Boeing 777 aircraft display unit

Description

This is a Boeing aircraft display unit. Maybe from B777 ,you can check unit brand information to confirm aircraft type
the screen is broken as you see in photos but circuits board is in good condition inside . I power it up by 28VDC the current shows 3A. 3A is stable .this unit doesn't exit short circuit and over current . But screen doesn’t show anything. Maybe it need signal generating unit to cooperate to work or screen is damaged . If you have any questions,please feel free to ask me