Read LG 42SL90-UA (CHASSIS:LA92S) 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.
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.
POWER
4 10
SL90
09/06/24
+5V_GENERAL
R405
75K
75K
1/8W
1%
R407
12K
1%
C455
22uF
16V
Q400
1
2
3
+12V
R438
56K
1/10W
1%
1/10W
1%
IC404
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
PWM_DIM
006:AF11;008:AK16
R473
100
OPT
R425
0
R452
100K
5%
R444
10
1/10W
1%
R430
0
C459
10uF
10uF
10V
+3.3V_AVDD_MPLL
C475
10uF
10uF
6.3V
L404
BG2012B080TF
+3.3V_MEMC
22uF
C400
16V
R409
10
1/10W
1%
R458
27K
1/10W
1%
L402
MLB-201209-0120P-N2
IC406
AP1117E33G-13
2
OUT
3
IN
1
ADJ/GND
R446
10K
OPT
L411
CB3216PA501E
R416
0
OPT
C429
22uF
16V
L420
CB3216PA501E
C405
0.1uF
50V
GND
Q403
2SC3875S(ALY)
OPT
E
B
C
R460
390K
1/8W
1%
1/8W
1%
L422
3.6uH
NR8040T3R6N
L408
BLM18PG121SN1D
R470
10
1/10W
1%
C408
47uF
25V
+3.3V_ST
R402
0
Without OPC
C426
0.1uF
16V
OPT
+24V
C432
22uF
22uF
16V
C423
0.1uF
16V
OPT
POWER_EN
Q407
2SC3052
2SC3052
E
B
C
OPC_OUT1
008:AK16
+5V_GENERAL
Q404
2SC3052
OPT
E
B
C
R412
0
L410
BLM18PG121SN1D
C477
0.1uF
16V
0.1uF
16V
C448
10uF
10uF
6.3V
R423
10K
OPT
L400
0.1uF
C416
16V
OPT
R422
10K
10K
R454
47K
+1.26V_MEMC
R440
10K
10K
OPT
L414
BLM18PG121SN1D
OPT
+12V
R404
22K
1/10W
1%
R434
0
C468
10uF
10V
10uF
10V
R426
10K
10K
C419
0.1uF
16V
0.1uF
16V
R451
22K
C478
0.1uF
16V
0.1uF
16V
C424
0.1uF
50V
R474
2K
C461
22uF
16V
16V
C415
0.1uF
50V
0.1uF
50V
OPT
D401
100V
1N4148W_DIODES
OPT
C425
68uF
35V
35V
C433
10uF
10uF
6.3V
+5V_ST
+3.3V_ST
GND
C464
22uF
25V
25V
R443
10
C402
10uF
10uF
10V
GND
GND
RL_ON
006:AS32;006:AV31
C422
0.1uF
50V
PANEL_CTL
006:AS31
A_DIM
006:AF11
L412
3.6uH
NR8040T3R6N
ERROR_OUT
006:AB20
+5V_GENERAL
R465
0
IC405
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
L419
C454
0.1uF
16V
0.1uF
16V
+5V_EXT
22uF
C404
16V
C473
0.1uF
50V
D402
100V
1N4148W_DIODES
OPT
C457
22uF
OPT
L416
CB3216PA501E
D403
100V
1N4148W_DIODES
OPT
+5V_GENERAL
IC400
SC4215ISTRT
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
Q406
2SC3052
E
B
C
R450
560
R469
10
C450
0.1uF
POWER_ON/OFF
006:AV31
POWER_ON_DELAY
L409
CB3216PA501E
C479
0.1uF
16V
0.1uF
16V
R471
100
OPT
L415
BLM18PG121SN1D
0.1uF
C431
C421
15pF
15pF
50V
C411
22uF
+1.8V_MEMC
C458
10uF
C445
10uF
OPT
C412
100uF
16V
P400
FM20020-24
19
NC
14
12V
9
5.2V
4
GND
18
24V
13
12V
8
5.2V
3
GND
17
12
GND
7
5.2V
2
PWR ON
16
GND
11
GND
6
GND
1
NC
20
15
GND
10
5.2V
5
GND
21
22
23
NC
24
PWM_DIM
25
R424
10K
OPT
C436
1uF
16V
16V
+3.3V_FE
C460
10uF
10uF
10V
IC403
APE8953MP
3
VOUT_1
2
FB
4
VOUT_2
1
GND
5
VIN
6
VCNTL
7
POK
8
EN
C407
100uF
16V
C437
OPT
4.7K
R427
L405
+3.3V
R456
30K
1/10W
1%
C406
0.47uF
0.47uF
16V
OPT
C470
0.1uF
16V
0.1uF
16V
+3.3V_ST
C471
1uF
10V
C442
4.7uF
25V
25V
IC402
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
+3.3V
C447
10uF
6.3V
L418
CB3216PA501E
C428
22uF
22uF
16V
C420
1uF
16V
R439
18K
18K
1/10W
1%
