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There should be three circuit boards on that model a small board on the right then a larger board in the middle and another large board on the left the vertical IC will be located on the middle board it will be attached to a aluminum heat sink.
try resoldering the vertical output IC. sounds like the cRTs are blanking due to the vertical. If that doesnt help you may need a new IC. While youre there look for signs of the CRt leaking as often it leaks right onto the vertical output section real close to the IC.
try resoldering the vertical output IC thats most likely the problem if not the vertical output IC may need replacing. If you can solder you may be able to do this yourself as its not a hard repair the replace the output IC
no sounds like either the vertical output IC needs resoldering or maybe defective. vertical IC will make the tubes shutdown for safety while audio and Crt heaters will remain on. Try resoldering the IC if that doesnt help replace the vertical output IC its an inexpensive part. If you need more assistance please let me know
That sounds like vertical failure. Does the blue line run across the screen from side to side? Try resoldering the vertical output IC and see if that straightens it out. This is sometimes been a problem with that chassis. Let me know how you make out or if you need additional help.
That TV uses the PTK195 chassis, and the fact that you see only a thin line for each color near the bottom of the screen tells me your vertical output IC has stopped working, and is putting a small DC voltage across the yokes. I have seen this caused by a defective vertical output IC and I have also seen vertical problems caused by a small CRT coolant leak which drips onto the main board near the vertical output IC. If you do not have experience servicing the PTK195 chassis than have a qualified tech handle it for you.