ViewSonic VA902-3, Service Manual

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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
A. TIMING: 1280x1024 64KHz/60Hz.
B. PATTERN: 5 Blocks.
C. LCD MONITOR set to 1280x1024 80K/75Hz BURN IN and warm up over 30
minutes.
D. CA110 color analizer at the center of screen and along a perpendicular to the
screen at 20cm from the display.
E. Power turn off, Press
“ ▲ ” and “ ”
and turn on power at the same time after
power LED is on, release
“ ▲ ” and “ ”
key, Then press “ ” key go to
factory mode. (Fig.1)
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(Fig.1)
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VA902-3_VA902b-3
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