Service manual

ViewSonic Corporation Confidential - Do Not Copy VA903b-1_ VA903m-1
17
RED- AI 38 Analog input ground from RED channel
ADC_GND AG 39 Analog ground
ADC_GND AG 40 Analog ground
ADC_VDD AP 41 Analog power (3.3V)
AHS AI 42 Analog HS input (10), (4), (5)
AVS AI 43 Analog VS input (2), (4), (5)

PLL: 8 pins
Name
I/O
Pin No Description Note
XO AI 1 Reference clock output
XI AO 2 Reference clock input
DPLL_GND AG 3 Ground for digital PLL
DPLL_VDD AP 4 Power for digital PLL (3.3V)
APLL_VDD AP 5 Power for multi-phase PLL (3.3V)
PLL_TEST1 AIO 6 Test Pin 1 / IRQ#
PLL_TEST2 AIO 7 Test Pin 2/Power-on-latch for crystal out
Frequency
APLL_GND AG 8 Ground for multi-phase PLL
 Control Interface: 7 pins
Name I/O Pin No Description Note
SDIO [0] IO 54 Serial control I/F data in / Parallel port
data [0]
(2), (3), / 2mA
SDIO [1] / TCON [4] /
BBLU [0]
IO 53 Parallel port data [1] / TCON [4] / TTL
BBLU [0]
(1), (2), (3), / 2mA
SDIO [2] / TCON [3] /
BBLU [1]
IO 52 Parallel port data [2] / TCON [3] / TTL
BBLU [1]
(1), (2), (3), / 2mA
SDIO [3] / PWM2 /
TCON [2]
IO 51 Parallel port data [1] / TCON [4] / PWM2 (1), (2), (3), / 2mA
SCLK I 50 Serial control I/F clock (2), (3), (5)
SCSB I 111 Serial control I/F chip select (2), (3), (5)
RESET O 56 RESET output for Micron (2), (5), (6) / 2mA
 Display & TCON/VIDEO-8 Port: 54 pins
■:LVDS+RSDS+TTLO ■:RSDS+TTLO ■:RSDS+TTLIO■:TTLO ■:TTLIO
Pin
NO.
6-bits
Dual RSDS
6 bits
Single RSDS
8/6 bits
Dual/Single
LVDS
8 bits
Dual/Single
TTL
6 bits
Dual/Single
TTL
Note
51 S[3] /
TCON[2] /
PWM2
S[3] /
TCON[2] /
PWM2
S[3] /
TCON[2] /
PWM2
S[3] /
TCON[2] /
PWM2
S[3] /
TCON[2] /
PWM2
(1), (2), (3)/
2mA
52 S[2] /
TCON[3]
S[2] /
TCON[3]
S[2] /
TCON[3]
S[2]
/BBLU[1] /
TCON[3]
S[2] /
TCON[3]
(1), (2), (3)/
2mA