Hi Annie, My name isXXXXX will assist you.I am sorry to hear that you are having this issue,With the set being 28 years old,unfortunately it sounds like the picture tube is near the end . The tube most like has a defective semiconductor, IC or a transistor that has gone, it is not likely worth repair. I wish it was better news.Please let me know if you need any further assistance.Please take a moment to rate my service positively.Thank you very much!
1996 makes it actually 18 years old, not 28! But your explanation is probably the right one.