Acer H236HL Acer H236HL Monitor Service Guide - Page 51
Check the S/N.
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49 7.4 Check the S/N. S1. Press "MENU" key -" "- "Information"-"SN" in user mode. 7.5 Q&A S1. If can't write! You could try to restart the monitor (AC on the monitor and turn on it). S2. If can't write! Take apart the monitor and connect the 7pin of EEPROM to GND to diable write protection then write EDID one by one. S3. If can't write! Set the Burn in on last to try again.