LG 15LS1R (CHASSIS:LP68A) Service Manual ▷ View online
- 17 -
No Sound
Check the speaker wire
Change source input.
Check the
input source.
Fail
Pass
Re-solder or Change the
defect part.
Check X301.
defect part.
Check X301.
Check the input/output
of IC100
Fail
Pass
Re-solder or change the
defect part.
defect part.
Check the input/output
of IC400
Fail
Pass
Change the speaker
Check the speaker
Fail
Pass
- 18 -
BLOCK DIAGRAM
IR
d
e
te
ct
or
5V
LV
D
S
M
O
D
U
L
E
M
X
25L
400
5A
(S
e
ri
al
F
lash
)
Co
n
tr
o
l B
o
a
rd
(T
a
c
t S
w
it
c
h
)
LE
D
S
p
eaker L
e
ft
S
p
eaker R
ight
TTL M
O
D
U
L
E
15V
5V
15V
12V
_
P
a
ne
l
5V
5V
15V
LIP
S
RGB i
n
A udi
o out
A udi
o in
CVBS
in
Vide
o in
A udi
o in
Y in
C in
CVBS
ou
t
C
ont
ro
l i
n
/out
EE
P
R
O
M
(24C
64)
CV
BS
Jack
S
-V
ide
o
Jack
Ste
re
o
-I
n
(Opt
io
n)
H/
P
Out
put
LE
D / IR
/ Co
ntr
ol
Po
w
e
r
Vi
de
o
A
udi
o
Da
ta
A
ddr
e
ss
Da
ta
CL
K,
DQ
M
,
WE
Z
,C
A
S
Z
,R
A
S
Z
EE
P
R
O
M
(24C
02)
M
12L
1
616
1A
-5
T
G
(S
D
RAM
)
C
V
B
S
Tune
r
C
V
B
S
Tune
r
SC
L
/SD
A
SC
L
/SD
A
SC
L
/SD
A
SI
F
_
O
U
T
CV
BS
O
U
T
M
S
T
9
6
585
(S
c
a
le
r +
V
ideo D
e
c
oder
)
SC
A
R
T
Jack
D
-Su
b
(Opt
io
n)
RS-232C
(Option)
Rx
/T
x
C
S
4352
(D
A
C
)
3.
3V
12V
Re
gula
to
r
Re
gula
to
r
Re
gula
to
r
Re
gula
to
r
Re
gula
to
r
5V
1.
8V
LE
D
/IR
B
oar
d
Co
nt
ro
l
M
X
232A
(R
S
-232C
)
ON
/O
F
F
PWM
_
D
IM
DI
M
_
C
T
L
YD
A
1
3
8
(A
udi
o a
m
p)
Rx
/T
x
F
E
T
Swi
tch
(SI
4925B
D
Y
)
5V
12V
IF
_
V
id
e
o
- 19 -
BLOCK DIAGRAM DESCRIPTION
Power Supply Block (LIPS)
This Block Generates DC Voltage (5V,15V) to Main Control system from AC Power (100-240 V, 50/60 Hz, 1.0A)
Also it has the inverter function that converts input voltage to AC Rms value for the LCD lamp.
Also it has the inverter function that converts input voltage to AC Rms value for the LCD lamp.
Voltage Regulator
Voltage regulator convert the input 5V,15V to proper 1.8V, 3.3V, 5V, 12V for
Main control system.
For shooting heat trouble, we use the voltage regulator IC.
Main control system.
For shooting heat trouble, we use the voltage regulator IC.
Digital Audio Amplifier
This block is composed of YDA138-EZ and peripheral device
The function of the audio amplifier is that to amplify audio L / R signal transmitted from audio decoder. The audio
signal is amplified according to pre-defined DC volume control curve.
The function of the audio amplifier is that to amplify audio L / R signal transmitted from audio decoder. The audio
signal is amplified according to pre-defined DC volume control curve.
Audio / Video Decoder / Scaler
This block is composed of LGE9655 and peripheral devices.
1) Video Decoder
This Block Selects input Video signals (like CVBS, Y/C, SCART RGB) and output LVDS/ TTL signal through
Scaler.
On decoding, We can control signal like Contrast, Brightness, Sharpness, Color, tint signals including
Adaptive Comb Filter.
Scaler.
On decoding, We can control signal like Contrast, Brightness, Sharpness, Color, tint signals including
Adaptive Comb Filter.
2) Audio Decoder
This block analyzes audio input signal through A/V Jack (and PC audio) and Tuner SIF.
The analyzed signals transmitted to audio amplifier.
On decoding, We can control signal like Bass, treble.
The analyzed signals transmitted to audio amplifier.
On decoding, We can control signal like Bass, treble.
3) Scaler
This IC includes A/D Converter and LVDS Transmitter
This IC is directly Inputted Analog Signal and transmits it to LCD Module
This IC is directly Inputted Analog Signal and transmits it to LCD Module
4) Micom
This block controls each IC through IIC communication line.
DAC IC (CS4352)
It is composed of CS4352.
The CS4352 is a complete stereo digital-to-analog system including digital interpolation, fifth-order multi-bit
delta-sigma digital-to-analog conversion, digital de-emphasis, analog filtering, and on-chip 2 Vrms line-level
driver.
The CS4352 is a complete stereo digital-to-analog system including digital interpolation, fifth-order multi-bit
delta-sigma digital-to-analog conversion, digital de-emphasis, analog filtering, and on-chip 2 Vrms line-level
driver.
TUNER
Micom controls this through IIC Line.
TUNER makes CVBS/SIF and transmits CVBS/SIF signal to LGE9655.
Micom controls this through IIC Line.
TUNER makes CVBS/SIF and transmits CVBS/SIF signal to LGE9655.
- 20 -
EXPLODED VIEW
300
121
121
200
120
120
590
431
580
520
41
1
400
530
441
440
430
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