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Failure of vertical scan output circuit. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
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vertical output ic needs to be resoldered. careful leaving that bright line displayed on the screen as this will cause a permanent phosphor burn into the tube. this can not be corrected once burned unless you replace the tube. mch
a bright thin line in centre is called horizontal line.
first of all do not keep tv on unless it is rectified.
If you want to put on tv keep brightness minimum to protect your screen for any demage.
your problem is in vertical section.
1 check vertical supply.
2 check parts in vertical section or loose contact.
3 yoke connrctor loose
4 ic defective
It is not serious problem can be rectified easily
A line running across the screen like that and then returning to a picture I would guess is the vertical IC has some poor solder joints. The vertical IC in that unit IC401 is an LA78041 a seven pin IC that is mounted to a metal heat sink. On the foil or under side of the board take a careful look at the pins of that IC and any that look suspicious carefully re-flow some solder over.. Careful not to keep your iron on the pin too long.. And if have to re-solder several take some time between them to allow the IC to cool so you don't damage it..