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Unfortunately, your set was designed to be repaired by board swapping so troubleshooting tools and methods are limited. The reason the servicer doesn't want to start throwing boards at it is partially economic. He has to purchase the boards upfront and pay a core charge. He cannot return any...

There just isn't any way to know yet. You would also want to doublecheck all the cables and connections on general principles. Even an appliance in another part of the house can produce noise pulses that can show up on screen.

Mild CRT popping is not unusual and often clears up on it's own. It wll either get better or worse. It can be caused by small flakes of the coating inside of the tube dropping onto the internal elements. This will usually clear up. (there are other causes which would eventually require...

Before reconverging, I would remove AC power for about an hour and see if the convergence issue clears up. It's pretty easy to alter data temporarily but much harder to write to memory (extra steps in service menus). As to popping, CRTs do snap and pop at times; usually when the set is months...