LG 42LH200C / 42LH210C / 42LH220H (CHASSIS:LP91Z) Service Manual ▷ View online
- 17 -
Check the input
source
IC602 operate
normally?
Check the external
speaker
Replace the external speaker
Re-solder or replace
the IC602
Change input source.
Check the speak wire
YES
YES
YES
NO
NO
NO
Check the IR waveform
of L402
Replace the Preamp of IR ass’y.
Check the RS-232C Pin4.
9. Not operate the external speaker out
10. Not operate IR out
11. Not operate Front clock
- Direct user setting
- Setting that use TTX information
- 18 -
Check the “Clock Display”
item on SVC Menu
Is the clock
cable normal?
Check I2C line & output
of IC904
Check the LED clock
Re-solder or replace the defect part.
Replace the LED clock
Check the clock cable
Replace the “Clock display” item
from No to Yes .
Change the Clock ass’y
Check the “Time” item
on user Menu
Check the current time establishment
on “Time” item of user menu.
Check the “Clock Display”
item on SVC Menu
. Change the “Clock display” item
from No to Yes .
. Change the “PR. for TTX Clock” item
from ‘NO’ to ‘YES’
from No to Yes .
. Change the “PR. for TTX Clock” item
from ‘NO’ to ‘YES’
YES
NO
Is the clock
cable normal?
Check I2C line & output
of IC904
Check the LED clock
Re-solder or replace the defect part.
Replace the LED clock
Check the clock cable
Change the Clock ass’y.
YES
YES
YES
- 19 -
Is the supply
12V power of RJP good.
(JK900_Pin1)
Is the I2C communication good.
(IC101)
. Check the supply power.
Check the RJP &
Replace the RJP.
YES
YES
NO
NO
Check the “RJP” item
on SVC Menu
YES
Replace the “RJP” item from No to Yes.
. Check the I2C line of IC101.
NO
12. Not operate RJP
- 20 -
BLOCK DIAGRAM
LV
D
S
LGE
3
7
6
7
A
(I
C
800)
N
T
P
3
10
0L
(I
C
6
0
0
)
SP
(
R
)
SP
(
L
)
5V
_
T
U
N
E
R
EEP
R
O
M
SW
8
0
0
I2
C
_
A
_
T
U
KE
Y
1
/
2
T V
T u n e r
BO
O
S
T
E
R
SI
F
TV
_
C
V
B
S
D
S
U
B
_
R
/G
/B
P
C
_L
/
R
_I
N
COM
P
_
Y
/
P
b
/
P
r
C
O
M
P
_L
/
R
_I
N
D
S
U
B
_H
/
V
_S
Y
N
C
S
C
32
32
(I
C
200)
DDC
/
U
A
R
T-T
x
/
R
x
EEP
R
O
M
HD
M
I_
I2C
DDC_
I2
C
*
2
CE
C
TM
D
S
*
2
US
B
_
D
M
/
D
P
5V
_
H
D
M
I
IIS
MU
T
E
LE
D
_
G/
R
&
IR
LC
D
HD
/
F
HD
Pa
n
e
l
RE
S
E
T
I2
C
I/
O
E
x
p
a
n
d
e
r
(I
C
101)
I2
C_
A
_
T
U
DDR
2
M
e
m
o
ry
512M
b
it
(
IC
900)
EEP
R
O
M
S
e
ri
al
F
la
s
h
M
e
m
o
ry
128M
b
it
(
IC
8
02
)
IR
&
C
o
n
tro
l
B/
D
24C
2
56
(I
C
801)
HP
D
*
2
74L
X
1
G
14C
(I
C
1300)
Buz
z
er
(B
U
1
300)
PW
M
LE
D
C
lo
c
k
B/
D
P
IC
16F
819
(I
C
1303)
I2
C
T
P
A
3
124D
2
(I
C
1001)
EX
T
_
S
P
K
(J
K
6
0
0
)
IR
_
O
U
T
(T
o
R
S
232
J
A
C
K
)
SI
4
9
2
5
(Q
1
2
0
5
)
5V
o
r 12V
O
U
T
(T
o
R
S
2
3
2
J
A
C
K
)
On
/
O
ff
JL
C1
5
6
2
(I
C
1
0
1
)
I2
C
Co
n
tr
o
l 4
b
it
RJ
4
5
(J
K
9
0
0
)
S/
PD
IF
(J
K
7
0
5
)
Ex
t.
Vo
l C
tr
l
(J
K
602)
Au
d
io
Ou
t.
(J
K
6
0
1
)
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