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Do you have image for sure?
If yes, post BKLT_EN and BKLT_PWM voltage.
If not, check for USB activity.
Does it chime at least?
Post voltage on both pins of D7701.
100% got image boot all the way to os. Chimes!
D7701 no power on both ends i checked both traces from u7701 i also change u7701 just in case.
no voltage on d7701 and bklt_en & bklt_pwm
i forgot to mention this was also some waterdamage
3 area affected with visible corrosion:
u5110
u7090
q7560