Service manual

5
ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2
Video Signals Video RGB (Analog) - Separate
Video Impedance 75 Ohms (Analog)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
DDC 1/2B Compliant with Revision 1.3
Sync Compatibility Separate Sync
Video Compatibility
Shall be compatible with all PC type computers,
Macintosh computers, and after market video cards
Resolution Compatibility
640 x 350, 640 x 480, 720 x 400 (640 x 400), 800 x
600, 832 x 624, 1024 x 768
Exclusions Not compatible with interlaced video
4 POWER SUPPLY
Internal Power Supply
Part Number: ILPI-019
Input Voltage Range 90 TO 264 VAC
Input Frequency Range 47.5 TO 63 HERTZ
Short Circuit Protection Output can be shorted without damage
Over Current Protection 5 A typical at 14 VDC
Leakage Current 3.5 mA (Max) at 254VAC / 60Hz
Efficiency 80 % typical at 115VAC Full Load
Fuse Internal and not user replaceable
Power Dissipation 23 Watts (max)
Max Input AC Current 1.2 Arms @ 100VAC, 0.6 Arms @240VAC
Inrush Current (Cold Start) 40A @ 120 VAC, 60 A(max) @ 220 VAC
Power Supply Cold Start
Shall start and function properly when
under full load, with all combinations of
input voltage, input frequency, and
operating temperature
Power Supply Transient Immunity
Shall be able to withstand an ANSI/IEEE
C62.41-1980 6000V 200 ampere ring wave
transient test with no damage
Power Supply Line Surge Immunity
Shall be able to withstand 1.5 times
nominal line voltage for one cycle with no
damage
Power Supply Missing Cycle Immunity
Shall be able to function properly, without
reset or visible screen artifacts, when ½
cycle of AC power is randomly missing at
nominal input
Power Supply Acoustics
The power supply shall not produce audible
noise that would be detectable by the user.
Audible shall define to be in compliance
with ISO 7779 (DIN EN27779:1991) Noise
measurements of machines acoustics.
Power Switch noise shall not be considered
US Type Power Cable
Length = 1.8m. Connects to AC/DC Power
Color = Black
Power Saving Operation(Method) VESA DPMS Signaling
Power Consumption
ON Mode < 23 W (max)
POWER SAVING < 2W ,OFF < 1W
Recovery Time On Mode = N/A, Active Off < 3 sec