Service manual

ViewSonic Corporation Confidential - Do Not Copy VA503b-2_VA503m-2

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

ISP Board

Print Port

25PIN

D-SUB

15PIN

LCD Monitor

D-Sub

Insert to Print

Port 25pin

CON on PC

Service

cable

7.2 Using mStar ISP Tool Update FW:

(1). Seletct “Read”, Choose the corresponding firmware, load to MCU.