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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, have you checked / monitored the voltages of the different pins of these ICs? ...before and after shutdown?
7-blinks is "Horizontal Deflection Stopped"
Still, have you checked if the +200V is still present? ...how about the other output voltages of T6502?
This would be using the DA-4 chassis. Please click HERE for the D-Board schematics. Equally important would be the table on the right side of the page for the expected voltage readings.