Vertical scan output section circuit fault. The vertical scan out IC fault is a common problem. Check and replace it. Contact any service technician. If you wish to get some details; check the sites linked here. Pull up older posts.
Circuit diagrams of many popular brand TVs and other devices are given.
http://electronicshelponline.blogspot.com/
http://schematicscom.blogspot.com/
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts
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