LG 42LC2D (CHASSIS:LD61C) Service Manual ▷ View online
- 25 -
No Audio
Push the POWER
ON key
Replace the MSP
Power error or
replace
IC605(TC74LCX157)
Power Error
Check the interfacing circuit
of
HDMI or replace STi5100
Check
the Condition
of all Connectors,
wafers, I2C In
corresponding
Signal flow?
Check the
supply voltage 8V
across L403
Check the
MUX I2S output
At R491,493,494 On
jack board
Check audio
output at MSP across
R429-431.
Check the
PWM output of
NSP across
R436-439
Check the
Amplifier output level
At L423-426
Check 18V
supply at L421
Check
3.3V supply across
L402 and 1.8V at
C448
Is the
Set ON?
Check the DTV
HDMI I2S signal at R183,
184,186 and R1218-1220
respectively according to The
corresponding mode On
main board
YES
Turn OFF the Mute
Is the
Mute ON?
Increase the Volume
Is
Volume level Of
the set?
Correct them
Replace NSP
Power Error
Replace
TAS5122(amp)
There may be some
error in Audio
source.
TROUBLESHOOTING DTV/HDMI-Audio
- 26 -
No Audio
Push the POWER
ON key
Replace the MSP
Power Error
Check the interfacing circuit
of Analog Tuner, component
and PC audio accordingly
w.r.t the mode.
Check the
Condition of all
Connectors, wafers,
I2C In corresponding
Signal flow?
Check the
supply voltage 8V
across L403
Check audio
output at MSP across
R429-431.
Check
the PWM output
of NSP across
R436-439
Check
3.3V supply across
L402 and 1.8V at
C448
Check 18V
supply at L421
Check the
Amplifier output level
at L423-426
Is the
Set ON?
Check
the RF SIF,
Component L/R and
PC L/R signal across R212,
R171-170, R505-506,
respectively according to
the corresponding
mode on jac
board
YES
Turn OFF the Mute
Is the
Mute ON?
Increase the Volume
Is Volume level
of the set 0?
Correct them
Replace NSP.
Power Error
Replace
TAS5122(amp)
There may be some
error in Audio
source.
TROUBLESHOOTING RF/Component/PC
BLOCK DIAGRAM(Main)
- 27 -
TDFB-G236P
DVB/PAL
8b
it(656),27M
Hz,I2S
STi5100
CI SLOT
TS IN
CI TS
74LCX244
Tuner TS
MUX
3 State Buffer
3state-control
SPDIF out
8bit(656),27M
Hz,I2S
DTV out VLR
FFC Wafe
r
FFC Wafer
FFC Wafer
Cortez
Hudson
Sub V/YC
Main V/YC
8Pin Reco
rd
PC_RGB
Comp YPbPr
Scart
RG
B
Sil9012
TMDS Rx
(HDCP)
HDMI
8bit
SPDIF OUT
24bit
24bit
SPDIF out DTV
SPDIF out MSP
24bit
24bit
DTV out VLR
LVD
S_31P
LCD : 1
0bit, AI,
PWM,
INV_
BRI
24b
it
Uartcommu
nica
tion
Uartcommu
nica
tion
24bit
PDP modul
e
D/L
SDA,SCL
Wafer
to PDP modul
e
PDF Fan
Fan Control
- 28 -
BLOCK DIAGRAM(Jack)
CXA2069Q
AUDIO/VI
D
E
O
S
W
W
MSP4410K
Sound processor
NSP-2110A
Digital s
ound
pro
cessor
VLR
TV_out V
SCART RGB
VLR, YC
DTV V_out
MNT_VLR
PC_RGB
YPbPr
Co
mp
onent Ja
ck
Audio_LR
WIRE_IR_in
WIRE_IR_out
Audi
o out
CVBS
Audio
TV_out L
R
I2S
Digital AMP
I2S DTV/HDMI
Main V/YC
AV_LR
AV1
DTV out
AV2
RGB
audio
RGB i
n
IR
out
IR
In
AV3
Side AV
VLR
LR
VLR, YC
Sub V/YC
EPF LR
Audio_LR
TV_LR
MSP_SPDIF
8Pin Rec ord
8Pin Rec ord
FFC Wafer
FFC Wafer
FFC Wafer
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