I want to repair my old Ebike without giving hundreds of euro for a specialist

Hey guys, i found an old Gazelle Ebike and everything is okay with the Bike and it functions, besides the display, i cant activate it and i dont rlly know the problem

here a picture of the modell from the display

• the problems i think it could be:
• maybe the cable broke
• the pins on the display are oxidated
• the display is just broken