LG G3 test menu

Was need that after recent drop of the device into the bath room :-)

3845#*855#
OR
*#LGMENU#*855# for marshmallow (*#546368#*855#)

If you stuck in menu: Press power button first and then, still pressing, tap en "normal boot (+power)" (or something like that).

Source: https://www.youtube.com/watch?v=CWWcNQjVlsI