LG 37LH35FR (CHASSIS:LP91A) Service Manual ▷ View online
- 16 -
No Sound
Check The Input Sourse.
Check The Input/Output
Of IC600.
Re-soldering or
Change the defect part.
Fail
Pass
Pass
Check The Speaker.
Change Speaker.
Fail
Check The Speaker Wire.
Pass
Change The Source Input.
Fail
No Raster On AV (Video, S-Video)Signal
No Signal On TV(RF) Signal
Check Input source
Cable And Jack
Pass
Check Input source
Cable And Jack
Pass
Check The Input/Output
Of JK101, JK201
Pass
Re-soldering or
Change the defect part
Pass
Fail
Pass
Repeat [A], & [B] Process
Check the Input/Output
Of IC800
Fail
Re-soldering or
Change the defect part
Pass
Check The Input/Output
Of TU500
Pass
Re-soldering or
Change the defect part
Pass
Fail
Check the Input/Output
Of IC800
Fail
Re-soldering or
Change the defect part
Repeat [A], & [B] Process
- 17 -
BLOCK DIAGRAM
RG
B
_
P
C
PC
_
A
u
d
io
TV
(R
F
)
CO
M
P
1
HD
M
I1
HD
M
I2
RS
2
3
2
TX
232
C
D
riv
e
r
S
T
3232
C
T
x
/
R
x
:
15V
p
p
P
C
_
R
/G
/B
/
H
S
/
V
S
PC
_
A
u
d
io
_
L
/
R
:
70
0m
V
rms
MNT
_
O
U
T
:
1V
p
p
SI
D
E
_
V
:
1V
p
p
SI
D
E
_
L
/
S
ID
E
_
R
:
500mV
rms
D
D
R
2(
51
2M
B)
L
_
S
PK_
O
U
T
R
_
SP
K_
O
U
T
E
EPR
O
M
24C
0
2
Co
m
p
1
_
L
/
R
:
500mV
rms
TU
N
E
R
AV
1
_
V
IN
:
1V
p
p
A
V
11_
L
IN
/
R
IN
:
50
0m
V
rms
PW
M
N
T
P
3
100L
MNT
_
O
U
T
MNT
_
LO
U
T
/
R
O
U
T
:
5
00m
V
rm
s
AV
2
(S
id
e
A
V
)
MAI
N
S
C
AL
E
R
T
X
D
/
R
X
D
:
5V
Di
g
it
a
l
CO
M
P
1
_
Y
/
P
b
/
P
r
:
1/
0.
7
V
p
p
CO
M
P
2
_
Y
/
P
b
/
P
r
: 1
/
0.
7
V
p
p
IR
H
D
MI
_
D
AT
A_
1
H
D
MI
_
D
AT
A_
2
H
D
M
I1
_
SC
L
/
SD
A
O
U
T_
E
_
TX
_
C
L
K
O
U
T_
E
_
TX
_
E
O
U
T_
E
_
TX
_
D
O
U
T_
E
_
TX
_
C
O
U
T_
E
_
TX
_
B
O
U
T_
E
_
TX
_
A
TU
_
M
A
IN
S I
F
CO
M
P
1
_
Y
/
P
b
/
P
r
1
/
0.
