Service manual
ViewSonic Corporation Confidential - Do Not Copy VA903b-1_ VA903m-1
65
9. Block Diagram
AN A LOG
RG B
Colock
GEN
Panel
Interf ace
Triple
ADC
Interf ace
Host
Interf ace
EE P ROM
AT 2 4C16
Ke y pad
AR
AG
AB
HS
VS
Au d io
Am p .
AP A 2 0 65
Cr y stal
24MHZ
LV D
S
Tr a n
sm i tt
er
Sw i tch
A0 3 401
Realte k
RTD252 3B/
RTD202 3L
3. 3 V
Di g ital
DV I
SC L
SD A
+,-,Dow n
Au t o,Ri g ht
XI N
XO U T
24 M HZ
PH D , PCLK
PH S ,PVS
RE 「7:0」,R O「7: 0」
GE 「7 :0」G O 「7:0」
BE 「7: 0」B O 「7: 0」
TX0 + TX 0-
TX1 + TX 1-
TX2 + TX 2-
17 p anel
DC
POWER
5V supply to panel
3. 3 V supp l y chip
RT D 2523 B/RTD 2023 La nd
mt v 512
Po w er
Su p ply
ON/OFF
Line
In
Sp e aker
Ou t
MCU
MTV512 64KB
XO U T
24 M HZ
Ba c klig h t
Co n trol
In v erte r
AC -IN
POWE(9 0V~264 V )
DC
POWER
Au d io(5V)
B acklight
AN A LOG
RG B
Colock
GEN
Panel
Interf ace
Triple
ADC
Interf ace
Host
Interf ace
EE P ROM
AT 2 4C16
Ke y pad
AR
AG
AB
HS
VS
Au d io
Am p .
AP A 2 0 65
Cr y stal
24MHZ
LV D
S
Tr a n
sm i tt
er
Sw i tch
A0 3 401
Realte k
RTD252 3B/
RTD202 3L
3. 3 V
Di g ital
DV I
SC L
SD A
+,-,Dow n
Au t o,Ri g ht
XI N
XO U T
24 M HZ
PH D , PCLK
PH S ,PVS
RE 「7:0」,R O「7: 0」
GE 「7 :0」G O 「7:0」
BE 「7: 0」B O 「7: 0」
TX0 + TX 0-
TX1 + TX 1-
TX2 + TX 2-
17 p anel
DC
POWER
5V supply to panel
3. 3 V supp l y chip
RT D 2523 B/RTD 2023 La nd
mt v 512
Po w er
Su p ply
ON/OFF
Line
In
Sp e aker
Ou t
MCU
MTV512 64KB
XO U T
24 M HZ
Ba c klig h t
Co n trol
In v erte r
AC -IN
POWE(9 0V~264 V )
DC
POWER
Au d io(5V)
B acklight
AN A LOG
RG B
Colock
GEN
Panel
Interf ace
Triple
ADC
Interf ace
Host
Interf ace
EE P ROM
AT 2 4C16
Ke y pad
AR
AG
AB
HS
VS
Au d io
Am p .
AP A 2 0 65
Cr y stal
24MHZ
LV D
S
Tr a n
sm i tt
er
Sw i tch
A0 3 401
Realte k
RTD252 3B/
RTD202 3L
3. 3 V
Di g ital
DV I
SC L
SD A
+,-,Dow n
Au t o,Ri g ht
XI N
XO U T
24 M HZ
PH D , PCLK
PH S ,PVS
RE 「7:0」,R O「7: 0」
GE 「7 :0」G O 「7:0」
BE 「7: 0」B O 「7: 0」
TX0 + TX 0-
TX1 + TX 1-
TX2 + TX 2-
17 p anel
DC
POWER
5V supply to panel
3. 3 V supp l y chip
RT D 2523 B/RTD 2023 La nd
mt v 512
Po w er
Su p ply
ON/OFF
Line
In
Sp e aker
Ou t
MCU
MTV512 64KB
XO U T
24 M HZ
Ba c klig h t
Co n trol
In v erte r
AC -IN
POWE(9 0V~264 V )
DC
POWER
Au d io(5V)
B acklight