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Hi and welcome to VideoKarma. Those magnets on the yoke were probably for centering and you should keep them installed.
Yes, the position of the ion trap magnets on the CRT neck are crucial to seeing a picture. Just a slight misadjustment will cause it to go dark.
The new 21YP4 uses electrostatic focus so you should remove the electromagnetic focus ring for the neck if you have it installed. Pin 6 (G4 focus voltage) should be connected to something in the -64 to +350 volt range. Often it's just shorted to either G1 or G2.
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