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Your issue will be likely be the defrost board. It controls the fan in winter...but it is responsible for ac in summer but no defrost. There is a test if you would like to do a hands on project..
If you wish to proceed with the test just let me know..it involves moving one wire
Coming from the motor (if still color coded) is a purple wire that goes to a circuit board on a terminal DF2...do you see this terminal?
on this unit there are few things that can cause this.
Capacitor - which you changed
Motor - which you changed
Defrost board - which is what I want to test.
Since you are tech savvy I assume you have a set of jumpers?
At the bottom of board.
A purple comes from fan motor. DF2
A red comes from dual capacitor terminal C - DF1
We want to put a jumper on DF1 to Df2..then try unit.
Measure voltage as such -
one meter lead to DF2....other meter lead to contactor where black wire from motor attaches attaches.
also let me know if new motor wired te same or was a retrofit
And Brown is on Fan on dual capacitor?
The brown wire goes to F (fan) on the dual capacitor
Hope that is all it is. If it fires up and all is well just rate service and I will move off active list.
If you need more info just let me know.
I would cut and crimp fresh fitting on brown wire and replace the capacitor (again).
There is a chance the cap or start windings have been compromised due to previous failed starts.
AND make sure the cap matches motor microfarad value.