[beery]

Hi Remataz,
Welcome to the world of vintage telly repairs.

You have a good set to start on there.

The first thing to do is to replace (or at least for now cut one end off) the two mains input filter capacitors, C37 and C38 (on trader sheet 1379), one before and one after the mains switch. These need to be class X types.

As you are new to TV repair, then I might sugest replacing one capacitor at a time and powering the set in between to see what effect each new component has.
A circuit is essential if you want to understand what all the parts do.

Good points about your set. The line output transformer (LOPT) seems to be OK and the CRT seems to be good.
A dim raster at the moment can be due to a low A1 (G2) voltage on the CRT which is probably down to a leaky boost capacitor in the line output stage. Also we have found that CRTs that have not been used for decades can be a bit dim at first but gradually wake up as you start to use them again.
I note as well that your set has an early solid state HT rectifier and these don't seem to last too well.

Feel free to ask for advise here.

Cheers
Andy Beer