A1707 not powering up.

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.

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.

2informaticos said:

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.

Click to expand...

Thanks for quick reply and welcoming me.

Getting an 87W charger today, that could be it.

Here are the voltage readings:

PP3V3_G3H: 3.41
PPDCIN_G3H: 19.86
PPBUS_G3H: 12.62

That's good.
Post which big coils get voltage?

BTW, write directly into bottom reply box, instead of clicking Reply button.

Which big coil? There are so many with different sizes. All of them? It will be hard to post them here in order.

More difficult than this?
Resistencias con masa:
Ohm Diodo
L2950 1K 271
L2990 3K07 367
L4202 345 228
L4203 1K29 400
L4204 1K08 332
L7211/21/31 4.9
L7330 28.5
L7410/20 8.7
LA640/50 1.9
LA350 23
LA300 66 ---
LB150 955 271
LB190 2K68 335
LB700 932 190
L7030 6K87 370
L7600 110 438
L7660 80 383
L7960 80 134
L7900 193 127
L8000 110 260
L8410 2M8 892
L3500 1K38 245

I only asked for voltage in fact.
Above readings help you as refference; if no voltage detected.
BTW, I got them from 820-00281 board.