how can i fix onn television?

The problem you are describing appears to be a vertical circuit problem. You could have bad solder connections on the vertical output IC. You can inspect the PC board around the vertical IC to find out if that is where the issue lies. Call a technician to fix it for you if you can't do it yourself.
If you need a tech service here you are a tech website www.tvrepairjacksonvillefl.com . Good Luck

abel
August 2012