Sony tv problem. I have a sony 27 inch tv that is 12 years old. When we got back from vacation I

Question

I have a sony 27 inch tv that is 12 years old. When we got back from vacation I noticed horizontal lines in the picture. If I lean it forward or bang on it the picture returns to normal. After awhile though the lines return and I have to bang on the tv or lean forward to correct the picture. I did have a few instances where I turned the tv on with no picture present. If i move the tv a little bit, after awhile the picture comes back. I am about to get a new tv, but will get it fixed if it is a small problem. Thanks.