Circuit Descriptions
7.
7.4
Circuit Description
7.4.1
System power
The main board power is received at connector CN701 from
power board, to receive the power and signals from the PSU.
See
for the correct pining, The shown test points in
.
Table 7-1 Connector CN701 overview
Figure 7-4 System power
7.4.2
Nand flash Memory (U403)
The set uses a 256 MB NAND flash for software code
Figure 7-5 Nand flash Memory (U403)
7.4.3
NVM (U4103)
The system NVM is a 128 KB IC. It contains all system settings.
Figure 7-6 NVM (U4103)
7.4.4
Reset (U4101)
When the input voltage for the MT5301B main processor drops
below 2.93 V, a system reset will be enforced by U4101.
Figure 7-7 Reset (U4101)
Item
Pin
Description
1
1
INVERTER_ON_OFF, Inverter board
control (Low: ON, High: OFF)
2
2
BRIGHT_ADJ, Inverter bright PWM
control (Max.: 0 V, Min.: 3V3)
3
3, 4
+12 V Supply
4
5, 6, 7
Ground
5
8, 9
+24 V Supply
6
10
STANDBY, Standby
control (High: Normal, Low: Stand by)
7
11, 12
STB_PWR5V, +5VSB Supply
8
13
POWER OK
19190_208_110905.eps
110905
C706
10uF 10V
NC/C702
100N 50V
BL_CTRL
BRI_ADJ
+
C703
330UF 35V
R738
NC/0R05 1/16W
PWR_OK
+
C705
470UF 10V
CN701
CONN
1
2
3
4
5
6
7
8
9
10
11
12
13
R701
10K 1/16W 5%
FB702
120R/6000mA
1
2
C704
100N 50V
ZD701
NC/BZX84C3V6
1
3
+24V
H : ON
L : Standby
+
NC/C701
330UF 35V
+12V
FB703
120R/6000mA
1
2
PSU_STBY
R750
0R05 1/10W
R712
8.2K 1/10W
OPWRSB
NC/FB701
120R/6000mA
1
2
5VSB
19190_211_110905.eps
110905
PDD2
DVDD3V3
PDD6
PDD3
PDD5
PACLE
POOE#
U403
HY 27US08561A-TPCB
39
1
2
3
4
5
46
17
16
18
26
11
19
7
14
15
27
28
20
21
22
32
33
36
12
8
37
31
30
29
13
45
44
43
42
41
40
23
24
25
9
34
35
47
38
6
10
48
NC23
NC1
NC2
NC3
NC4
NC5
NC26
ALE
CLE
WE
NC17
NC8
WP
RY /BY 1
NC9
NC10
NC18
NC19
NC11
NC12
NC13
I/O3
NC20
VSS2
VCC1
RE
VCC2
I/O2
I/O1
I/O0
VSS1
NC25
I/O7
I/O6
I/O5
I/O4
NC24
NC14
NC15
NC16
CE1
NC21
NC22
NC27
PRE
NC6
NC7
NC28
PDD0
PDD1
PAALE
C4109
100N 16V
DVDD3V3
DVDD3V3
PDD4
PDD7
R4117
4K7 1/16W 5%
C4108
100N 16V
PARB#
DVDD3V3
POWE#
C4110
10uF 10V
FLASH_WP#
POCE1#
R4115
4K7 1/16W 5%
19190_212_110905.eps
110905
U4103
CAT24C128Y I
4
8
5
6
1
2
3
7
VSS
VCC
SDA
SCL
E0
E1
E2
WC
R4105
2.
7K 1/
16W
1
%
R4103
10K 1/
16W
5
%
DVDD3V3
I2C address at A0
R4104
2.
7K 1/
16W
1
%
H: Write Enable
R4106
2.2K 1/16W
C4104
220N16V
OSCL0
R4109
10K 1/16W 5%
Q4101
PMBS3904
L: Write Protect
MEMORY _WP#
OSDA0
19190_213_110905.eps
110905
R4110
NC/100K 1/16W
C4123
NC/10P 50V
R4108
0R05 1/16W
R4111
NC/820R 1/10W 1%
R4139
0R05 1/16W
C4107
100N 16V
R4112
NC/1K8 1/10W 1%
R4140
NC/5K1 1/16W 5%
ORESET#
3V3SB
U4101
MAX809STRG
1
2
3
GND
RE
S
ET
VCC
3V3SB
5VSB