LG 42LF20FR (CHASSIS:LP91A) Service Manual ▷ View online
+1.8V_DDR
DDR2_A[0-12]
DDR2_BA0
DDR2_BA1
DDR2_MCLK
DDR2_MCLKZ
DDR2_CKE
DDR2_ODT
DDR2_RASZ
DDR2_CASZ
DDR2_WEZ
DDR2_DQS0P
DDR2_DQS1P
DDR2_DQM0
DDR2_DQM1
DDR2_DQS0M
DDR2_DQS1M
+1.8V_DDR
+1.8V_DDR
DDR2_D[0-15]
1000pF
C905
V_REF
56
R900
56
R901
56
R902
56
R903
56
R904
56
R905
0.01uF
C904
0.01uF
50V
C900
0.01uF
C901
0.01uF
C902
0.01uF
C903
0.01uF
C906
0.01uF
C907
0.01uF
C908
0.01uF
C909
0.01uF
C910
0.01uF
C911
0.01uF
C912
0.01uF
C913
0.01uF
C914
0.01uF
C915
0.01uF
C916
0.01uF
C917
+1.8V_DDR
150
R906
READY
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.
V_REF
0.1uF
50V
C918
HYB18TC512160B2F-2.5
IC900
J2
VREF
J8
CK
H2
VSSQ2
B7
UDQS
N8
A4
P8
A8
L1
NC4
L2
BA0
R8
NC3
K7
RAS
F8
VSSQ3
F3
LDM
P3
A9
M3
A1
N3
A5
K8
CK
R3
NC5
L3
BA1
J7
VSSDL
L7
CAS
F2
VSSQ4
B3
UDM
M2
A10/AP
K2
CKE
R7
NC6
M7
A2
N7
A6
M8
A0
J1
VDDL
K3
WE
E8
LDQS
P7
A11
K9
ODT
A2
NC1
N2
A3
P2
A7
H8
VSSQ1
F7
LDQS
A8
UDQS
R2
A12
L8
CS
E2
NC2
E7
VSSQ5
D8
VSSQ6
D2
VSSQ7
A7
VSSQ8
B8
VSSQ9
B2
VSSQ10
P9
VSS1
N1
VSS2
J3
VSS3
E3
VSS4
A3
VSS5
G9
VDDQ1
G7
VDDQ2
G3
VDDQ3
G1
VDDQ4
E9
VDDQ5
C9
VDDQ6
C7
VDDQ7
C3
VDDQ8
C1
VDDQ9
A9
VDDQ10
R1
VDD1
M9
VDD2
J9
VDD3
E1
VDD4
A1
VDD5
B9
DQ15
B1
DQ14
D9
DQ13
D1
DQ12
D3
DQ11
D7
DQ10
C2
DQ9
C8
DQ8
F9
DQ7
F1
DQ6
H9
DQ5
H1
DQ4
H3
DQ3
H7
DQ2
G2
DQ1
G8
DQ0
10uF
10V
C919
1K
R907
1K
R908
DDR2_A[0]
DDR2_A[12]
DDR2_A[11]
DDR2_A[1]
DDR2_A[2]
DDR2_A[3]
DDR2_A[4]
DDR2_A[5]
DDR2_A[6]
DDR2_A[7]
DDR2_A[8]
DDR2_A[9]
DDR2_A[10]
DDR2_D[0-15]
DDR2_D[0]
DDR2_D[1]
DDR2_D[2]
DDR2_D[3]
DDR2_D[4]
DDR2_D[5]
DDR2_D[6]
DDR2_D[7]
DDR2_D[8]
DDR2_D[9]
DDR2_D[10]
DDR2_D[11]
DDR2_D[12]
DDR2_D[13]
DDR2_D[14]
DDR2_D[15]
DDR2
MSTAR
DDR2
8
9
2008/12/16
H6 LCD MERCURY
EAX56856904
DDR2 MEMORY
Close to DDR2 IC
Close to DDR2 IC
47uF
25
V
C1002
10K
R1003
NON 19_22"
0.01uF
C1007
DISP_EN/VAVS_ON
0.01uF
C1046
RL_ON
SAM2333
D1002
0.01uF
C1008
2SC3875S
Q1000
NON 19_22"
1
2
3
0.01uF
C1011
0.01uF
C1021
