ViewSonic VA502mb-1 Service Manual page 29

Fine Tune and Sharpness
Test Signal: 1280*1024@60Hz
Test Pattern: Line Moire Pattern
Check and see if the image has noise and focus performs well. Eliminate visual line bar.
If not, readjust by the following steps:
(a)Select and enter "Fine Tune" function on "Manual Image Adjust" to adjust the image to
eliminate visual wavy noise.
(b)Then, select and enter "Sharpness" function to adjust the clarity and focus of the screen
image.
Boundary
Test Signal: 1280*1024@60Hz
Test Pattern: Horizontal & Vertical Line Thickness Pattern
Check and see if the image boundary is within the screen frame.
If not, readjust by the following steps:
(a)Select and enter "Manual Image Adjust" function on OSD Main Menu.
(b)Then, select and enter "Horizontal Size" or "Horizontal/Vertical Position" function to
adjust the video boundary to be full scanned and within screen frame.
White Balance
Test Signal: 640*480@60Hz
Test Pattern: White and Black Pattern
1.5.8 R, G, B, Colors Contrast
Test Signal: 1280*1024@60Hz
Test Pattern: R, G, B, Color Intensities Pattern and 16 Gray Scale Pattern
Check and see if each color is normal and distinguishable.
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If not, please return the unit to repair area.
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Screen Uniformity and Flicker
Test Signal: 1280*1024@60Hz
Test Pattern: Full White Pattern
Check and see if it is in normal condition.
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1.5.10 Dead Pixel and Line
Test Signal: 1280*1024@60Hz
Test Pattern: Dark and White Screen Pattern
Check and see if there are dead pixels on LCD panel with shadow gauge and filter film.
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The total numbers and distance of dead pixels should be compliant with the spec.
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Mura
Test Pattern: White, RGB, Black, & Grey
Test Tool: 10% ND Filter
Check if the Mura can pass 10% ND Filter.
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ViewSonic Corporation
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VA502mb-1