7V
p
p
AV
1
_
V
IN
P
C
_A
u
d
io
_L
/
R
CO
M
P
1
_
L
IN
/
R
IN
L_
C
H
R_C
H
LV
DS
co
nnec
tor
TU
_
M
A
IN
SU
B
_
SC
L
SD
A
E
EPR
O
M
24C
0
2
E
EPR
O
M
24C
0
2
SI
F
AV
1
_
LI
N/
R
IN
MNT
_
L/
R
O
U
T
AV
1
MN
T
_
O
U
T
Co
m
p
2
_
L
/
R
:
500mV
rms
CO
M
P
2
_
Y
/
P
b
/
:
1/
0
.7
V
p
p
CO
M
P
2
_
L
IN
/
R
IN
CO
M
P
2
O
U
T_
O
_
TX
_
C
L
K
O
U
T_
O
_
TX
_
E
O
U
T_
O
_
TX
_
D
O
U
T_
O
_
TX
_
C
O
U
T_
O
_
TX
_
B
O
U
T_
O
_
TX
_
A
P
C
_
R
/G
/B
/
H
S
/
V
S
H
D
M
2
_
S
CL
/
S
DA
P
C
_
S
CL
/
S
DA
MNT
_
V
O
U
T
AV
2
_
V
IN
AV
2
_
LI
N/
R
IN
II
S
_
O
U
T
US
B
US
B
_
D
N
/
P
N
AU
D
IO
AMP
H
D
M
I3
_
SC
L
/
SD
A
E
EPR
O
M
24C
0
2
H
D
MI
_
D
AT
A_
3
TM
D
S
TM
D
S
TM
D
S
HD
M
I3
US
B
Fo
r D
/
L
E
E
PR
O
M
(2
5
6
K)
S
e
ri
al
F
las
h
(8
M
B
y
te
)
RG
B
_
P
C
PC
_
A
u
d
io
TV
(R
F
)
CO
M
P
1
HD
M
I1
HD
M
I2
RS
2
3
2
TX
232
C
D
riv
e
r
S
T
3232
C
±
P
C
_
R
/G
/B
/
H
S
/
V
S
PC
_
A
u
d
io
_
L
/
R
:
70
0m
V
rms
MNT
_
O
U
T
:
1V
p
p
SI
D
E
_
V
:
1V
p
p
SI
D
E
_
L
/
S
ID
E
_
R
:
500mV
rms
D
D
R
2(
51
2M
B)
E
EPR
O
M
24C
0
2
Co
m
p
1
_
L
/
R
:
500mV
rms
TU
N
E
R
AV
1
_
V
IN
:
1V
p
p
A
V
11_
L
IN
/
R
IN
:
50
0m
V
rms
PW
M
N
T
P
3
100L
MNT
_
O
U
T
MNT
_
LO
U
T
/
R
O
U
T
:
5
00m
V
rm
s
AV
2
(S
id
e
A
V
)
MAI
N
S
C
AL
E
R
T
X
D
/
R
X
D
:
5V
Di
g
it
a
l
CO
M
P
1
_
Y
/
P
b
/
P
r
:
1/
0.
7
V
p
p
CO
M
P
2
_
Y
/
P
b
/
P
r
: 1
/
0.
7
V
p
p
H
D
MI
_
D
AT
A_
1
H
D
MI
_
D
AT
A_
2
_
O
U
T_
E
_
TX
_
C
L
K
±
O
U
T_
E
_
TX
_
±
O
U
T_
E
_
TX
_
±
O
U
T_
E
_
TX
_
C
±
O
U
T_
E
_
TX
_
B
±
O
U
T_
E
_
TX
_
A
±
TU
_
M
A
IN
S I
F
CO
M
P
1
_
Y
/
P
b
/
P
:
1
/
0.
7V
p
p
AV
1
_
V
IN
P
C
_A
u
d
io
_L
/
R
CO
M
P
1
_
L
IN
/
R
IN
L_
C
H
R_C
H
LV
DS
co
nnec
tor
TU
_
M
A
IN
/
E
EPR
O
M
24C
0
2
E
EPR
O
M
24C
0
2
SI
F
AV
1
_
LI
N/
R
IN
MNT
_
L/
R
O
U
T
AV
1
MN
T
_
O
U
T
Co
m
p
2
_
L
/
R
:
500mV
rms
CO
M
P
2
_
Y
/
P
b
/P
r
1/
0
.7
V
p
p
CO
M
P
2
_
L
IN
/
R
IN
CO
M
P
2
O
U
T_
O
_
TX
_
C
±
O
U
T_
O
_
TX
_
E
±
O
U
T_
O
_
TX
_
D
±
O
U
T_
O
_
TX
_
C
±
O
U
T_
O
_
TX
_
B
±
O
U
T_
O
_
TX
_
A
±
P
C
_
R
/G
/B
/
H
S
/
V
S
P
C
_
S
CL
/
S
DA
P
C
_
S
CL
/
S
DA
MNT
_
V
O
U
T
AV
2
_
V
IN
AV
2
_
LI
N/
R
IN
II
S
_
O
U
T
US
B
US
B
_
D
N
/
P
N
AU
D
IO
AMP
H
D
M
I3
_
SC
L
/
SD
A
H
D
M
I3
_
SC
L
/
SD
A
E
EPR
O
M
24C
0
2
H
D
MI
_
D
AT
A_
3
TM
D
S
TM
D
S
TM
D
S
HD
M
I3
US
B
Fo
r D
/
L
E
E
PR
O
M
(2
5
6
K)
S
e
ri
al
F
las
h
(8
M
B
y
te
)
- 18 -
300
200
810
510
120
500
310
320
900
550
530
540
803
800
802
521
400
801
550
804
200T
LV
1
A2
A10
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
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.
