LG 32LF15R (CHASSIS:LP81A) Service Manual ▷ View online
- 17 -
Set on speaker
in menu.
in menu.
Download the
EDID data.
EDID data.
Check the signal after
IC600 refer to circuit
diagram.
IC600 refer to circuit
diagram.
No
No
No
Check the Tuner In/Out.
No
No
Check the Speaker
cable.
cable.
No
Replace IC600.
No
Replace IC801.
No
Yes
Yes
All input(mode)
is no sound.
Only HDMI is
no sound.
Is the speaker
cable normal?
cable normal?
Is the speaker
on it menu?
Yes
Only AV/COM2/PC
input is no sound.
Is the output of
IC600 normal?
IC600 normal?
Yes
Yes
Only RF is no sound.
Yes
Is IC801 operated
normality?
Yes
Replace IC601.
Replace Main B/D.
No
Is IC601 operated
normality?
Yes
6. No Sound
(1) Symptom
1) LED is green
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check process
- 18 -
RF
(T
U
500)
RG
B
(S
V
C
O
n
ly
)
(J
K
104)
T
M
DS
/
DDC/
H
P
D_
S
IN
K
HDM
I_
S
E
L
/
HD
M
I_
II
C
LG
E
6
8
9
1
D
D
(I
C
801)
LG
E
6
8
9
1
D
D
(I
C
801)
HDM
I
(D
T
V
O
n
ly
)
(J
K
3
0
1
)
TM
D
S
Mu
x
T
M
DS
/
DDC/
H
P
D_
S
/
W
AV
I
N
(J
K
200)
MNT
_
O
U
T
(J
K
2
0
0
)
LC
D
(L
V
D
S
)
(P
403)
LC
D
(L
V
D
S
)
(P
403)
TX
C
O
[
0
:4
]
/
TX
C
E
[
0
:4
]
/
TX
C
L
K
O
/
TX
C
L
K
E
N
T
P
3000
Dig
it
a
l A
M
P
(I
C
6
0
0
)
N
T
P
3000
Dig
it
a
l A
M
P
(I
C
6
0
0
)
C
O
M
P
IN
(J
K
101)
IIC
_
D
S
U
B
CV
B
S
_
V
IN
COMP
Y
/P
b
/
P
r
T
V
_M
A
IN
/
M
A
IN
_S
IF
SI
F
AM_
AU
D
IO
COMP
_
L
R
MN
T
_
LR
_
O
UT
SP
K
2
C
H
/S
P
K
_
H
O
T
E
L
SW
IT
C
H
DU
A
L
F
E
T
SW
IT
C
H
DU
A
L
F
E
T
L
V
D
S
_
P
W
R
_
12V
/
R
L
_
O
N
+
12V
24
C
64
EE
P
R
O
M
DDC
HD
M
I_
5
V
_
D
E
T
(HP
D
)/
HP
D
_
M
S
T
CV
B
S
_
L
/
R
IN
MNT
_
V
O
UT(
A
MP
:
GA
IN
X 4
)
/M
U
T
E
_
L
IN
E
AM
P
G
A
IN
X
4
(I
C
601)
24C
64
EEP
R
O
M
DDC
IIC_
S
Y
S
SE
C
A
M
_
L
DDR
(I
C
9
0
0
)
DDR
(I
C
9
0
0
)
M
A
D
R
[
0:
11]
M
D
A
T
A
[
0:
15]
S
W
_
R
ES
ET
/
I
IC
_
P
A
R
T
I2
S
M
U
T
E
_M
A
IN
/
A
C
_D
E
T
AM
P
_
MU
T
E
_
H
O
T
E
L
PS
U
(P
1
1
0
0
)
PS
U
(P
1
1
0
0
)
R
L
_
O
N
/
SEL
E
C
T
/
DIM
M
IN
G/
S
Y
N
C
MNT
_
5
V
/
A
C
_
D
E
T
/S
C
_
R
S
T
M
X
25L
1
605
S
F
-R
O
M
(16M
)
(I
C
8
0
3
)
M
X
25L
1
605
S
F
-R
O
M
(16M
)
(I
C
8
0
3
)
SP
I_
C
Z
/
C
L
K
SP
I_
D
AU
D
IO
_
R
(I
C
300)
(I
C
302)
(I
C
802)
BLOCK DIAGRAM
- 19 -
300
200
510
500
120
122
400
800
801
802
804
803
530
540
52
1
821
830
805
550
910
900
200T
200N
A10
A9
A2
LV
1
401
904
902
901
905
903
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.
