Philips TV crt widescreen colours go red the turns itself off?

Hi,
My tv is pretty old 2000 / 2001 something like that. Yesterday it started turning itself off. All the colours go a deep red just before this happens. If I leave it off for a while, when turned on it'll last maybe 20mins, but once it turns itself off it struggles to come back on unless I leave it again.

Its a Philips Widescreen crt
Model no. 24PW6006/05
Chassis (i think) SL01.1E AA

I cant afford a new tv so fixing it is a must....
cheers
Russ