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I checked it and disconnected touchbar, camara, touch id and same result.
The problem now is that i dont get even image on touchbar. I cheked J4401 and seems ok. Than i saw that L4401 was moved (probably by me when was working on Q4400. Repaired it and get about 0.4V on both sides.
I am trying all that with board out and with externel display.
You mean webcam from lcd assembly board?
Anyway before repair when i start mac with board out it was taking much less time to arrive login display. Now it can easily take about 3-5 minutes.
Pin1 - 1.76V
Pin 2 - 0.37V
Pin 15 - 0V
Pin 18 - 0.17V (R4481 is ok and there is 1.8V on other side)
Pin 20/21 - 1.8
Pin 22 - 5.1V
changed q4400 and now get 5V on Pin 2 and 1.8 on pin 18. BUT there is problem. I think T2 is "protecting" mac and now mac is asking for critical update to continue...
The board was "checked" by other technician and there was overheat on touchbar's touch flex componentes (under metallic protection.) and touchbar wasnt working at all. I bought touchbars and now touchbar gives image but touch is not working. Checked J442 and seems to be ok.
Checked J4402 for...
Got this board with just 1 resistor bad R6125 (seems it was water damage just on 1 pin).
CHecked all resistors near U6100 and they are ok. When plug magsafe fan spins for 5 seconds than turns off and than spins again for ever.
CPU is getting warm, all rails are ok, i have vcore 1.8V, ALL SYS...
changed L7720 again and now it is working. i dont know exactly if it was just l7220 because i also changed U7701 again. Anyway i am sure that l7220 had continuity and there was 5V on both pins. Even if it was so may coil fail?