPT
C2371
0.1uF
16V
R2314
3K
1%
C2346
0.1uF
50V
L2302
CIS21J121
L2311
CIS21J121
POWER_ON/OFF2_1
L2312
3.6uH
NR8040T3R6N
C2307
0.1uF
16V
Q2304
MMBT3904(NXP)
E
B
C
R2357
1K
C2344
0.1uF
16V
C2341
0.1uF
16V
C2345
0.1uF
16V
R2381
0
1/16W
5%
C2332
10uF
16V
Q2301
MMBT3906(NXP) 
1
2
3
POWER_DET
C2359
0.1uF
16V
C2337
22uF
10V
R2308
56K
1%
L2315
+0.9V_VDD
R2347
4.3K
1%
R2306
10K
+24V
POWER_ON/OFF2_3
C2320
10uF
10V
C2322
10uF
16V
2200pF
C2331
50V
C2326
0.01uF
50V
IC2304
TPS54327DDAR
3
VREG5
2
VFB
4
SS
1
EN
5
GND
6
SW
7
VBST
8
VIN
9
[EP]GND
+3.5V_ST
Q2305
AO3407A
G
D
S
R2348
10K
OPT
POWER_ON/OFF1
R2339
10K
R2330
1K
+3.5V_ST
C2372
0.1uF
16V
L2303
BLM18SG121TN1D 
L2305
CIS21J121
C2334
100pF
50V
C2328
0.1uF
50V
+3.5V_ST
C2325
0.1uF
16V
C2338
100pF
50V
+12V
R2366
0
5%
PD_+3.5V
R2377
100K
1/16W
5%
C2335
0.1uF
50V
OPT
+12V
C2375
180pF
50V
R2315
100
1%
C2329
0.01uF
50V
+12V
+5V_NORMAL
C2333
22uF
10V
R2346
2K
1%
10uF
C2324
10V
C2342
2200pF
50V
L2313
6.8uH
NR8040T4R7N
R2362
2.7K
1%
PD_+12V
R2363
1.2K
1%
PD_+12V
R2364
8.2K
1%
PD_24V
R2365
1.5K
1%
PD_24V
+3.3V_NORMAL
IC2300
AP7173-SPG-13 HF(DIODES)
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
IC2303
AP7173-SPG-13 HF(DIODES)
3
VCC
2
PG
4
EN
1
IN
5
GND
6
SS
7
FB
8
OUT
9
[EP]
IC2302
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]
R2378
6.8K
1/16W
1%
FRC3
IC2305
EAN62348501
3
GND_2
2
GND_1
4
PVIN_1
1
RT/CLK
6
VIN
5
PVIN_2
7
VSENSE
8
COMP
9
SS/TR
10
EN
11
PH_1
12
PH_2
13
BOOT
14
PWRGD
15
[EP]GND
R2343
33K
R2344 5.6K
R2307
1.3K
R2301
10K
POWER_ON/OFF1
R2379
12K
1/16W
1%
FRC3
R2378-*1
8.2K
1/16W
1%
URSA5
R2379-*1
15K
1/16W
1%
URSA5
C2376
22uF
10V
SAMSUNG_eMMC
P2300
SMAW200-H18S1
POWER_18P
14
12V
9
24V
4
PDIM#1
18
GND
13
12V
8
GND
3
3.5V
17
GND
12
GND
7
GND
2
INV ON
16
24V
11
GND
6
PDIM#2
1
PWR ON
15
12V
10
24V
5
3.5V
19
C2312
10uF
10V
C2309
0.1uF
16V
OPT
L2300
BLM18PG121SN1D
IC2301
BD86106EFJ 
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SW_1
8
SW_2
9
[EP]
+12V
C2310
0.1uF
16V
C2314
10uF
10V
C2304
10uF
16V
C2323
10uF
10V
R2303
10K
R2302
6.8K
C2300
10uF
16V
C2351
47pF
50V
OPT
C2316
10uF
10V
C2311
0.0068uF
50V
L2304
2uH
+3.3V_NORMAL
POWER_ON/OFF2_1
R2317
10K
1%
R2316
30K
1/16W
1%
L2314
BLM18PG121SN1D
+3.3V_TU_IN
+3.3V_TU
R2304
2K
1%
P2301
SMAW200-H24S2
POWER_24P
19
GND
14
 
9
 
4
 
18
 
13
 
8
 
3
 
17
 
12
 
7
 
2
 
16
 
11
 
6
 
1
 
20
GND
15
 
10
 
5
 
21
GND
22
L/DIMO_VS
23
L/DIM0_MOSI
24
L/DIM0_SCLK
25
 
L/DIM0_MOSI
L/DIM0_SCLK
L/DIM0_VS
R2368
33
G3S
R2369
33
G3S
R2367
33
G3S
C2352
10uF
10V
IC2306
BD86106EFJ 
3
AGND
2
VIN
4
FB
1
PGND
5
COMP
6
EN
7
SW_1
8
SW_2
9
[EP]
C2319
0.1uF
16V
C2318
0.1uF
16V
OPT
C2354
10uF
10V
R2310
10K
R2309
6.8K
C2355
10uF
10V
C2353
10uF
10V
C2305
10uF
16V
L2307
BLM18PG121SN1D
L2309
2uH
C2303
10uF
16V
C2321
0.0068uF
50V
+12V
C2356
47pF
50V
OPT
R2313
2.7K
1/16W
1%
POWER_ON/OFF2_3
R2318
7.5K
5%
+1.0V_VDD
POWER
LG1152
3A
R2
2
Switching freq: 700K
R1
R2
4
R1
Vout=0.827*(1+R1/R2)=1.521V
3A
1.5A
R2
4
R2
Max 5926 mA
Vout=0.765*(1+R1/R2)
R2
1074 mA
not to RESET at 8kV ESD
+2.5V
1
PANEL_POWER
eMMC POWER
293 mA
$ 0.145
MAX 1A
R1
 700 mA
Vout=0.8*(1+R1/R2)
3. soft start
R1
R1
ST_3.5V-->3.5V
Switching freq: 400 ~ 580 Khz
TYP 1450mA
+5V_Normal
24V-->3.48V
Vout=0.6*(1+R1/R2)
+1.8V
1
3A
DDR MAIN 1.5V
1.5A
MAX   4.7 A
12V-->3.58V
Power_DET
4
+3.3V_NORMAL
Vout=0.8*(1+R1/R2)
6A
Vout=0.8*(1+R1/R2)
R1
Placed on SMD-TOP
R2
Vout=0.8*(1+R1/R2)
LG1152 Max: 1728 mA
+1.0V_VDD
LG1132 Max: 2000 mA
Placed on SMD-TOP
R1
R2
6A
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