Hello, sorry for my bad language (i´m from Italy) but i had the same issue with my device, and i found out, that there is a small spring connecting the lid to a lever inside. Witch pushes the printhead to the tape when you close the lid.
So, if the hole in the lever, where the spring is hooked into, is damaged it can´t work anymore. I fixed this issue by carefully carving out a small piece of the plastic casing to get access to the lever and the spring. Then i was able to reattach both together with a pinzette. If the hole is too damaged for reattachment i suggest it would also be okay to drill a small new whole into the plastic lever, as close as possible to where the original one was.
I also made a picture and uploaded it here:
https://s19.directupload.net/images/200129/vq4qowpp.jpg
I have no cloud account, so i don´t know a better place to upload it; If someone does and finds this picture useful, please reupload it there!