Service manual

ViewSonic Corporation Confidential - Do Not Copy

(4). When the picture show “Verify OK”, ISP finished.

5.7.3 After repair, to ensure the quality you should do the following test and

adjustment

Item Content Equipment

Test OSD function

1.Signal is set as 1280x1024@60Hz

2. LCM button are from left to right, checking whether each single

function key and compound function key can be worked.

Chroma

Signal Generator

Contrast Check

1. Set input mode to 1280x1024@60Hz

2. Set Pattern to 32 gray shades

3. Set contrast to the max. The brightest 6~8 shades brightness cannot

be distinguished.

Chroma

Signal Generator

Color Temperature

1. Do “Auto color” at 640 x 480@60Hz, 5-Mosic pattern

2. Measure color temperature, check it complies with the following

temperature:

5400K x=0.335 +/- 0.02, y=0.350 +/- 0.02

6500K x=0.313 +/- 0.02, y=0.329 +/- 0.02

9300K x=0.283 +/- 0.02, y=0.298 +/- 0.02

Chroma Signal

Generator and color

analyzer

Modes switching

check

1. Use Chroma Pattern Generator to make sequence.

VESA (640x480 800x600 1024x768 1280x1024), MAC 832x624

DOS (640x350 720x400), the detail supported modes and power

saving signal.

2. Confirm the above timing modes must be full screen and the

picture must be normal.

3. LED is Orange at power saving mode.

Chroma Signal

Generator

VX1935wm-3