Not necessarily, capkits can do alot of good, but its tough to say that a capkit will solve this
Better is to measure all the caps on the chassis and see if there are bad caps.
anyway, Great you got something on the screen now, that saves me a trip to my mother to pickup my monitor
if you check the manual, you will see that pot 17 and 18 are for height and width..
try to turn those..

in fact, just turn every pot you see to check if there is any improvement.
just remember +- how the pot was in case it does "nothing"
Also maybe Andre can test your tubes with his Muter rejuvinator to see / check the condition of your tubes..