2SC3875S
Q1002
1
2
3
100
R1044-*1
PWM_DIM
10K
R1047
E-DIM
I-DIM
4.7K
R1054
NON SHARP 32&52",AUO
PANEL_STATUS
33K
R1065
NON 19_22"
1uF
25
V
C1056
33K
R1049
10K
R1048
RT1C3904-T112
Q1001
E
B
C
0.01uF
C1010
0.1uF
C1005
100uF1
6V
C1009
POWER_SW
10K
R1002
SI4925BDY
EBK32753101
Q1003
3
S2
2
G1
4
G2
1
S1
5
D2_1
6
D2_2
7
D1_1
8
D1_2
RT1C3904-T112
Q1004
E
B
C
10K
R1068
1.6K
R1069
22K
R1070
1uF
C1048
0.01uF
C1053
0
CMO 32,42,47,57
R1045
0 CMO 32,42,47
R1039
0
CMO 57"
R1040
0
NON CMO 32,42,47,57
R1043
0 CMO 57"
R1041
0
R1064
0 NON (CMO 32,42,47,57, SHARP 32")
R1023
0 SHARP 52",AUO
R1053
0
NON CMO 57"
R1001
0 CMO 32,42,47,57
R1014
0
R1042
1.2K
R1005
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.
P_12V_SMALL_15V
P_5V
P_5V
P_12V_SMALL_15V
+16V_NTP
+12V_AUDIO
+5VST_MST
P_12V_SMALL_15V
+5VST_MST
+3.3V_MST
+5V_USB
+5V_TUNER
+5V_+12V_LCD
+5V_MULTI
P_5V
+5V_MULTI
P_5V
P_12V_SMALL_15V
P_5V
+5VST_MST
+5V_MULTI
PANEL_ON
0.1uF
50V
C1001
10uF
16
V
C1052
10uF
16
V
C1019
10uF
16V
C1003
1/4W
0
5 %
R1074
19
_2
2"
SMAW200-11
P1002
19_22"
1
15V
2
15V
3
GND
4
GND
5
5V
6
5V
7
NC
8
NC
9
Inverter_ON
10
PWM_Dim
11
A.Dim
P_5V
P_24V_SMALL_15V
P_12V_SMALL_15V
P_24V_SMALL_15V
P_24V_SMALL_15V
OPC_OUT
0
READY
R1077
10K
19_22"
R1065-*1
MP2212DN
IC1006
3
IN
2
GND
4
BS
1
FB
5
VCC
6S
W
_1
7S
W
_2
8
EN/SYNC
+5V_MULTI
10
R1056
READY
0.1uF
50V
C1024
READY
10K
R1059
NON 19_22"
100uF
16V
C1026
5.6K
R1058
30K
R1057
S2A
50
V
19_22" D1001
10uF 25V
C1030
10uF 25V
C1031
10uF
16V
C1000
10uF
16V
C1020
+1.2V_VDDC_MST
0
R1073
0.1uF
C1054
+3.3V_MULTI_MST
100uF
16
V
C1028
+1.8V_DDR
+1.8V
+5V_MULTI
AP2121N-3.3TRE1
IC1007
1
GND
2
VOUT
3
VIN
0.1uF
16V
C1014
BD9130EFJ-E2
IC1001
3
ITH
2
VCC
4
GND
1
ADJ
5
PGND
6
SW
7
PVCC
8
EN
10K
R1006
1/10W
2K
1 %
R1009
1/10W
3.3K
1%
R1010
10uF
10V
C1016
10uF
6.3V
C1022
0.1uF
50V
C1015
0.1uF
50V
C1023
12K
R1008
560pF
50V
C1012
2200pF
50V
C1055
READY
3.3
R1078
READY
10uF
16V
C1004
10uF
16V
C1013
10K
R1079
AZ1085S-3.3TR/E1
