DOWNLOAD LG 37LH50YD (CHASSIS:LB91B) Service Manual ↓ Size: 4.92 MB | Pages: 66 in PDF or view online for FREE

Model
37LH50YD (CHASSIS:LB91B)
Pages
66
Size
4.92 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37lh50yd-chassis-lb91b.pdf
Date
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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.
11_TUNER
C1168
0.1uF
16V
FE_SIF
002:T17
TUNER_SIF_IF_N
011:A22
+1.8V_TU_CE
R1154
33
C1115
0.1uF
+3.3V_TUNER
C1167
0.1uF
16V
IF_AGC
C1138
0.1uF
16V
/DEMOD_RESET
R1147
4.7K
R
1
1
2
2
0
+1.8V_TU_XE
FE_TS_SERIAL
001:AJ17
R1152
10K
OPT
C1145
18pF
50V
R1179
1K
R1175
1K
R1117
680
C1179
0.1uF
16V
C1172
0.1uF
16V
C1163
0.1uF
16V
C1106
56pF
C1169
0.1uF
16V
C1174
0.1uF
16V
+1.8V_TUNER
JK1102
PAL-STRAIGHT
OPT
1
2
C1104
0.1uF
FE_TS_DATA_CLK
C1124
0.1uF
16V
+3.3V_TU_XE
L1109
CM2012F2R2KT
R1150
10K
FE_TS_SYN
001:AJ18
C1122
0.1uF
16V
C1112
0.1uF
C1173
0.1uF
16V
C1141
0.1uF
16V
+3.3V_TU_CE
C1131
0.1uF
16V
+3.3V_TUNER
C1129
0.1uF
16V
C
1
1
6
2
2
2
p
F
OPT
R
1
1
0
8
3
9
0
IF_AGC
+1.8V_TU_CE
+5V_TUNER_IF
DTV_IF_P
TUNER_CVBS_IF_P
C1164
10uF
6.3V
+5V_TUNER_IF
+1.8V_TU_CE
+1.8V_TU_CE
C1159
0.1uF
16V
L1115
C1177
0.1uF
16V
C1165
10uF
6.3V
C1137
0.1uF
C1127
0.1uF
16V
DTV_IF_N
C1126
0.1uF
16V
C1156
22pF
50V
+3.3V_TU_CE
C1119
0.1uF
16V
LD100
SAM2333
OPT
A
2
[
G
N
]
C
A
1
[
R
D
]
C1117
0.1uF
+3.3V_TU_CE
DTV_IF_P
C1170
0.1uF
16V
R1148
0
1/16W
5%
L1113
R1155
100K
OPT
R1101 680
+3.3V_TU_CE
R1149
0
C1171
0.1uF
16V
+3.3V_TU_CE
+3.3V_TU_CE
FE_VMAIN
002:D24
+3.3V_TU_XE
DTV_IF_N
011:AG17
C1128
0.1uF
16V
C1135
0.1uF
16V
C1103
0.1uF
R1173
1K
C1134
0.1uF
16V
TUNER_SIF_IF_N
R1130
0
C1176
0.1uF
16V
+1.8V_TU_XE
R1171
10K
R1109
390
C1116
0.1uF
C1120
1000pF
50V
C1130
0.1uF
16V
R1142
0
L1116
+1.8V_TUNER
R1169
33
+1.8V_TU_XE
+1.8V_TU_CE
R1128
0
R1141
0
FE_TUNER_SDA
C1146
18pF
50V
C
1
1
6
1
2
2
p
F
OPT
C1139
270pF
OPT
FE_TUNER_SCL
C1158
22pF
50V
C1160
0.1uF
16V
R1118
4.99K
1%
R1170
10K
C1166
0.1uF
16V
+3.3V_TU_XE
L1114
C1157 0.1uF
16V
R
1
1
2
1
3
9
0
R1127
390
R1168
33
+1.8V_TU_XE
C1121
0.1uF
16V
C1113
0.1uF
C1114
1000pF
TUNER_CVBS_IF_P
R1167
33
+1.8V_TU_XE
C1132
0.1uF
16V
C1152
0.1uF
16V
C1151
0.1uF
16V
+1.8V_TUNER
C1148
0.1uF
16V
+3.3V_TUNER
C1153
0.1uF
16V
IC1105
AZ1117H-1.8TRE1(EH13A)
2
OUTPUT
3
INPUT
1
ADJ/GND
IC1103
AZ1117H-3.3
2
OUTPUT
3
INPUT
1
ADJ/GND
C1155
22uF
16V
GND
C1147
0.1uF
16V
C1154
22uF
16V
L1112
BLM18AG121SN1D
C1150
22uF
16V
L1111
BLM18AG121SN1D
+5V_TUNER
C1149
0.1uF
16V
IC1102
XC5000
1
VDDA_1
2
IN1
3
GND_1
4
IN2
5
GND_2
6
EXTCHOKE
7
GND_3
8
VDDA_2
9
VDDA_3
10
VDDC_1
11
GND_4
12
VDDC_2
13
VDDC_3
14
VDDA_4
15
VAGC
16
VIF
17
VDDA_5
18
SIF
19
GND_5
20
VDDC_4
21
VDDA_6
22
GND_6
23
VDDD_1
24
TESTMODE
25
DDI1
26
VDDC_5
27
DDI2
28
ADDRSEL
29
X2
30
GND_7
31
X1
32
EXTREF
33
VDDD_2
34
SCL
35
SDA
36
GND_8
37
RESET
38
VI2C
39
VDDC_6
40
VREF_N
41
VREF_P
42
VDDC_7
43
VDDC_8
44
