Display suddenly weak

[NI0X]

Hi there, I was just testing around a bit, USB connected, disconnected it and there it goes, the Display is very weak now!
With contrast at 45, without backlight it is impossible to read, with backlight it's very dfficult.
What happened?
Wrting the Firmware doesn't change anything

[dinamich]

Coincidence, open the case and check and reinsert lcd cable/connector. While you are there also check all other connectors.