Factory Mode - BenQ BL2423PT Product Service Manual – Level Ii

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.
source key

Factory mode

return key
return key
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Power key