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Your TV has vertical fold problem. Just check all the electrolytic capacitors. On checking, most of them may look good. But on circuit, when energised, will show problems. So it is best to replace all of them once and check. Please check the electrolytic capacitor connected to the vertical power supply [usually comes from the secondary supply section of the Line Output Transformer], first, and replce it. It may be a 1500Mfd or 2200mfd. Check it first by replacing a new one. In most foldover cases, this service will solve the problem. firstname.lastname@example.org
You have a vertical foldover. Check the caps near the two vertical ICs. HMMM it does not surprise me...There could be a couple of suface mout caps. to check...I do not remember the locations at this time. But try the electrolytics...they are easy to check.
There is a problem with the vertical circuit. Eventually th foldover will get worse. If you are comfortable working inside the set, with a little investigation, you should be able to resolve this yourself. If you would like to attempt the repair, update this and I'll provide additional details and instructions. Realize that this will take a few interactions to locate the defective part.
There are some components it the vertical deflection amplifier area that are becoming thermo sensitive with age. It is also possible that there will be parts going off value in the power supply and other areas.
These problems are typical in these sets when they are aged. The cost of the repair may not be worth the investment.
You should take the set in to a service center for an estimate.
More than likely it's not the crt. If the picture has "foldover" at the top of where the picture is currently, then more than likely there are bad caps. in the vertical scan circuit. If not, the vertical sizing probably just needs to be adjusted. You will have to get in to the service menu to do that.
If you have a picture but the top is folded over, your vertical IC is probably good and you need to replace the pump-up capacitor next to the IC. When the pump-up cap (typically a 47 or 100uF 35V cap) is open then the picture will have white lines and foldover at the top. The typical vertical output IC is the LA7838, but I am not familiar with exactly which output IC your set uses.