Sony TV - Loss of half the picture. Sony FD Trinitron; KV-27FV310 (over 2 yrs old)TV was working

Question

Sony FD Trinitron; KV-27FV310 (over 2 yrs old)TV was working fine, then all of a sudden....Bam! I could only see half the picture. Horizontal line half way down cutting out/off top of what actually should be seen on the screen. Bottom portion viewing is good. Top potion is black. Never had issues with TV for past two years. Connect to cable.