REXT
45
VDDA_7
46
GND_9
47
VDDC_9
48
VDDA_8
C1123
0.1uF
16V
C1133
0.1uF
16V
C1136
0.1uF
16V
R
1
1
5
9
0
+5V_TUNER_IF
R1144
100
R1143
100
R1112
0
FE_TS_VAL
001:AJ18
/FE_RESET
R1180
33
C1125
0.1uF
16V
C1101
10pF
50V
C1118
10pF
50V
IC1104
CE6355
1
VSS_1
2
VDD_1
3
VSS_2
4
CLK1
5
DATA1
6
IRQ
7
CVDD_1
8
VSS_3
9
RESET
10
SLEEP
11
STATUS
12
SADD4
13
VDD_2
14
VSS_4
15
SADD3
16
SADD2
17
SADD1
18
SADD0
19
CVDD_2
20
VSS_5
21
PLLVDD
22
PLLGND
23
XTI
24
XTO
25
VSS_6
26
PLLTEST
27
OSCMODE
28
AVDD
29
AGND_1
30
VIN
31
VIN
32
AGND_2
33
VDD_3
34
RFLEV
35
CLK2/GPP0
36
DATA2/GPP1
37
CVDD_3
38
VSS_7
39
CVDD_4
40
VSS_8
41
AGC2/GPP2
42
AGC1
43
GPP3
44
SMTEST
45
VDD_4
46
VSS_9
47
MOSTRT
48
MOVAL
49
MDO0
50
MDO1
51
MDO2
52
MDO3
53
MDO4
54
VDD_5
55
VSS_10
56
MDO5
57
MDO6
58
MDO7
59
CVDD_5
60
VSS_11
61
MOCLK
62
BKERR
63
MICLK
64
CVDD_6
X1101
31.875MHz
OSC-CRYSTAL
D1101
Q1101
ISA1530AC1
E
B
C
Q1102
ISA1530AC1
E
B
C
Q1103
ISA1530AC1
E
B
C
Q1104
ISA1530AC1
E
B
C
JK1101
KCN-ET-0-0094
1
2
L1103
2%
270nH
C1108
39pF
L1105
6.8nH
2%
L1106
390nH
2%
L1108
820nH 2%
L1101 2.7uH
L1107 2.7uH
X1102
20.48MHz
L1102
OPT
1uH
+5V_TUNER_IF
+5V_TUNER
+3.3V_TUNER
+5V_TUNER_IF
+5V_TUNER_IF
R1102
0
OPT
R1103
0
C1107
120pF
C1142
15pF
C1143
15pF
X1103
31.875MHz
OSC-CERAMIC
4
GND_2
1
X-TAL_1
2
GND_1
3
X-TAL_2
TUNER
EAX60148002-0(LH50)
11    11
   2009.01.19
$2.25
$1.2
$0.051
$0.051
$0.085
$0.085
$0.088
Contents of LCD TV Standard Repair Process
No.
Error symptom (High category)
Error symptom (Mid category)
Page
Remarks
1
A. Video error
No video/Normal audio 
2 
No video/No audio
3
Video error, video lag/stop
4
Color error
5
Vertical/Horizontal bar, residual image, 
light spot, external device color error
6
B. Power error
No power
7
Off when on, off while viewing, power auto 
on/off
8
C. Audio error
No audio/Normal video  
9
Wrecked audio/discontinuation/noise
10
D. Function error
No response in remote controller, key error, 
recording error, memory error
11
External device recognition error 
12
E. Noise
Circuit noise, mechanical noise
13
F. Exterior error
Exterior defect
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Normal 
audio
Y
N
Move to No 
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power 
Board
12v,5v  etc.
Normal 
voltage
Y
N
Replace Main Board
Replace T-con 
Board or module
OR
Repair Power 
Board or parts
Check Power Board 20V or 24v output
Normal
voltage
Y
Replace Inverter 
or module
N
Repair Power 
Board or parts
End
Always check & record S/W Version and White 
Balance value before replacing the Main Board
Replace Main Board 
Re-enter White Balance value
※Precaution
Established
date 
Electronics 6-3
Standard Repair Process
Revised date 
2008. 3 .26
1/13
LCD  TV
Error
symptom
A. Video error
No video/ Normal audio 
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
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