R400
3.3K
3.3K
C401
22uF
22uF
16V
OPT
L423
BLM18PG121SN1D
R429
10K
10K
OPT
GND
C413
0.1uF
50V
0.1uF
50V
OPT
C451
22uF
16V
C439
4.7uF
6.3V
OPT
C430
1uF
35V
35V
C472
22uF
22uF
16V
R445
10K
10K
OPT
C417
22uF
22uF
OPT
R413
10K
1/10W
GND
R401
4.7K
4.7K
R463
10
1/10W
1%
POWER_EN
006:AR30;004:AL8;004:AN20;005:AG7
L406
3.6uH
NR8040T3R6N
R403
0
OPC(V4)
L417
CB3216PA501E
R464
10K
1/10W
R442
0
R415
6.8K
OPT
C444
0.01uF
25V
+5V_ST
R435
10K
R421
20K
R428
120K
OPT
L403
BG2012B080TF
+5V_ST
L421
CB3216PA501E
R436
120K
OPT
R447
22K
IC401
MP2212DN
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
22uF
C474
16V
+3.3V
0.1uF
C414
16V
OPT
R432
10K
OPT
+5V_EXT
R433
0
C469
0.1uF
16V
0.1uF
16V
C476
22uF
16V
22uF
16V
3225
C409
1uF
25V
25V
C453
0.1uF
16V
0.1uF
16V
+5V
+3.3V_ST
R468
10K
POWER_EN
006:AR30;004:X20;004:AL8;005:AG7
C434
22uF
OPT
+5V_GENERAL
R417
33K
OPT
+5V_GENERAL
L401
CB3216PA501E
C446
10uF
10uF
6.3V
R414
100
C449
0.1uF
0.1uF
12V_TCON
C403
0.1uF
16V
0.1uF
16V
C456
1uF
25V
1uF
25V
+1.8V_DDR
R431
0
+3.3V_ST
C440
1uF
10V
R455
47K
Q405
2SC3052
2SC3052
E
B
C
R462
10
+3.3V_ST
R408
10
GND
L413
BLM18PG121SN1D
INV_CTL
006:AS32
+5V_ST
+5V_ST
R472
10K
OPT
C443
1uF
10V
10V
C465
22uF
16V
OPT
Q402
2SC3052
OPT
E
B
C
R461
300K
300K
1/8W
1%
C452
22uF
22uF
C441
0.1uF
50V
R418
3.3K
3.3K
C435
10uF
10uF
6.3V
R406
9.1K
9.1K
1%
R420
0
+12V
C466
1uF
16V
C410
1uF
50V
50V
OPT
C463
0.1uF
16V
0.1uF
16V
R453
100
OPT
D400
100V
1N4148W_DIODES
OPT
C467
0.1uF
50V
+5V
L424
3.6uH
NR8040T3R6N
R437
10K
+5V_ST
Q401
2SC3052
E
B
C
+1.8V_MEMC
R448
1K
R419
0
OPT
+12V
R411
24K
1/8W
1%
C427
68uF
35V
35V
R441
10K
10K
C462
0.1uF
16V
0.1uF
16V
R449
10K
Q408
SI4925BDY
3
S2
2
G1
4
G2
1
S1
5
D2_1
6
D2_2
7
D1_1
8
D1_2
C418
22uF
22uF
16V
+1.26V_VDDC
C438
4.7uF
6.3V
OPT
R410
10K
1/10W
OPT
R459
33K
1/10W
1%
OPC_OUT2
008:AK17
008:AK17
R457
82K
R467
13K
13K
1%
L407
R466
68K
1%
C480
560pF
50V
OPT
C482
560pF
50V
OPT
C483
100pF
50V
C481
390pF
50V
Close to IC
R1
$0.07
24V
Vout=0.8*(1+R1/R2)
C OUT
Close to IC
220uF ==> 100uF*2 + 22uF for Depth
A.DIM
C IN
Placed on SMD-TOP
Vout=0.8*(1+R1/R2)
Close to IC
Close to IC
R2
FROM LIPS & POWER B/D
R1
C IN
R2
$0.07
Placed on SMD-TOP
450 mA
+1.8V_MEMC for URSA DDR
PI Result
415 mA @85% efficiency
Vout=0.8*(1+R1/R2)
Close to IC
R1
+5V_EXT
$0.24
Placed on SMD-TOP
+3.3V
INV ON
+1.8V for Saturn5 DDR
Close to IC
R1/R2 : 27K / 20K => Vout=1.88
R2
400 mA + 600 mA
Placed on SMD-TOP
R1/R2 : 12K / 9.1K => Vout=1.85
Placed on SMD-TOP
Placed on SMD-TOP
R2
R1/R2 : 15K / 12K => Vout=1.80
C OUT
R1/R2 = 12K/20K => Vout=1.28
4.9A 0.0150OHM 34MHZ
MAX 3A
+1.26 Core for Saturn5
+1.26 Core for URSA
About 1.84V
R1
Stand-by +3.3V
R1
4.9A 0.0150OHM 34MHZ
Placed on SMD-TOP
R2
Vout=0.8*(1+R1/R2)
3A, DCR=0.025 ohm
+5V_+12V
Placed on SMD-TOP
Placed on SMD-TOP
Close to IC
Err OUT
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