Sharp LC-28HM2E (serv.man3) Service Manual ▷ View online
53
LC-28HM2
AN-28SP2
Æ
Major functions and pin allocations
1
Decoder IC (IC4001)
Pin No.
Name
I/O
Function
44
DDCK
O
Video reference dot clock (Approx. 40MHz)
46
DE
O
Video display data field
47
Vsync
O
Vertical sync signal (60Hz)
48
Hsync
O
Horizontal sync signal (48.36kHz)
2
Panel control G/A (IC4302)
Pin No.
Name
I/O
Function
39
Hsync
I
Horizontal sync signal (48.36KHz)
41
Vsync
I
Vertical sync signal (60Hz)
43
DE
I
Video display data field
44
ICLK
I
Video reference dot clock (Approx. 40MHz)
91
REF_CLK
I
G/A operation reference clock (40MHz)
105
RST
I
Reset (Active Hi)
116
DATA_W
I
Microprocessor transmission terminal (Data)
117
MCLK
I
Microprocessor transmission terminal (Clock)
118
PCS
I
Microprocessor transmission terminal (Select)
113
OFL1
O
Lamp brightness control signal
119
REV
O
Common drive signal
120
REVV0
O
Gradation control power drive signal
134
GLBR
O
Vertical scan switch signal (Normal Hi)
136
GSP2
O
Gate drive start signal (Either one output based on GLBR)
137
GSP1
O
138
GCK
O
Gate clock
139
POWER
O
Gate drive signal
181
OCK
O
Pixel clock (Identical to ICLK)
192
SPLS
O
Source drive sampling start signal
231
SPRS
O
(Either one output based on LBR)
234
LS
O
Source drive latch signal
235
LBR
O
Horizontal scan switching signal
54
LC-28HM2
AN-28SP2
6
5
4
3
2
1
A
B
C
D
E
F
G
H
BLOCK DIAGRAM (DISPLAY)
3.3V
5V
-7.5V
-14V
30V
13V
9V
J4001
System
connector
Video
Control
A
udio
IC4001
Decoder
R.G.B
IC4302
LCD
controller
IC2011
EEPR
OM
IC2005
Reset
IC2004
Microprocessor
IC1120
IC1121
D/A con
v
e
rter
IC2013
D/A con
v
e
rter
IC1304
Sound
processor
100V
100V
100V
Main
s
witch
A
C/DC
in
v
e
rter
Bac
klight
Q2
s
witch
13V
DC/DC
IN
OUT
LCD panel
BOSE
speak
er
with b
uilt-in
AMP
Lch
BOSE
speak
er
Rch
13V
P
o
w
er
supply f
or
speak
er
AMP
5V
(Main po
w
er supply
for microprocessor)
Control
Control
Control
Gr
adation
control
po
w
er
for LCD
IC1101-
IC1124
55
LC-28HM2
AN-28SP2
6
5
4
3
2
1
A
B
C
D
E
F
G
H
BLOCK DIAGRAM (AVC SYSTEM)
5V
2.5V
3.3V
12V
16V
5V
Video 1
input
Video/A
udio
Video/A
udio
Video/A
udio
Video
A
udio
Video
A
udio
Video
A
udio
Video
A
udio
Video
Video/A
udio
A
udio
Video 2
input
Headphone
output
IC301
sound
processor
Video
3
input/
output
Video 4
component
input
PC
input
D
ter
minal 1
input
D
ter
minal 2
input
UV RF
input
BS RF
input
Detection
AFC input
Bit stream
TU3201
UV tuner
TU9001
BS tuner
IC410
audio
s
witch
IC3901
m
ultiple
sound
IC7201
A
uto-wide
IC401
input
s
witch
IC1901
Sync
separ
ation
IC7001
3D Y/C
IC801
Video
encoder
IC415-417
Video
s
witch
IC403-405
Video
s
witch
IC1
Main
microcomputer
IC35
RAM
IC38
RAM
IC39
RAM
IC25
I/P con
ve
rsion
Fr
ame
con
ve
rsion
IC20
gmZ3
IC4
AD
con
v
e
rter
SC1406
System
connector
IC50
RAM
IC51
RAM
IC48
OSD
IC29
Timing
compression
IC5
Encoder
SMPO
W
100V
100V
SW line
filter
IN
OUT
A
C/DC
56
LC-28HM2
AN-28SP2
6
5
4
3
2
1
A
B
C
D
E
F
G
H
PRINTED WIRING BOARD BLOCK DIAGRAM (DISPLAY)
Æ
PWB Block Diagram (Display)
Æ
Main Unit
HIGH
VOLTAGE
BLOCK
VOLTAGE
BLOCK
MAIN UNIT
BOSE
AMP
AMP
POWER
UNIT
DC/DC
UNIT
UNIT
POWER
SUPPLY
SUPPLY
H. V.
CONDENSER
CONDENSER
H. V.
CONDENSER
CONDENSER
110-120V/220-240V
INVERTER
GND
UNIT
GND
UNIT
SYSTEM
SPEAKER
SPEAKER
INVERTER
GND
UNIT
GND
UNIT
SYSTEM CONNECTOR
DC/DC power output
SOUND BLOCK
LAMP ERROR
DETECT BLOCK
REFERENCE
VOLA TGE
BLOCK
FPGA ROM
LCD panel control
G/A
G/A
Crystal
MPU OSC
Picture decorder
P2001
Remote control
DC Voltage
Picture(digital)
Audio(analog)
SIGNAL
AMP PWB
Control key INPUT
Gate Connector
Buffer f or source
Buffer f or source
Buffer f or source
Buffer f or source
Buffer f or source
Buffer f or source
MPU for dis play
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