ViewSonic VA1930wm-1 Service Manual page 36

8 After repair, to ensure the quality you should do the following test and adjustment
Item
1.Signal is set as 1280x1024@60Hz
2. LCM button are from left to right, checking whether each single
Test OSD function
function key and compound function key can be worked.
1. Set input mode to 1280x1024@60Hz
2. Set Pattern to 32 gray shades
Contrast Check
3. Set contrast to the max. The brightest 6~8 shades brightness cannot
be distinguished.
1. Do "Auto color" at 640 x 480@60Hz, 5-Mosic pattern
2. Measure color temperature, check it complies with the following
temperature:
Color Temperature
1. Use Chroma Pattern Generator to make sequence.
VESA (640x480 800x600 1024x768 1280x1024), MAC 832x624
DOS (640x350 720x400), the detail supported modes and power
Modes switching
saving signal.
check
2. Confirm the above timing modes must be full screen and the
picture must be normal.
3. LED is Orange at power saving mode.
1. Set brightness to default value 100 and contrast to default value
Y measurement at
default setting
2. At full white patter, Measure Y, which should be ≥ 250cd/m²
1. Mode: 1440x900@60Hz
2. Set Brightness& contrast to default value
Panel Flicker
3. Do "Auto Image Adjust"
4. Shut down PC to check whether there's glitter on the center of the
check
1.
2.
3.
4.
5.
Power saving
Normal
Stand By
Power Key Off
ViewSonic Corporation
5400K x=0.335 +/- 0.02, y=0.350 +/- 0.02
6500K x=0.313 +/- 0.02, y=0.329 +/- 0.02
7500K x=0.299 +/- 0.02, y=0.315 +/- 0.02
9300K x=0.283 +/- 0.02, y=0.298 +/- 0.02
70 at 6500K
picture.
Mode: 1440x900@60Hz
Pattern: full white
Brightness: Max.
Contrast: Default
Check power consumption at each modes
State Power Consumption
Content
LED color
≤ 42W Green
< 2W Orange
No
＜1Ｗ
Confidential - Do Not Copy
33
Equipment
Chroma
Signal Generator
Chroma
Signal Generator
Chroma Signal
Generator and color
analyzer
Chroma Signal
Generator
Chroma Signal
Generator and Color
Analyzer
Equipment::
Chroma Signal
Generator & PC
Chroma signal
generator and Power
meter
AC input: 230V/50Hz
VA1930wm-1