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7-11
A
Main Board Circuit Diagram: MT8555-VFD/ IR
3.3V_STBY
U7D
U7D
DVCC33_IO_STB
J21
DVCC33_IO_STB
H21
DVCC33_IO_STB
4
3.3V_STBY
AVDD33_LDO
J24
AVDD33_LDO
H22
AVSS33_LDO
AVDD10_LDO
K21
AVDD10_LDO
C502
C502
NC
NC
DVCC33_IO_STB
C503
C503
C504
C504
NC
NC
0.1uF/16V/X7R
0.1uF/16V/X7R
3
MT8555_0825_A
MT8555_0825_A
AVDD33_LDO
C500
C500
C506
C506
NC
NC
0.1uF/16V/X7R
0.1uF/16V/X7R
{LCDRD, ETTXEN} = 0 ,
2
{LCDRD, ETTXEN} = 1 ,
{LCDRD, ETTXEN} = 2 ,
{LCDRD, ETTXEN} = 3 ,
1
A
B
H24
GPIO8
J27
J27
R491
R491
33
33
ETCOL
R492
R492
33
33
F26
ETCRS_AO2SDATA2
PDN
ETCRS
J28
ETMDC_AO2BCK
TP3
TP3
ETMDC
J26
ETMDIO_AO2MCK
TP4
TP4
ETMDIO
G26
OPEN_K
TPA15
TPA15
ETRXCLK
F25
ETRXD0
G27
ETRXD1
G28
ETRXD2
G25
POWER_K
ETRXD3
POWER_K
E25
ETRXDV_AO2SDATA3
ETRXDV
E26
ETRXER_AO2SDATA1
ETRXER
G24
MCU_INT
ETTXCLK
R607
R607
0
0
G23
SPDIF_REST
SPDIF_REST
ETTXD0
H23
R496
R496
33
33
8422_IO30
8422_IO30
ETTXD1
R495
R495
33
33
J23
8422_IO17
8422_IO17
ETTXD2
R489
R489
33
33
H26
A_SW0
ETTXD3
A_SW0
H25
ETTXEN_VOUTD14
R490
R490
33
33
A_SW1
A_SW1
ETTXEN
F24
ETTXER_AO2SDATA0
TM14
TM14
ETTXER
J25
UARXD
UARXD
K26
UATXD
UATXD
L25
VSTB
VSTB
M23
VDATA
VDATA
M24
VCLK
R516
R516
4.7K
4.7K
VCLK
L26
LCDRD
LCDRD
K25
IR
R616
R616
4.7K
4.7K
IR_OUT
IR
K23
RESET_
RESET_
K24
OPWRSB
OPWRSB
C507
C507
0.1uF/16V/X7R
0.1uF/16V/X7R
3.3V_STBY
Normal mode
RST by SVO mode
Monitor mode
R573
R573
R574
R574
Test scan mode
10K
10K
10K
10K
ETTXEN_VOUTD14
LCDRD
R577
R577
R578
R578
10K
10K
10K
10K
B
C
12
B_SW1
ADC_VRST#
12
2
TP14
TP14
TM31
TM31
MCU_INT
8
TPA16
TPA16
12
12
VSTB
12
VCLK
12
VDATA
12
3.3V_STBY
IR_OUT
8
2,8
RESET_
2
OPWRSB
pcb TOP VFD/IR Port TESET point
VDATA1
VDATA1
VDATA
VSTB1
VSTB1
VSTB
VCLK1
VCLK1
VCLK
1
1
2
2
3
3
4
4
CON2
CON2
4PIN/2.0mm
4PIN/2.0mm
C
7-11
D
E
R426
R426
NC/33
NC/33
VFD_STB
VFD_STB
VFD_STB
8
R427
R427
NC/33
NC/33
VFD_CLK
VFD_CLK
8
R428
R428
NC/33
NC/33
VFD_DATA
VFD_DATA
8
3.3V_STBY
3.3V_STBY
RU2
RU2
0
0
UARXD
C505
C505
RU1
RU1
0
0
UATXD
0.1uF/16V/X7R
0.1uF/16V/X7R
BE RS232 SW Debug JACK
D
E
4
3
2
1
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