Pixhawk 1 won't takeoff in loiter

hi every body i got some problem with my drone i just build
prop are 12 in
motor 620kv
batt 16.8 i use the swellsplash batt 4s
body fram of drone splash3
ecs 45A
fc pixhawk 1

i try on flight in loiter mode and drone stack with nose up and not can go up
what is the problem somebody can help me >?
maybe my pcb was not give strong current ??

i can add bin file

thanx to all will help me cus i donot know how check log2021-03-07 22-27-12.bin (430.7 KB)