NEC MultiSync LCD1550ME Service Manual page 125

SCHEMATIC DIAGRAM INTERFACE PWB (1/5) (MICROCONTROLLER/KEY FUNCTION)
VCC
C301 1000uF/10V
0.1uF
C302
I301
1 8
NC NC
2 7
NC VCC
3 6
NC RST
4 5
GND DLY
I303
C303
M51953A NC7SZ04
47nF
GND GND
P303
VCC
HEADER 4
R305 100
1
2
3
R306 100
4
C306
GND
VCC 100pF
C308 0.1uF
1 8
A0 VCC
2 7
A1 WP
3 6
A2 SCL
4 5
VSS SDA
24LC32 C314
I304
NC
GND
GND
VCC
C320
0.1uF
I305
R320 NC7SZ08
GND
4K7
1
4
HCLK
2
GND
R322
GND
3,4,5 VCC
VCC
Reset Time 13.67 ms@ DCV 4.76
RESETn
VCC
HDATA0
HDATA1
3 5
HDATA2
HDATA3
C305
HCLK
0.1uF
HFS
GND
RST
IRQ
SDA
SCL
C307
100pF
R307 10K
10K
R308
R309 4K7
4K7
R310
100
R315
R316 100
C315
NC
I306A
HFS
98 113
HFS MFB0
103 112
HCLK MFB1
HDATA0
99 111
HDATA MFB2
RESETn
100 110
RESETn MFB3
IRQ
101 109
IRQ MFB4
HREF
115 107
OSD-HREF MFB5
VREF
116 106
OSD-VREF MFB6
OSD-CLK
117 105
OSD-CLK MFB7
104
MFB8
DATA0
118 102
OSD-DATA0 MFB9
DATA1
119 124
OSD-DATA1 MFB10
DATA2
120 123
OSD-DATA2 MFB11
4K7
121
OSD-DATA3
FSW
122
OSD-FSW
gmZAN1
HREF
VREF
4 OSD_VS
DATA0
DATA1
DATA2
FSW
SDA R362
3 SDA
SCL R363
3 SCL
RN301
MTV312M64
I302
10Kx4
17
P1.0
18
P1.1
20
P1.2
21
P1.3
22
P1.4
23
P1.5
24
P1.6
25
P1.7
7
RST
29
HSCL/P3.0/RxD
28
HSDA/P3.1/TxD
19
P3.2/INT0
13
ISDA/P3.4/T0
14
ISCL/P3.5/T1 P6.2/AD2/HLFHI
36
VBLANK/P4.0
37
HBLANK/P4.1
15
STOUT/P4.2
43
HSYNC
44
VSYNC
12
XTAL1
C312 C313 11
XTAL2
22pF 5pF
5
NC
6
NC
1 2
TCLK 3
X301 20MHz
Ampl 3.3 Vpp
RN303
4K7X4
MFB0
1
MFB1
2
MFB0 MFB2
3
MFB1 MFB3
4
MFB2
MFB3
MFB4 MFB4 R321
MFB5
MFB6
HDATA1
HDATA2
HDATA3
MFB10
MFB11
RN304
4K7X4
MFB10
1
MFB11
2
MFB6
3
MFB5
4
10-1
R364 NC
R365 NC
R366 NC
5
HREF VDD2
10
VREF
VDD1
C459 OSD-CLK
2
OSD-CLK
NC
VSS2
13
B
14
G VSS1
15
R
11
HTONE
12
FBKG SSB
NC
7
SDA
8
SCL
NC
C460
C461
NC NC
NC I311
3
IIC_EN 3
DA0/P5.0
INV_EN
2
INV_EN 5
DA1/P5.1
BRI
1
BRI 5
DA2/P5.2
42
DA3/P5.3
41
DA4/P5.4
40
DA5/P5.5
34
DA6/P5.6
35
DA7/HCLAMP
39
DA8/HLFHO
38
DA9/HALFV
27
P6.0/AD0
26
P6.1/AD1
16
9
P6.3/AD3
30
P6.4/DA10 VCC
31
P6.5/DA11 R358 4K7
LED_GREEN
32
P6.6/DA12
LED_AMBER
33
P6.7/DA13
8
VDD
4
VDD3
C311
+
C310 0.1uF
10uF
10
VSS
Q301
GND
SST2222A
CVDD0 3,4,5
CVDD0
R317
470
R319
RN302
10K
10KX4
C318
0.1uF
GND
8
7
6
5
4K7
CVDD0
C321 C322
10nF 10nF
C325 C326
10nF 10nF
8
7
R327 0
6
5
GND
FB333
NC
2 1
VCC
9
4
C462 C463
NC
NC
16
R367
1
VSS NC
3
NC
6
PWR_OFF 6
MUTE 6
VOL 6
DDC-GND 3
VCC
R312
R313 R314
R311
4K7
4K7 NC
NC
Q302
C317
C316
SST2222A
4.7uF/25V
4.7uF/25V
R318
470
GND GND
C319
0.1uF
GND GREEN
1
AMBER
2
POWER
3
RESET
4
PROCEED
5
RIGHT
6
UP
7
DOWN
8
LEFT
9
EXIT
10
11
12
P304
HEADER 12
C323 C324
10nF 10nF
C327 C328
10nF 10nF
GND