Acer VG270U Lifecycle Extension Manual page 34

5.8 After writing the EDID pass, you must read the EDID to ensure the EDID data had been write into the monitor.
Choose one of the port to read.
1. If it appears all "00" when read the EDID data,you need reconnect the ISP tool or install the the driver of the ISP tool
again.
Note: While reading the DP EDID data, you must light up the monitor or connect a signal to the monitor. If after doing
this setp the EDID still shows all "00", but others port can show the EDID data, the EDID data of DP uaually
include in FW,can't read out it.
2. If it appears all "FF", it shows that the EDID data of the Main board is empty, you must writing the EDID again.
6. Troubleshooting.
6.1. Can't write!
(1) AC on the monitor and turn on it.(Restart the monitor)
(2)Take apart the monitor and connect the 7pin of EEPROM to GND to diable write protection then write EDID one
by one.
(3) Set the Burn in on last to try again.
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