Read LG 37LH40 / 37LH41 (CHASSIS:LA92G) 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.
68uF
35V
C721
10uF
6.3V
C751
10uF
6.3V
C754
82K
R741
1/10W
2K
5%
R1508
0.01uF
25V
C779
10K
R702
OPT
22uF
16V
OPT
C731
1/10W
10
1%
R724
10uF
6.3V
C708
47K
R739
+24V
CB3216PA501E
L724
560
R730
0.1uF
16V
C758
APE8953MP
IC708
3
VOUT_1
2
FB
4
VOUT_2
1
GND
5
VIN
6
VCNTL
7
POK
8
EN
22uF
C763
1/10W
10
1%
R734
0.1uF
50V
OPT
C720
10K
R720
+12V
1N4148W_DIODES
100V
D700
OPT
10K
R726
68K
R746
4.7uF
6.3V
OPT
C762
+1.26V_VDDC
+5V
10uF
C742
OPT
3.3K
R710
0.1uF
16V
C713
0.1uF
16V
C715
+3.3V
0.1uF
16V
C705
10K
R733
OPT
BLM18PG121SN1D
L714
0.1uF
16V
C717
CB3216PA501E
L716
10K
OPT
R721
+5V_ST
1/10W
10K
R748
OPT
POWER_EN
1/8W
75K
1%
R722
1/10W
10
1%
R768
33K
R708
OPT
0.1uF
16V
OPT
C709
1/10W
10K
OPT
R731
0.1uF
C749
22uF
C786
0
R743
1/10W
10K
R738
CB3216PA501E
L715
CB3216PA501E
L708
22K
R732
0.1uF
16V
C780
1/10W
10K
R763
+5V_GENERAL
BLM15BD121SN1
L701
RL_ON_BEAD
+3.3V
4.7K
R707
1uF
25V OPT
C725
NR8040T3R6N
3.6uH
L712
0.1uF
16V
C710
22uF
C787
OPT
22uF
25V
C748
6.8K
OPT
R715
FW20020-24S
P700
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
+5V_EXT
NR8040T3R6N
3.6uH
L710
AP1117E33G-13
IC702
2
OUT
3
IN
1
ADJ/GND
0
R775
OPT
10K
OPT
R753
0.1uF
16V
C747
+3.3V_ST
22uF
16V
C714
0.1uF
50V
C735
OPT
+3.3V_ST
POWER_ON_DELAY
1N4148W_DIODES
100V
D701
OPT
MP2212DN
IC707
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
1/10W
33K
1%
R752
BLM18PG121SN1D
L719
NR8040T3R6N
3.6uH
L718
120K
OPT
R701
GND
+3.3V_MEMC
1/10W
30K
1%
R750
+1.8V_DDR
0
OPT
R772
2SC3875S(ALY)
OPT
Q708
E
B
C
POWER_EN
1/8W
390K
1%
R766
POWER_ON/OFF 001:AR31;010:AG9
1/10W
56K
1%
R770
1/8W
24K
1
%
R736
10K
R705
OPT
POWER_ON_DELAY
10uF
6.3V
C778
0.1uF
16V
C774
2SC3052
Q703
E
B
C
22uF
16V
C791
10K
OPT
R747
100K
5%
R774
0.1uF
C793
0.1uF
16V
OPT
C790
22uF
16V
C777
PWM_DIM
001:AF12
0
R713
560pF
50V
C724
OPT
1uF
16V
C770
22uF
16V
C776
100
R714
22uF 16V
C750
0
OPT
R773
10K
R727
2SC3052
Q702
E
B
C
0
R758
RT1P141C-T112
Q701
1
2
3
CB3216PA501E
L725
GND
+3.3V_ST
2SC3052
Q705
E
B
C
+5V_ST
0.1uF
16V
OPT
C707
L728
1/10W
10
1%
R745
2SC3052
OPT
Q707
E
B
C
+5V_GENERAL
CB3216PA501E
L711
+5V_GENERAL
1uF
10V
C734
GND
47uF
25V
C722
1/8W
300K
1%
R767
0
R771
+3.3V_ST
CB4532UK121E
L704
100
R754
OPT
POWER_EN
001:AR30;007:B6;007:T3;007:AG9;007:AM26;007:AO16
100
OPT
R756
1uF
10V
C737
22uF
16V
C792
CB4532UK121E
L706
0.1uF
16V
C753
0
R709
OPT
+5V_ST
3.3K
R717
100
OPT
R716
GND
+5V_ST
SC4215ISTRT
IC701
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
+5V_ST
BLM18PG121SN1D
L717
1uF
16V
C767
CB3216PA501E
L722
10uF
10V
C712
+5V_GENERAL
4.7uF
6.3V
OPT
C761
68uF
35V
C727
0.47uF
