美国采购需求：3D打印机，405nm，光敏树脂，光敏树脂，树脂3D打印机，Tronhoo 3D打印机

I've recently learned that a friend received a device as a Christmas gift, but unfortunately, the touchscreen isn't functioning properly. This has caused some frustration since he was really looking forward to using it. Could you please provide guidance on how to troubleshoot this issue? Additionally, if there's no easy fix, I'd like to know if he can send the device in for repairs or exchange. Any details on the return process or repair options would be greatly appreciated. Thank you!