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ViewSonic Corporation
Confidential - Do Not Copy
28
Upload firmware to MCU via VGA Cable
1.
Connect ISP board between monitor and PC as below configure
2.
Before plug in the power cord, make sure keep “ ” key to be pressed, when power on you
can enter ISP mode.
3.
8051ispwriter.exe will detect automatically which MCU used in this monitor. Do it as the
order shown on the screen, choose the corresponding firmware version, and load to MCU.
4.
After finish, please plug out power cable and re-start monitor again.
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 5~6 shades
brightness cannot be distinguished.
Chroma
Signal Generator
Color
Temperature
1. Do “Auto color” at 1280 x 1024@60Hz, 32gray shades
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
ISP Board
RS232
D
-SUB
D
-SUB
PC
VGA
output
LCD Monitor
D-Sub
Insert to
RS232 9pin
Normal
shipping
cable
Service
cable
+12V Adapter
VA702-2_VA721-3_VA721b-3
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Содержание VA702-2
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