Read LG 47LH55 (CHASSIS:LA92B) Service Manual online
12V_TCON
+5V
SI4925BDY
Q706
3
S2
2
G1
4
G2
1
S1
5
D2_1
6
D2_2
7
D1_1
8
D1_2
+12V
PANEL_CTL
001:AR32
+5V_ST
+5V_ST
10K
R728
OPT
10K
R726
POWER_ON/OFF
001:AR31;010:AG9
+5V_GENERAL
22K
R732
22K
R735
10K
R727
2SC3052
Q703
E
B
C
2SC3052
Q705
E
B
C
2SC3052
Q704
E
B
C
560
R730
10K
R729
10uF
C742
OPT
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.
GND
GND
GND
10uF
10V
C757
120K
R725
R725
OPT
BLM18PG121SN1D
L714
+3.3V_MEMC
GND
+3.3V
0.1uF
C746
0.1uF
16V
C753
0.1uF
16V
C760
0.1uF
C749
0.1uF
16V
C758
10uF
C756
22uF 16V
C752
22uF 16V
C750
3225
22uF
16V
C773
+5V_EXT
+12V
0.1uF
16V
C774
+5V
BLM18PG121SN1D
L727
OPT
0.1uF
16V
C780
+3.3V_FE
POWER_EN
001:AR30;007:B6;007:T18;007:T3;007:AG9;007:AO16
100
R754
OPT
POWER_EN
001:AR30;007:B6;007:T3;007:AG9;007:AM26;007:AO16
100
OPT
R756
CB3216PA501E
L716
CB3216PA501E
L722
10K
R718
+3.3V_ST
0.1uF
16V
C747
4.7uF
6.3V
OPT
C761
4.7uF
6.3V
OPT
C762
15pF
50V
C711
PWM_DIM
001:AF12
4.7K
R707
ERROR_OUT
001:AB20
4.7K
R704
0.1uF
16V
OPT
C709
BG2012B080TF
L705
POWER_ON/OFF
001:AR32
+5V_ST
0
R709
OPT
120K
OPT
R701
BG2012B080TF
L700
47uF
25V
C722
1uF
25V OPT
C725
0.1uF
50V
C719
2SC3052
Q702
E
B
C
100
R714
22uF
16V
OPT
C731
0.1uF
50V
C728
0.1uF
16V
OPT
C707
1uF
25V
C706
1uF
35V
C723
A_DIM 001:AF12
6.8K
OPT
R715
+24V
0.1uF
50V
OPT
C720
10K
R719
+5V_GENERAL
CB4532UK121E
L704
CB4532UK121E
L706
22uF
16V
OPT
C730
220uF
16V
C726
+12V
MLB-201209-0120P-N2
L707
0
R761
OPC_EN
OPC_OUT1
001:AF12
0.1uF
C793
22uF
16V
C791
1/10W
10
1%
R724
1/10W
10K
R738
+5V_GENERAL
NR8040T3R6N
3.6uH
L726
1/10W
22K
1%
R723
1/8W
75K
1%
R722
1uF
16V
C788
22uF
16V
C792
22uF
C787
OPT
0.1uF
16V
OPT
C790
+3.3V
+1.26V_VDDC
22uF
C786
1/10W
10K
OPT
R731
10nF
50V
C789
CB3216PA501E
L711
+3.3V_ST
0.1uF
16V
C717
0.1uF
16V
C710
+3.3V_ST
+3.3V_AVDD_MPLL
+5V_ST
0.1uF
16V
C705
10uF
10V
C704
BLM18PG121SN1D
L703
10uF
6.3V
C708
+1.26V_MEMC
+1.8V_MEMC
1K
R744
1uF
16V
C770
+5V_GENERAL
100
OPT
R716
OPC_OUT2
001:AF12
0.1uF
50V
C735
OPT
0
Except_OPC
R760
10nF
50V
R781
22uF
16V
C777
0
R764
1/8W
300K
1%
R767
22uF
C764
OPT
+1.8V_MEMC
22uF
C763
+5V_EXT
1/10W
10
1%
R768
NR8040T3R6N
3.6uH
L712
22uF
16V
C776
1/8W
390K
1%
R766
1uF
16V
C767
1/10W
10K
R763
POWER_EN
100
OPT
R765
1/10W
33K
1%
R752
1/10W
30K
1%
R750
1/10W
27K
1%
R751
CB3216PA501E
L715
CB3216PA501E
L708
CB3216PA501E
L709
47
R742
MP2212DN
IC707
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
47
R759
MP2212DN
IC705
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
2SC3052
OPT
Q707
E
B
C
+5V_ST
10K
OPT
R747
0
R743
10uF
6.3V
C771
10uF
6.3V
C759
0.01uF
25V
C779
10uF
6.3V
C778
10uF
6.3V
C754
OPT
C766
BLM18PG121SN1D
L719
