Service manual

ViewSonic Corporation Confidential - Do Not Copy VX2245wm-1
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4-1 GENERAL specification
Test Resolution & Frequency
1680x1050 @ 60Hz
Test Image Size
Full Size
Contrast and Brightness Controls
Factory Default:
Contrast = 70%, Brightness = 100%
4-2 VIDEO INTERFACE
Analog Input Connector DB-15 (Analog), refer the appendix A
Digital Input Connector DVI-D (Digital), refer the appendix B
Default Input Connector Defaults to the first detected input
Video Cable Strain Relief Equal to twice the weight of the monitor for five minutes
Video Cable Connector DB-15 Pin out Compliant DDC 1/2B
Video Signals
1. Video RGB (Analog)
Separate, Composite, and Sync on Green
2. TMDS (Digital)
Video Impedance 75 Ohms (Analog), 100 Ohms (Digital)
Maximum PC Video Signal 950 mV with no damage to monitor
Maximum Mac Video Signal 1250 mV with no damage to monitor
Sync Signals TTL
DDC 1/2B Compliant with Revision 1.3
Sync Compatibility Separate Sync, Composite Sync, SOG
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, 1152 x 864, 1152 x 870, 1280 x 720, 1280 x
960, 1280 x 1024 , 1400 x 1050 , 1440 x 900 , 1600 x 1200, 1680
x 1050
* The image vertical size might not be full screen.
But the image vertical position should be at the center.
Exclusions Not compatible with interlaced video
POWER SUPPLY (LCD Head)
Internal Power Supply 27-D009542
Input Voltage Range 90 to 264 VAC
Input Frequency Range 47 to 63 Hertz
Short Circuit Protection Output can be shorted without damage
Over Current Protection 5.0 A typical at 12.0 VDC
Leakage Current 3.5mA (Max) at 254VAC / 60Hz
Efficiency (at 115VAC Full Load) Typical: 80%
Minimum: 75%
Fuse Internal and not user replaceable
Power Output 50 Watts (typ)
Ripple and Noise
Ripple: <3%
Noise: <1%
Max Input AC Current 1.5 Arms @ 90VAC, 0.75 Arms @180VAC
Inrush Current (Cold Start)
50 A (max) @ 115VAC
90 A (max) @ 230VAC
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 defined to be in