Fault at its main digital board.
Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Search the site by type in the "
brand name" to your device; [Exclude the model number], in the "
Search box at the top right of the display window of the Homepage" to get gathered related posts.