0.1uF
C1135
22uH
L1101
AZ1117H-ADJTRE1(EH11A)
IC1104
2
OUTPUT
3
INPUT
1
ADJ/GND
2.7K
R1126
READY
PANEL_STATUS
AZ1117H-ADJTRE1(EH11A)
IC1101
2
OUTPUT
3
INPUT
1
ADJ/GND
DCDC_7.22V_PIP
22K
R1130
P_12V
402
1%
R1144
7.5K
R1120
1.2K
R1190
READY
+1.2V_VDDC_MST
0.1uF
C1102
MP2355DN-LF-Z
IC1102
3
VIN
2
BST
4
LX
1
SS
5
GND
6
FB
7
COMP
8
RUN
+5V_MULTI
110
1%
R1123
0.1uF
C1101
10K
R1189
READY
P_5V
47uF
25
V
C1137
0.1uF
C1140
P_16V
10K
R1135
P_5V
AC_RST
0
R1125
P_5V
10uF 16V
C1107
0.01uF
C1103
RL_ON
10K
R1133
10K
R1134
2.2uF 25V
C1125
DC_DIM
+5V_MULTI
0
READY
R1191
+2.5V_VDDM_MST
3.3K
1%
R1166
+5V_ST
365
1%
R1137
0.1uF
C1115
0.1uF
C1136
0
R1132
100uF
16V
C1110
AZ1117H-ADJTRE1(EH11A)
IC1103
2
OUTPUT
3
INPUT
1
ADJ/GND
+5V_ST
12K
R1110
100uF
16V
C1105
0.01uF
C1144
+12V
4.7K
R1122
NOT SHARP 32&52",AUO
P_12V
220uF
16V
C1138
0.1uF
C1142
100uF 16V
C1149
0
R1115
SC4215ISTRT
IC1100
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
P_5V
59K
R1111
1uF
C1124
1uF
25
V
C1126
330
1%
R1124
+5V_ST
100uF
16V
C1109
PANEL_ON
+5VST_MST
220uF
16V
C1100
100uF
16V
C1119
+5V_ST
0.1uF
C1139
+12V
0
READY
R1188
I_DIMMING
DISP_EN
P_16V
10K
R1128
51
5%
R1165
0.01uF
C1150
RL_ON
100uF
16V
C1118
AC_DET
SAM2333
D1106
READY
+5V_MULTI
100uF
16V
C1128
0.1uF
C1111
0.01uF
C1106
47
R1102
1.6K
R1131
2.2uF
25V
C1116
+5VST_MST
0.1uF
C1148
4.7K
R1138
0.47uF
C1121
E_DIMMING
2700pF 50V
C1113
MBRS190T3G
90V
D1103
+5V_TUNER
0.47uF
C1114
NOT SHARP 52",AUO
P_16V
0.01uF
C1108
+5V_ST
10K
R1129
0.01uF
C1146
100uF
16V
C1141
1K
R1192
0.1uF
C1112
+3.3V_MST
P_12V
10K
R1184
MBW3216-501TF
L1100
+16V_NTP
RT1C3904-T112
Q1100
E
B
C
2SC3875S
Q1102
1
2
3
RT1C3904-T112
Q1107
E
B
C
RT1C3904-T112
Q1106
E
B
C
SMAW200-24C
P1100
19
Power ON
14
GND
9
5V
4
GND
18
ACD
13
GND
8
GND
3
GND
17
Error out
12
5V
7
GND
2
16V
16
AGND
11
5V
6
12V
1
16V
20
Inverter ON
15
GND
10
5V
5
12V
21
A.Dim
22
PWM Dim
23
Select
24
SYNC
MBR230LSFT1G
30V
D1100
5.6K
R1107
18K
R1106
33K
R1140
33K
R1141
2.2K
R1152
2.2K
R1154
2.2K
R1153
330
1%
R1194
USB
100uF
16V
C1151
USB
+5V_USB
AZ1117H-ADJTRE1(EH11A)
IC1107
USB
2
OUTPUT
3
INPUT
1
ADJ/GND
0.1uF
C1120
USB
110
1%
R1195
U S
B
1/10W
100
5%
R1139-*1
