When I mount up my Arduino robot with usb. The LCD display don's show up text. The power led is green. See picture. Any advise? Thanks.
The lack of any code would be a problem.
Assuming it worked before mounting on the robot, double check your wiring. If that does not work post the schematic. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil