ViewSonic VP720B Service Manual - Page 28

Fine Tune, Manual Image Adjust, Sharpness, Horizontal Size, Horizontal/Vertical Position - repair

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1.5.3 Firmware Test Pattern: Burn In Mode (Refer to Chapter III-3. Hot Keys for Function Controls) - Make sure the F/W is the latest version. 1.5.4 DDC Test Pattern: EDID program - Make sure it can pass test program. 1.5.5 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. 1.5.6 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. 1.5.7 White Balance Test Signal: 1280*1024@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. - If not, please return the unit to repair area. 1.5.9 Screen Uniformity and Flicker Test Signal: 1280*1024@60Hz Test Pattern: Full White Pattern - Check and see if it is in normal condition. ViewSonic Corporation Confidential - Do Not Copy 25 VP720-1_VP720b-1

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1.5.3
Firmware
Test Pattern: Burn In Mode
(Refer to Chapter III-3. Hot Keys for Function Controls)
- Make sure the F/W is the latest version.
1.5.4
DDC
Test Pattern: EDID program
- Make sure it can pass test program.
1.5.5
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.
1.5.6
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.
1.5.7
White Balance
Test Signal: 1280*1024@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.
- If not, please return the unit to repair area.
1.5.9
Screen Uniformity and Flicker
Test Signal: 1280*1024@60Hz
Test Pattern: Full White Pattern
- Check and see if it is in normal condition.
ViewSonic Corporation
Confidential – Do Not Copy
VP720-1_VP720b-1
25