LG 42LT560H-CA (CHASSIS:LJ2AC) Service Manual ▷ View online
- 17 -
6. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
R884,R888 I2C Signal
Check JK801, JK802, JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
Check HDCP EEPROM(IC103)
Power & I2C Signal
Replace the defective IC.
ok
No
Replace Jack
Check HDMI Signal
Check other set
If no problem, check signal line
ok
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
Replace Main Board
No
Check HDMI_DET(HPD)
No
ok
Replace R830,R828,R862
- 18 -
7. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P501
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC501)
ok
No
Check Connector & P501
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC501) Power
24V, 3.3V
No
Replace Amp IC(IC501)
Check Mstar I2S Output
IC501 9,10,11 Pin
No
Check signal line. Or replace Mstar(IC101)
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R140, R141
No
Check signal line. Or replace Mstar(IC101)
8. Digital TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check TS Signal
TU3703 20/27 Pin
Replace IC3703
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
- 19 -
9. Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check CVBS Signal
TU3703 8 Pin
Replace IC3703 .
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
10. AV Audio
Check AV Cable for damage
for damage or open conductor
Check JK1700Signal Line
R1705,R1706
ok
ok
No
Replace Jack(JK1700)
Follow procedure
‘8. All source audio’
trouble shooting guide.
- 20 -
BLOCK DIAGRAM
R
G
B
P
C
R
JP
H
D
M
I2
H
D
M
I1
Fu
ll
Fu
ll
N
IM
N
IM
(C
A
N
)
(C
A
N
)
R
S-
23
2C
P
ar
al
le
l T
S
TU
_C
VB
S
S
IF
S7
LR
M
A
X3
23
2
SE
R
IA
L
FL
A
SH
M
XI
C
(8
M
B
IT
)
M
X2
5L
80
06
EM
2I
-1
2G
LV
D
S
80
M
H
z
(6
0H
z/
12
0H
z/
H
D
/F
H
D
)
A
. A
M
P
N
TP
75
00
U
SB
2.
0
D
P
/D
M
SP
K
L
/R
X
-t
al
2
4
M
H
z
51
P
I2
S
R
JP
L/
R
TM
D
S
R
G
B
/H
/V
R
S
23
2C
Rear
TM
D
S
D
D
R
2
A
dd
.
D
D
R
2
D
at
a
S
P
I
A
V
Sid
e
N
A
N
D
F
la
sh
(2
G
B
IT
)
H
Y2
7U
F0
82
G
2B
T
PC
B
P
C
M
_A
[0
:7
]
TM
D
S
H
D
M
I3
C
V
BS
, L
/R
D
D
R
3
2G
H
yn
ix
H
5T
Q
2G
63
B
FR
-H
9C
66
7M
H
z
A
T2
4
C
2
5
6
C
-S
S
H
L-T
25
6K
B
IT
I2
C
30
P
IR
ou
t-P
at
h
D
D
R
3
1G
H
yn
ix
H
5T
Q
1G
63
D
FR
-H
9C
66
7M
H
z
14
8.
5M
H
z
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