LG 20HIZ20 (CHASSIS:LP69F) Service Manual ▷ View online
- 17 -
BLOCK DIAGRAM
IR
d
e
te
ct
or
5V
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
Speaker
Output
RS232C
L
E
D
/ IR
/ C
o
n
tr
o
l
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
MX232A
TPA6011A
(Audio amp)
(RS232C)
M
1
2L
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
Rx/Tx
Rx/Tx
12C(SDA/SCL)
8 ohm/1W
/Mono
BTL output
SI
F
_
O
U
T
CV
BS
O
U
T
LGE9689AD-LF-1
(S
c
a
le
r +
V
ideo D
e
c
oder
+Audio Processor)
SC
A
R
T
Jack
D
-Su
b
(Service)
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
ON
/O
F
F
PWM
_
D
IM
DI
M
_
C
T
L
YD
A
1
3
8
(A
udi
o a
m
p)
Clock Board
F
E
T
Swi
tch
(SI
4925B
D
Y
)
5V
12V
CVBS_
V
id
e
o
- 18 -
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.
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.
TUNER
Micom controls this through IIC Line.
TUNER makes CVBS/SIF and transmits CVBS/SIF signal to LGE9689.
TUNER makes CVBS/SIF and transmits CVBS/SIF signal to LGE9689.
- 19 -
MEMO
- 20 -
EXPLODED VIEW
300
121
121
120
120
570
591
590
200
210
580
210
520
41
1
413
440
441
430
530
412
400
434
431
432
433
550
410
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