Service manual

ViewSonic Corporation Confidential - Do Not Copy VA902-3_VA902b-3
5
23 1152 x 870 @ 75Hz, 68.7kHz Yes
24 1280 x 1024 @ 60Hz, 63.4kHz Yes
25 1280 x 1024 @ 75Hz, 79.97kHz Yes
26 1280x 720 @ 60Hz, 45kHz (HDTV) Yes
Changing Modes
Maximum Mode Change Blank Time for image
stability. Note:
1) Excluding “Auto Adjust” time
2) Under DOS mode (640 x 350, 720 x 400 & 640 x
400), there is no “Auto Adjust” feature.
3) The monitor needs to do “Auto Adjust” the first
time a new mode is detected.
Under 5 seconds (Maximum)
1 seconds (Typ.) for recognized timings
1-2 seconds (Typ.) for unrecognized timing
5. LCD Panel
Panel Characteristics
Souce1:
Panel Type HSD190ME13-A02
Type TN type with LVDS interface
Active Size 376.32 (H) x 301.056 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
# of Backlights 4 CCFL edge-light (2 top / 2 bottom)
Backlight Life 40,000 Hours (minimum)
Panel Performance
Luminance –
Condition:
CT = 6500K, Contrast = Max,
Brightness = Max
250 cd/m2 (typ. after 30-minute warm-up)
Brightness Uniformity ≥80% Entire Area(Typ)
Contrast Ratio 600:1 (typ.), 450:1 (minimum)
Color Depth 16.2M colors (6-bits+2 bits FRC)
Viewing Angle (Horizontal) 140 degrees @ CR>10
Viewing Angle (Vertical) 130 degrees @ CR>10
Response Time
10%-90% @ Ta=25°C
8ms(Typ.)
Source2:
Panel Type HSD190ME13-A16
Type TN type with LVDS interface
Active Size 376.32 (H) x 301.056 (V)
Pixel Arrangement RGB Vertical Stripe
Pixel Pitch 0.294 mm
# of Backlights 4 CCFL edge-light (2 top / 2 bottom)
Backlight Life 40,000 Hours (minimum)
Panel Performance
Luminance –
Condition:
CT = 6500K, Contrast = Max,
Brightness = Max
300 cd/m2 (typ. after 30-minute warm-up)
Brightness Uniformity ≥80% Entire Area(Typ)
Contrast Ratio 700:1 (typ.), 450:1 (minimum)
Color Depth 16.2million colors (6 bits+2bits data)
Viewing Angle (Horizontal) 150 degrees @ CR>10
Viewing Angle (Vertical) 135 degrees @ CR>10
Response Time
10%-90% @ Ta=25°C
8ms (Typ.)