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Check and replace all electrolytic capacitors in the vertical output section circuit. There will be 5 or 6 of them to replace. Replace all at one time. The fault you describes here is technically known as 'vertical retrace lines'. Visit the site named 'Electro-help' for
more details. Click this link. View it in
'Flip card' option, which can be selected from the drop down box
menu by the [Sidebar] tag, at the top left corner of the display
window. It will make search easy. There
are more than 990 posts to different brand TVs now. Sometimes, you might get some more details from there.
Lines means Screen Drive is overdriving, try adjusting the Screen control on the FBT flyback Transfomer, adjust it down. If that does not Clear out Problem then replace the CRT Board that is connected to Picture Tube.
if it is white brightlines along with blue back ground please check
1 sypply to blue video output transformer.
2 crt base or connector loose.
3 check components related to blue video ckt & blue video output transistor.
4 blue signal reaching to blue video section
5 verv very rare case if set is old set then there is a possibility of crt.
hope this will help.
Is good that you hit it and it reacts,very likely you have loose conections in different places but for the distorted picture you need to check the horizontal driver transformer and flyback after that is corrected you need to check the complete chassis for loose conections.Take your time.Good luck.