BenQ PD3420Q Disassemble Instructions page 7

3.3 Remove wire and tape by hand.
WEEE ANNEX VII
WEEE ANNEX VII
4. Remove MF and USB SHD from PANEL
4.1 Remove USB SHD. Remove screw and USB BD.
4.2 Remove screw by screwdriver, and remove MF from PNL.
WEEE ANNEX VII