Sony Xperia Z Ultra C6802 Defective Screen, DOA

Model: Xperia Z Ultra C6802 (White) Region: Hong Kong, unbranded, unlocked Firmware: Bought a Sony Xperia Z Ultra from Expansys Japan. Arrived DOA, screen is defective. Pressing power button turns on the backlight, but the screen stays blank. Even when restarting or resetting the device, the normal Sony Xperia boot screen animation does not show. Updating to firmware and performing factory reset does not resolve the problem. For discussion,