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check around the CRT socket for the icky green corrosion around the focus pin. That can sometimes kill the focus voltage. This set is probably too new for a focus rectifier tube, so it will use a focus rectifier diode (long skinny white tube.) its a rarity for these to fail all together. There are resistors that make up a voltage divider for the focus voltage to the CRT inside the HV cage. They are usually around anywhere from 2.2 to 10meg. They will drift with use and age.
And of course, the regular applies here too. Check high voltage supply, regulator, rectifier, etc.
Let us know what you find.
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Jordan
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