A1707 not powering up.

[tahirr]

Hi, learning board repair here.

A1707 producing 19.9V, 1.01 Amps and 21 watts on all four ports (with a tiny fluctuation between ports).

No shorts at these rails with diode mode readings at these test points:

PP3V3_G3H: 0.347
PPDCIN_G3H: 0.540
PPBUS_G3H: 0.420

When charge port is plugged in all these will get very hot:

UB000
U2800
U7210
U1100

Inspected the full board for damaged parts and tested almost all caps and resistors for shorts. No issue found.

Thanks in Advance.

 

[2informaticos]

First of all, welcome to the forum!

What is exact PPBUS_G3H voltage?

Be aware, this board doesn't start with 45/61W charger, if battery is empty.
Use 87W charger, to avoid any surprise.