TV - Thin horizontal line picture on screen

Hi there,
We have just taken a TV out after having been boxed up for several months - the TV, not us. The sound is fine but the picture has reduced to a thin horizontal line approx 1 cm deep. The screen is black below this line. Above the line are thin horizontal "strands" spaced about 1-2 cm apart. To complicate matters, someone has lost the remote!
Diagnosis and options welcomed
Thank you,
Ian