PWM_DIM
1/10W
1K
5%
R1139
DC_DIM
0
R1163
S2A
D1102
50V
10uF
C1152
4.7uF
C1117
10K
READY
R1196
0
SHARP 52",AUO
R1197
0
CMO 32,42,47
R1185
0
NOT (CMO 32,42,47,57, SHARP 32")
R1183
0
CMO 57"
R1187
0
CMO 57"
R1186
0
NOT CMO 57"
R1127
0
CMO 32,42,47,57
R1155
+5V_MULTI
0
R1105
0
NOT CMO 32,42,47,57
R1104
0
CMO 32,42,47,57
R1103
0.1uF
C1154
100uF
16V
C1153
+5V_MULTI
MBW3216-501TF
L1103
USB
0.1uF
C1130
USB
1
R1148
+3.3V_HDMI_SW
+3.3V_USB
22uF
16V
C1129
USB
+3.3V_SDRAM
0.1uF
C1156
+3.3V
10uF
16
V
C1133
TW9910 block
0.1uF
C1131
0.1uF
C1147
47uF
16V
C1145
0.01uF
C1132
0
R1149
+3.3V_MULTI_MST
47uF
16V
C1155
+1.8V
+12V
P_5V
EAM38769505
UBW2012-121F
L1104
120OHM
READY
L1108
EAM38769505
UBW2012-121F
L1105
L1107
UBW2012-121F
MBW3216-501TF
L1109
UBW2012-121F
1 20
O H
M
32
S
ha
rp
L1110
UBW2012-121F
1 20
O H
M
NOT 32 Sharp
L1111
P_5V
VCC_LCD
AZ1117H-3.3
IC1105
2
OUTPUT
3
INPUT
1
ADJ/GND
AZ1117H-3.3
IC1108
2
OUTPUT
3
INPUT
1
ADJ/GND
0
5%
R1168
0
5%
R1170
OPT
R1167
R E
A D
Y
OPT
R1169
R E
A D
Y
AZ1117H-1.8TRE1(EH13A)
IC1106
2
OUTPUT
3
INPUT
1
ADJ/GND
OPT
R1150
R E
A D
Y
0
5%
R1151
0.1uF
C1122
0.1uF
C1123
UBW2012-121F
EAM38769505
L1106
MBW3216-501TF
EAM30764101
L1112
0.01uF
C1134
22uF 16V
C1104
SI4925BDY
EBK32753101
Q1101
3
S2
2
G1
4
G2
1
S1
5
D2_1
6
D2_2
7
D1_1
8
D1_2
+5VST_MST
+5V_USB
+12V
11 11
EAX40043809
POWER
MSTAR LP81A
MSTAR
OUT:2.6V
(8)
110mA
LED Block
12V->5V_TUNER
DC-DC CONVERTER
ST 5V->3.3V->1.2V
R1
SWITCH VCC_LCD:12V or 5V
OUT:1.25V
R2
equal to 220uF pad size
5V:5V_PULLUP,5V_MULTI
OUT:UNDER 7.22V
SWITCH 5V->3.3V->1.8V
20mA
SWITCH 5V->DDR 2.5V
MAX 1A
MAX 1A
MAX 1A
R2
R1
R1
R1
R2
R2
V0 = 0.8(R1+R2) / R2
*Applied to SIF,HDMI,ADC,MPLL,AUD
*3.3V_NTP,TW9910,ETC.
*NTP.USB,TW9910
*12V AUDIO and PANEL
*SHARP 32" : DC DIMMING
R1122
Sharp 52"
AUO
X
4.7K
O
R1197
CMO 32/42/47
O
O
CMO 57"
X
X
C1114
X
R1127
X
X
O
O
the Rest(w/CMO26")
O
O
X
4.7K
4.7K
0.47uF
X
0.47uF
0.47uF
X
R1183
O
O
X
O
R1155
O
X
X
X
X
X
X
R1185
O
R1103
O
O
X
R1186
O
X
X
X
X
X
X
R1187
O
X
X
X
X
X
O
X
X
O
O
R1104
*PANEL OPTION
X
Sharp 32"
X
X
X
X
X
O
XX
X
X
2008/01/08
SCHEMATIC DIAGRAM
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