BenQ BL2423PT - Accessing BenQ Factory Menu; BenQ Factory Menu Operation

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5.3. The way to open BenQ factory menu
(1)Connect signal source and power cable to monitor and DC off it.
(2) Press “source” key, “return” key and “power on” key synchronously as below figure. When the screen lights,
release the three buttons and then press “return” key to open below factory menu.
Factory mode
source key
return key
Power key
return key