Macbook A1706 no power

[Lakai]

Hi all!
Got this touchbar 2016 macbook, topcase and battery replaced by apple for the ancient owner, suddenly died.
No corrosion or liquid trace, perfect condition.

-20v negociated
-no PPBUS_G3H

Removed f7000, short on pin2, then I have PPBUS_G3H 13V.
Injected 0.9v 2A on pin2 of F7000, power removed, the only component that gets little warm is U7960.
Removed L7960, current injection on pin2, amperage rising to 2.4A then stabilizes...

Any clues for this one?

[techetronic]

Re: Macbook A1706 no power

mb part number?

[Lakai]

Re: Macbook A1706 no power

820-00239 sir

[Lakai]

Re: Macbook A1706 no power

When L7960 removed:
PPBUS_G3H 13.1 V
PP3V3_G3H 3.3 V
PP3V0_G3H 3.0 V
No cpu rails, 0v6 rail or 1v rail
PP1V8_SUS 0.015v
PP5V_S4 5.14 V
PP3V3_S5 3.35 v
PP3V3_S5_T139 3.3 V

[Lakai]

Re: Macbook A1706 no power

PPVCC_S0_CPU 7 ohm
PPVCCGT_S0_CPU 5 ohms
PPVCCSA_S0_CPU 3 ohms
PPBUS_G3H to PPVCC_S0_CPU=477 ohms
PPVCCIO_S0_CPU to ground=2 ohms

Forgot to mention, board is 820-00239...

[PITERPENY]

Re: Macbook A1706 no power

I have the same problem. But i don't have 1.8 volts

[mon2]

Re: Macbook A1706 no power

If a voltage is missing, remove all power and check the resistance to ground of the missing voltage rail. Next check if the rail is being enabled by checking the voltage to ground of the enable pin.

[PITERPENY]

Re: Macbook A1706 no power

power supply 20v. 0.00A
PPVIN_G3H_P3V3G3H =19.66V
but on L7030 = 0.200V but there should be 13V. Tell me what could be the problem ?