ALF1
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ALF1's post in TO/GA works when it shouldn't was marked as the answerI am not a 737 pro BUT, I will tell you what I know.
A/T is an independent system from the A/P, but designed to work in conjunction with.
If you have takeoff thrust specified in the FMC, and you press TOGA, you will have throttles advancing power and TOGA annunciated by the N1 gauges. This can occur without either FD engaged as long as the A/T is armed.
This must not be confused with the TOGA FMA PITCH annunciation, which needs the FD on for the command bars commanding TOGA for pitch.