CB3216PA501E
L724
47K
R739
47K
R740
10K
OPT
R721
10K
R720
+3.3V_ST
0
R713
10K
OPT R753
2SC3875S(ALY)
OPT
Q708
E
B
C
INV_CTL
001:AR31
BLM18PG121SN1D
L717
0
R771
0
OPT
R773
RL_ON
001:AR32
10K
R733
OPT
22uF
16V
C732
22uF
C733
OPT
1N4148W_DIODES
100V
D700
OPT
1/10W
56K
1%
R770
1/10W
18K
1%
R769
NR8040T3R6N
3.6uH
L710
BLM18PG121SN1D
L720
GND
47
R737
10nF
50V
C741
MP2212DN
IC704
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
1/10W
10
1%
R734
10uF
6.3V
C751
GND
MP2212DN
IC706
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
1/10W
10K
R748
OPT
68K
R746
NR8040T3R6N
3.6uH
L718
1N4148W_DIODES
100V
D701
OPT
1/8W
13K
1%
R762
10nF
50V
C718
1uF
10V
C734
47
R749
22uF
16V
C765
22uF
16V
C768
OPT
1N4148W_DIODES
100V
OPT
D702
22uF
16V
C714
+3.3V
+1.8V_DDR
BLM18PG121SN1D
L702
9.1K
1%
R712
SC4215ISTRT
IC701
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
12K
1%
R711
0.1uF
16V
C713
10uF
10V
C712
0.1uF
16V
C715
1uF
10V
C737
POWER_ON_DELAY
0
OPT
R772
22uF
25V
C748
1N4148W_DIODES
100V
D703
OPT
POWER_EN
1uF
25V
C755
68uF
C721
35V
68uF
C727
35V
4.7uF
25V
C740
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_GENERAL
CB3216PA501E
L725
1/8W
24K
1
%
R736
APE8953MP
IC708
3
VOUT_1
2
FB
4
VOUT_2
1
GND
5
VIN
6
VCNTL
7
POK
8
EN
AP1117E33G-13
IC702
2
OUT
3
IN
1
ADJ/GND
3.3K
R717
POWER_ON_DELAY
0
R758
0
R757
10K
R705
OPT
33K
OPT
R708
BLM15BD121SN1
L701
+3.3V_ST
RT1P141C-T112
Q701
1
2
3
2SC3052
Q700
OPT
E
B
C
10K
R702
OPT
0
R703
3.3K
R710
560pF
50V
C781
560pF
50V
R782
560pF
50V
C724
560pF
C772
1/10W
10K
R755
1/10W
2K
5%
R1508
100K
5%
R774
GND
1uF
10V
C782
L728
82K
R741
0.47uF
16V
OPT
C716
1/10W
10
1%
R745
+3.3V_ST
+5V_ST
0
R775
OPT
0
R776
+5V_GENERAL
20K
R706
+5V_+12V
ROM LIPS & POWER B/D
C1130
INV ON
Err OUT
24V
A.DIM
465 mA @85% efficiency
Placed on SMD-TOP
C OUT
MAX 3A
1600 mA
R1
4.9A 0.0150OHM 34MHZ
3A, DCR=0.025 ohm
Placed on SMD-TOP
Close to IC
$0.07
Close to IC
Vout=0.8*(1+R1/R2)
R2
C IN
450 mA
Placed on SMD-TOP
R2
R1/R2 = 12K/20K => Vout=1.28
+1.26 Core for URSA
Placed on SMD-TOP
Vout=0.8*(1+R1/R2)
Replaced Part
1.5mA
R1
C OUT
C IN
Close to IC
R1
$0.07
+1.8V_MEMC for URSA DDR
415 mA @85% efficiency
Vout=0.8*(1+R1/R2)
Replaced Part
$0.24
Placed on SMD-TOP
Close to IC
R2
400 mA + 600 mA
Placed on SMD-TOP
4.9A 0.0150OHM 34MHZ
About 1.84V
R1
R2
Placed on SMD-TOP
Close to IC
Vout=0.8*(1+R1/R2)
Placed on SMD-TOP
Close to IC
R2
Placed on SMD-TOP
PI Result
Close to IC
Close to IC
R1
+5V_EXT
+3.3V
+1.8V for Saturn5 DDR
R1/R2 : 27K / 20K => Vout=1.88
R1/R2 : 12K / 9.1K => Vout=1.85
R1/R2 : 15K / 12K => Vout=1.80
+1.26 Core for Saturn5
Stand-by +3.3V
C
2009
POWER
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