LG 22LN4060 (CHASSIS:LM91P) Service Manual ▷ View online
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7. Abnormal sound (TV)-Main PCBA
Put into RF cable completely?
Abnormal sound (TV)
YES
NO
insult RF cable tight and then
Cable nut screw tight.
1
2
3
4
NO
Change Main PCBA
WAVEFORMS
Is 1.8V at 7pin of TU401?
Is I2C waveform
At 3,4pin of TU401?
Is IF waveform at 43
,44 pin of IC501?
NO
NO
3
3Pin of TU401 (SCL)
4Pin of TU401 (SDA)
4
43,44pin of IC501
If 1.7V is not at plus pin of TU401, check
It is over 3V at 2pin of IC401,
if it is not, Check Line between TU401
and IC401 is open or short.
Another is change IC401 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
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8. Abnormal sound (AV)-Main PCBA
Put into AV cable completely?
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
Is waveform at C520,C521
2
Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
C520,C521(audio in)
2
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Adaptor
Sound
AMP
NTP7513
(
(
(
(
Module
Audi
o
Ou
t
MST6841XP
5
9
4
3
10
11
Tuner SDA
Tuner SCL
TUNE
R
IF_AGC
B+
IR/KEY
40
24Mh
z
98
99
44
43
IC502
Serial Flash
8Mbyte
s
IC503
EEPROM 24C64
30
LPF
33
18
21
OP
-AMP
x4 Gain
Audio L-
Out
XX
X
39
37
38
Audio R-
Out
HDMI
SCL/SD
A
48
11
5
50
51
11
3
11
2
Audio_SCL
Audio_SDA
LV
DS
Output
P Di
m
Inv.
ON
P_S
T
3.5V
M_3.3V
TU_3.3V
12~19V
Main_1.2V
+18V
10
11
7
8
9
38
I2S_MCLK I2S_WS I2S_SCK I2S_SDO
108
11
1
11
7
IR
KEY1
Led_PWR
102
105
53
52
45
85
84
EEP
SD
A
EEP
SC
L
94
95
97
96
SPI_CLK SPI_D
I
SPI_C
Z
SPI_D
O
S_AMP_19V
32
40
LPF
USB_5V
11
0
KEY2
ST_3.5
V
P_12V
Q710
Main_1.8V
M_3.3V
Q720
AO3407A
Panel_Vcc
Main_5V
To
US
B
USB_DN
USB_DP
IF_P
IF_N
31
35
1.8V RE
G
7
TU_1.8V
19
20
Audio out
27,35,36
22,20,24,
77
62
54
41
30
18
9
11
6
107
100
101
Led_PWR
DT1641S
TPS40210
Modul
e
BLU
22”/26”
LED_28V
BLU_24V
Modul
e
BLU 24”
MP20051
1.8V RE
G
MP1472
MP1584
MP1472
+18V
Q712
To
OP_AMP
CVBS In
AV audio in
BLOCK DIAGRAM
- 19 -
A2
A31
900
200
400
540
910
120
122
300
510
502
51
1
501
800
801
LV
1
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.
IMPORTANT SAFETY NOTICE
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