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ViewSonic Corporation
Confidential - Do Not Copy
VA702-1_VA702b-1
32
7. Upload firmware to MCU via VGA Cable
7.1
Connect ISP board between monitor and PC as below configure
7.2
Before plug in the power cord, make sure keep “
▲
“ key to be pressed, when power on you can
enter ISP mode.
7.3
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.
7.4 After finish, please plug out power cable and re-start monitor again.
8
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
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
ISP Board
R
S23
2
9P
IN
D-SUB
15P
IN
D-SUB
15P
IN
PC
VGA
output
LCD Monitor
D-Sub
Insert to
RS232 9pin
CON on PC
Normal
shipping
cable
Service
cable
+12V Adapter
Содержание VA702-1
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Страница 60: ...11 PCB Layout Diagrams Main board Top layout ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 57...
Страница 61: ...Main board bottom Layout ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 58...
Страница 62: ...ViewSonic Corporation Confidential Do Not Copy VA702 1_VA702b 1 59 POWER board...
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