ViewSonic VA902B Service Manual - Page 25

EDID Rewrite EDID data to EEPROM, Upload firmware to MCU via VGA Cable

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6. EDID (Rewrite EDID data to EEPROM) If we need to rewrite the EEPROM data, please confirm the following steps. 1. Plug in VGA Cable; we can rewrite the EDID data to EEPROM by using "EDID Rewrite" program. 2. If the "EDID Rewrite" process finished, please pull out VGA cable and press ''2''+''▲'' at the same time. 3. Pull out AC power cable or press power key to restart. 7. Upload firmware to MCU via VGA Cable 7.1 Connect ISP board between monitor and PC as below configure Insert to RS232 9pin CON on PC D-SUB D-SUB 15PIN 15PIN RS232 9PIN ISP Board Service cable LCD Monitor D-Sub PC VGA output +12V Adapter Normal shipping cable 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. ViewSonic Corporation Confidential - Do Not Copy VA902/b 22

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6. EDID (Rewrite EDID data to EEPROM)
If we need to rewrite the EEPROM data, please confirm the following steps.
1. Plug in VGA Cable; we can rewrite the EDID data to EEPROM by using “EDID Rewrite” program.
2. If the “EDID Rewrite” process finished, please pull out VGA cable and press ‘’2’’+’’
▲
’’ at the same time.
3. Pull out AC power cable or press power key to restart.
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.
ISP Board
RS232
9PIN
D-SUB
15PIN
D-SUB
15PIN
PC
VGA
output
LCD Monitor
D-Sub
Insert to
RS232 9pin
CON on PC
Normal
shipping
cable
Service
cable
+12V Adapter
22
ViewSonic Corporation
Co
nfidential - Do Not Copy
VA902/b