IC1003
1
ADJ/GND
2
OUTPUT
3
INPUT
10uF
16V
C1017
10uF
16V
C1018
AP1117EG-13
IC1002
1
ADJ/GND
2
OUT
3
IN
1K
R1044
DC_DIM
1K
R1076
OPC_DISABLE
1K
R1075
OPC_ENABLE
0
R1013
2.2K
R1050
2.2K
R1051
2.2K
R1052
68uF
35V
C1006
0
R1012
NON 19_22"
3.6uH
L1009
CIC21J501NE
EAM58113401
L1000
CIC21J501NE
L1008
FW20020-24S
P1000
NON_19_22_26"
19
NC
14
12V
9
5.2V
4
GND
18
24V
13
12V
8
5.2V
3
GND
17
24V
12
GND
7
5.2V
2
Power ON
16
GND
11
GND
6
GND
1
NC
20
Inverter ON
15
GND
10
5.2V
5
GND
21
A.Dim
22
Error Out
23
NC
24
PWM Dim
120 5%
R1004
56 1%
R1007
10K
R1017
19_22"
2SC3875S
Q1005
19_22"
1
2
3
RL_ON
+5V_MULTI
10
R1015
19_22"
4.7K
R1016
19_22"
120-ohm
L1001
120-ohm
19/22"(HD)/22"(FHD)/32"(Sharp)
L1005
120-ohm
26/27/32(LPL)/37/42/47/52"
L1006
0LCML00003B
MLB-201209-0120P-N2
L1007
MLB-201209-0120P-N2
L1010
MLB-201209-0120P-N2
120-ohm
L1012
MLB-201209-0120P-N2
120-ohm
L1013
1uF
25
V
C1035
0.1uF
16V
C1025
0.47uF
25V
C1043
NON SHARP 52",AUO
2.2uF
16
V
C1045
DC_DIM
2.2uF
16
V
C1044
3K
R1046
FM20020-24
P1001
26"
19
NC
14
12V
9
5.2V
4
GND
18
24V
13
12V
8
5.2V
3
GND
17
24V
12
GND
7
5.2V
2
Power ON
16
GND
11
GND
6
GND
1
NC
20
Inverter ON
15
GND
10
5.2V
5
GND
21
A.Dim
22
Error Out
23
NC
24
PWM Dim
25
.
2.2uH
L1002
10K
R1020
2K
R1018
NON 19_22"
1K
OPC_DISABLE
R1021
1K
OPC_ENABLE
R1022
68uF 35V
C1027
READY
10
R1024
0.1uF
50V
C1029
+5V_MULTI
0
R1011
560pF
50V
C1032
2.2K
R1000
NON 19_22"
1uF
25
V
READY
C1034
1uF
25
V
READY
C1036
1uF
25
V
READY
C1037
1uF
25
V
READY
C1038
0.1uF 50V
C1033
9 9
POWER
MSTAR
2008/12/16
LED Block
**5V_MULTI->3.3V->1.2V
**Switch 12V:P12V
**Switch 5V:5V_MULTI -> 1.8V
H6 LCD MERCURY
EAX56856904
*SHARP32":DC DIMMING
**DC-DC CONVERTER
12V->5V_TUNER/USB
OUT:5V
*ST 5V->3.3V
**OPC_ENABLE : USE LGD Module
MAX 300mA
MAX 3A
OUT:1.27V
NTP,AUDIO DSP
DDR2, Vref
V0 = 0.8*(1+(R2/R1))
MAX 2A
MAX 3A
R1
R2
MAX 1A
OUT:3.3V
R1
R2
V0 = 0.8*(1+(R1/R2))
V0 = 1.25*(1+(R2/R1))
R1
R2
OUT:1.85V
Small(19_22")
Close to Q1003