Service manual

You should do All Mode Reset (Refer to Chapter 6-3) first. This action will allow you to erase all end-
users settings and restore the factory defaults.
Please select and enter Auto Image Adjust function on Main Menu to see if it is workable. The Auto
Image Adjust function is aimed to offer a better screen quality by built-in ASIC. For optimum screen
quality, the user has to adjust each function manually.
Test Pattern: Burn In Mode (Refer to Chapter 6-3)
- Make sure the F/W is the latest version.
- Make sure the S/N is the same as the Spec. label.
- Make sure the model name is correct.
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.
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.
Test Signal : 1280*1024@60Hz
Test Pattern: Full White and Black Pattern
- Refer to Chapter 6-3
26
ViewSonic Corporation Confidential
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Do Not Copy VP191b/s
5-1-6 Function Test and Alignment Procedure
.
All Modes Reset
. Auto Image Adjust
. Firmware and DDC
.
Fine Tune and Sharpness
.
Boundary
.
White Balance