CVBS_LIN
MUTE_LINE
AUDIO_R
SD05
ZD100
100uF
16
16
V
C
102
SD05
ZD103
SD05
ZD105
MNT_ROUT
CVBS_VIN
SPK_R+_HOTEL
RT1C3904-T112
Q100
E
B
C
SPK_R-_HOTEL
CVBS_RIN
SD05
ZD104
10uF
16V
C101
MUTE_LINE
SD05
ZD101
SD05
ZD102
MNT_LOUT
RT1C3904-T112
Q101
E
B
C
MNT_VOUT
10uF
16V
C100
30V NON_HOTEL_OPT
D102
30V NON_HOTEL_OPT
D103
30V
D101
30V
ADUC30S03010L_AMODIODE
D100
30V
D104
30V
D105
COMP2_Y
COMP2_PB
COMP2_PR
COMP2_L
COMP2_R
S_VIDEO_DET
SIDE_Y
SIDE_C
+3.3V_MULTI_MST
OPT
READY
C104
30V
D106
30V
D107
SD05
ZD106
SD05
ZD107
PSJ014-01
JK101
S-VIDEO
GND
6
1
C-LUG1
2
C-LUG2
3
0-SPRING
4
C-LUG3
5
C-LUG4
SHIELD
7
75
R102
0
HOTEL_OPT
R103
0
HOTEL_OPT
R105
0
NON_HOTEL_OPT
R106
0
HOTEL_OPT
R101
75
R109
75
R108
75
R107
220K
R104
12K
R118
12K
R117
12K
R119
12K
R120
10K
R113
10K
R115
10K
R116
220K
R100
220K
R111
220K
R112
75
R110
75
R122
S-VIDEO
75
R121
S-VIDEO
10K
R123
100pF READY
C103
10K
R114
PPJ226-01
JK100
9A
[GN]1P_CAN
4A
[GN]O-SPRING_A
3A
[GN]CONTACT_A
9B
[BL]1P_CAN
8B
[BL]C-LUG_A
9C
[RD]1P_CAN_1
8C
[RD]C-LUG_A
9D
[WH]1P_CAN
8D
[WH]C-LUG_A_1
9E
[RD]1P_CAN_2
4E
[RD]O-SPRING_A_1
3E
[RD]CONTACT_A_1
9F
[YL]2P_CAN
4F
[YL]O-SPRING_A
3F
[YL]CONTACT_A
9G
[WH]2P_CAN
8G
[WH]C-LUG_A_2
9H
[RD]2P_CAN
4H
[RD]O-SPRING_A_2
3H
[RD]CONTACT_A_2
5J
[YL]O-SPRING_B
6J
[YL]CONTACT_B
7K
[WH]C-LUG_B
5L
[RD]O-SPRING_B
6L
[RD]CONTACT_B
1 9
2008/12/16
INPUT1
MSTAR N-EU
EAX56856904
H6 LCD MERCURY
POP NOISE
MNT_OUT
COMPONENT1
POP NOISE
AV1
COMPONENT1, AV1, MNT_OUT[JACK PACK TYPE D] : JK100
S-VIDEO(China Model)
INPUT1 : COMPONENT1, S-VIDEO
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