A coworker is having a problem with his 2 year old Panny 24 inch TV/VCR combo. Basically, he has sound but no picture. When playing a tape in the VCR, same problem. All I can think of is that the picture tube died but since the TV is not the old I wonder what else could cause this. I have become his source for A/V info and this one has me stumped, any ideas?