All our screens are tested before shipment, which is why we guarantee the screen against all technical failures. IF IN DOUBT DO NOT HESITATE TO ASK SOMEONE TO ASSEMBLE IT OR WATCH A VIDEO ON THE INTERNET TELLING YOU HOW TO REPAIR. The dosage is variable from one person to another. It depends on your patience to mount the screen. Plan a time without being disturbed. As with anything you ride, it is likely to have unwanted things although not everyone is subject to it. The product must be returned in its original condition and packaging to be able to be replaced (with the protective films placed on the touch screen). 6 months (EXCEPT: deterioration of the product during assembly: deterioration of the tablecloth, scratched screen, deformation of the frame, etc.) Shipped from France the same.