I'm a electronic tech but have practically zero experience on TV's
(apart from I know they suffer from dry joints and have high voltages
inside!), so would anybody like to diagnose the following fault for
me:

Picture has shrunk (vertically) and gone into like a letterbox format.
TV is a toshiba (UK) Model No. 2505DB

Pictures of the fault can be viewed at:

http://www.beanpix.com/IMG/701016038225691.jpg
http://www.beanpix.com/IMG/701016039232641.jpg

Any hints or tips would be appreciated.

Cheers
Dave.