LG 26LC2R / 32LC2R (CHASSIS:LP61C) Service Manual ▷ View online
5. No Sound
(1) Symptom
1) Front LED is Green
2) The Set display a screen, but a sound doesn’t output
2) The Set display a screen, but a sound doesn’t output
(2) Check process
1) Speaker part
2) Main board part
- 25 -
Yes
No
Yes
No
No
No
No
Are Speaker Cables Good?
Is sound at HDMI
Good?
Good?
Is EDID download
good?
good?
Download EDID
data once more.
data once more.
Yes
Is IC401 good?
(AD9381)
(AD9381)
Exchange IC401
No
No
No
No
No
Is sound at
Scart1/2 (or
Component2)RGB,
or Side AV Good?
Scart1/2 (or
Component2)RGB,
or Side AV Good?
Are good some
elements (C, R, L,
or Diode) at Sound
path?
elements (C, R, L,
or Diode) at Sound
path?
Is IC800 good?
(Switching IC)
(Switching IC)
If it dead or short,
exchange this
elements
exchange this
elements
No
No
Is sound at RF, AV,
or Component1
Good?
or Component1
Good?
Are good some
elements (C, R, L,
or Diode) at Sound
path?
elements (C, R, L,
or Diode) at Sound
path?
If it dead or short,
exchange this
elements
exchange this
elements
Yes
Yes
Is IC601 good?
(VCT-P)
(VCT-P)
Exchange IC601
Is IC801 good?
(Amplifier)
(Amplifier)
Exchange IC801
Yes
Exchange IC800
Exchange the cable
Insert the cable exactly
Are Speaker units good?
Are Speaker Cables
connect normally?
connect normally?
6. Display the screen abnormally
(1) Symptom
1) Display the screen abnormally at specific mode
(2) Check process
1) Noise appears at RF mode.
- 26 -
Are input voltage, I2C,
and CVBS output good?
and CVBS output good?
No
No
Is the Tuner part good?
Is the Tuner cable
connected well?
connected well?
Insert the cable exactly
Add the Gasket
No
Exchange the Tuner
Re-assemble the SET
Is Gaskets added well?
Yes
No
No
Yes
7. No picture
(1) Symptom
1) Some mode doesn’t display.
2) Front LED is green
3) The set still discharge a little
2) Front LED is green
3) The set still discharge a little
(2) Check process
1) RF-mode doesn’t display
2) AV/Component-mode doesn’t display
3) RGB/HDMI-mode doesn’
- 27 -
Yes
Yes
Yes
Yes
No
No
No
No
No
Is the LVDS cable
connected?
connected?
Is the Tuner cable
connected?
connected?
Are good some
elements (C, R, L,
or Diode) at path?
elements (C, R, L,
or Diode) at path?
Are input voltage,
I
I
2
C, and CVBS
output good in
Tuner?
Tuner?
Is VCT-P IC good?
Insert the LVDS
cable exactly
cable exactly
Insert the Tuner
cable exactly
cable exactly
If it dead or short,
exchange this
elements
exchange this
elements
Yes
Yes
No
No
No
Is the LVDS cable
connected?
connected?
Are good some
elements (C, R, L,
or Diode) at path?
elements (C, R, L,
or Diode) at path?
Insert the LVDS
cable exactly
cable exactly
Is VCT-P IC good?
Exchange the
VCT-P IC
VCT-P IC
If it dead or short,
exchange this
elements
exchange this
elements
Exchange the
Tuner
Tuner
Exchange the
VCT-P IC
VCT-P IC
Yes
Yes
Yes
Yes
No
No
No
No
Is the LVDS cable
connected?
connected?
Check the EDID
data
data
Is AD9381 good?
(only _ HDMI)
(only _ HDMI)
Are good some
elements (C, R, L,
or Diode) at path?
elements (C, R, L,
or Diode) at path?
Is VCT-P IC good?
Insert the LVDS
cable exactly
cable exactly
No
Download the
EDID data
EDID data
If it dead or short,
exchange this
elements
exchange this
elements
Exchange AD9381
IC
IC
Exchange the
VCT-P IC
VCT-P IC
BLOCK DIAGRAM
- 28 -
P600(LPL)
LVDS_J
AE
P602(CMO)
LVDS_J
AE
LVDS
TXD/RXD
12S
TV_L/R
MNT_L/R
H/P_L/R
SPK_L/R
HDMI
12S
VS
A
UDIO DELA
Y IC
MAD4868a
V
GA_R/G/B/
DS_HS/VS
R / G / B
COMP2 L/R
COMP1 L/R
COMPONENT 2
COMPONENT 1
A
V3 (REAR A
V
)
MNT out
SC 1/2_L/R
COMP2_L/R
PC_A_L/R
SIDE_L/R
REAR
Y / C
S-VIDEO
HS /
VS
9V
5V
TJ/MJ
IC602
74A
CT253SC
V
GA_R/G/B HS
V
-IN
[RGB H8
8V1_RGB
(COMP02)
COMP 1
8IDE-V
REAR-Y/C
8C2_Y/C/V
8C1_V
REAR_V
TV_V]
A
UDIO_IN
A
UDIO_OUT
(TV_L/R OUT
W
O
T_L/R OUT
H/P
A
V_A
UDIO_L/R.
CO
WP1.REAR.
BECA
W
-L-W
O)
SC 1_R,G,B
,FB
(COMP 2
Y
,PB
,PR)
COMP 1
Y
,PB
,PR
SIDE_V
SC 2_V
,
YIN, C
REAR_V
TV_V
REAR Y/C
IC601
VCT6973
SC 1_V
A
V_A
UDIO
_L/R
IC800
A
UDIO SWITCH
TEA STM
HDMI_VS/HS
V
GA_HS/VS
DS_
H/V
R/G/B/FB
V/L/R in
TV_L V/R out
MNT_V/L/R out
V/L/R in
Y/C
V
GA_
HS/VS
IC301
74HC14D
A
V1 (FULL)
A
V2 (HALF)
WIRED
IR
PC
A-IN
RS-232C
HDMI
V
AR.A
UD
.OUT
PDP D/L
RF INPUT
COMP 2
Y
,PB
,PR
COMP 1
Y
,PB
,PR
V / H
PC_A_L/R
TX/RX
H/P_L/R
RF
A
A
V4 (SIDE A
V
)
SIDE_V
SPK
SPK_L/R
19V
3.3V
IC401
TMDS RX
AD9381
1.8V
5V(Ready)
TP
A3100D2
IC801
AMP
10W
10W
SIDE_L/R
R,G,B
8bit
P603(A
UO)
LVDS_J
AE
P601(PDP)
J
AE STRAIGHT
TUNER
TU1
A-OUT
V
-OUT
GND
33V
5V
SIF
SD
A
SCL
AFT
AS
+B
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