May not be CRT. You can tap the neck & see if it comes & goes
but you also shake the CRT board.
Most sets the filament comes off the FBT & one side goes to ground.
You have to lift it above ground & if its grounded in the FBT
out of luck. Also when you get a H-K short USUALLY the K goes
to 0 V & lights up bright the bad color then set goes into
shut down.
Another test is lift the blue K & one of the others. run jumpers to
swap the K's & see if the blue still acts up or it goes over to
the other color. Do it with a B&W pix to save confusion !!
Sears had a crap load of 19" Sanyos with Sylvania jugs shorting.
Cure was get the filament above ground & add a 1.5 meg & .001
cap but I dont remember where ! IIRC the resistor went from the bad K
to filament but dont remember where the cap went
BTW someone used to make an isolation booster that worked on
the sweep freq. You would wire it for no boost.
Maybe Brian remembers ?
73 Zeno
LFOD !