16V
OPT
C716
10uF
10V
C757
22uF
C764
OPT
1N4148W_DIODES
100V
OPT
D702
22K
R735
1/10W
10K
R755
12K
1%
R711
OPT
C766
BLM18PG121SN1D
L720
A_DIM 001:AF12
1uF
25V
C755
+1.26V_MEMC
560pF
50V
C781
OPT
+5V_ST
560pF
50V
C785
OPT
POWER_EN
001:AR30;007:B6;007:T18;007:T3;007:AG9;007:AO16
10uF
6.3V
C771
INV_CTL
001:AR31
BLM18PG121SN1D
L727
OPT
1uF
10V
C782
+3.3V_FE
100
OPT
R765
120K
R725
OPT
MP2212DN
IC704
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
+3.3V_ST
22uF 16V
C752
PANEL_CTL
001:AR32
9.1K
1%
R712
10K
R729
+5V
GND
POWER_ON/OFF
001:AR32
10K
R718
BLM18PG121SN1D
L702
BG2012B080TF
L705
GND
+3.3V_AVDD_MPLL
2SC3052
Q700
OPT
E
B
C
1/10W
22K
1%
R723
NR8040T3R6N
3.6uH
L726
22uF
16V
C765
10uF
C756
22uF
16V
C732
+3.3V_ST
560pF
C772
OPT
1uF
16V
C788
GND
1/10W
18K
1%
R769
22uF
16V
OPT
C730
0.1uF
50V
C728
BG2012B080TF
L700
MP2212DN
IC705
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
0
R703
10uF
10V
C704
0.1uF
16V
C760
CB3216PA501E
L709
1uF
25V
C706
MLB-201209-0120P-N2
L707
RL_ON
001:AR32
0.1uF
C746
10K
R719
+1.8V_MEMC
15pF
50V
C711
MP2212DN
IC706
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
4.7K
R704
+5V_GENERAL
1/8W
13K
1%
R762
0.1uF
50V
C719
1N4148W_DIODES
100V
D703
OPT
1K
R744
0
R757
+5V_EXT
+12V
+1.8V_MEMC
2SC3052
Q704
E
B
C
+12V
1uF
35V
C723
0
R764
22uF
16V
C768
OPT
SI4925BDY
Q706
3
S2
2
G1
4
G2
1
S1
5
D2_1
6
D2_2
7
D1_1
8
D1_2
10K
R728
OPT
BLM18PG121SN1D
L703
ERROR_OUT
001:AB20
220uF
16V
C726
VLCD_LCM
10uF
6.3V
C759
1/10W
27K
1%
R751
+3.3V
22uF
C733
OPT
+5V_GENERAL
2.7K
R740
10uF
35V
C740
0
R776
20K
R706
0
L701-*1
RL_ON_0OHM
10
R737
10
R749
10
R759
10
R742
0.1uF
50V
C789
0.1uF
50V
C741
0.1uF
50V
C718
0.1uF
50V
R781
3225
22uF
16V
C773
1.5mA
Vout=0.8*(1+R1/R2)
R1/R2 : 12K / 9.1K => Vout=1.85
465 mA @85% efficiency
Placed on SMD-TOP
+5V_+12V
Err OUT
About 1.84V
Close to IC
R1/R2 : 27K / 20K => Vout=1.88
415 mA @85% efficiency
+1.8V_MEMC for URSA DDR
24V
$0.07
$0.24
C OUT
Close to IC
R1
+5V_EXT
Vout=0.8*(1+R1/R2)
+1.26 Core for URSA
Placed on SMD-TOP
C IN
35V/8.0PI
Placed on SMD-TOP
R1
R2
R2
MAX 3A
C OUT
Vout=0.8*(1+R1/R2)
R1
4.9A 0.0150OHM 34MHZ
Placed on SMD-TOP
Close to IC
C IN
R2
Close to IC
R1
$0.07
Stand-by +3.3V
Close to IC
4.9A 0.0150OHM 34MHZ
+3.3V
Vout=0.8*(1+R1/R2)
+1.8V for Saturn5 DDR
Placed on SMD-TOP
3A, DCR=0.025 ohm
Close to IC
R1/R2 = 12K/20K => Vout=1.28
Placed on SMD-TOP
R2
PI Result
A.DIM
R1/R2 : 15K / 12K => Vout=1.80
Placed on SMD-TOP
INV ON
Close to IC
+1.26 Core for Saturn5
R2
R1
FROM LIPS & POWER B/D
Placed on SMD-TOP
1600 mA
Placed on SMD-TOP
450 mA
400 mA + 600 mA
Close to IC
C
2009
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