a1708 820-00840 missing PPBUS_G3H

[nassih]

hello! I want to open a new topic about MacBook Pro a1708 820-00840 no power giving me some issues.missing PPBUS_G3H
state before replacing some components:c7078,c7062 was shorted,u6990,d6905
all this line are not present: USB meter show 5.2v 0amp
PPVIN_G3H_P3V3G3H : 0.23
PM_EN_P3V3_G3H_R : 0.12v
PP3V3_G3H : 0.2
PPBUS_G3H : 0.02
NOW i have : USB meter show 20.1v 0.08amp
PPVIN_G3H_P3V3G3H : 19.75v
PM_EN_P3V3_G3H_R : 5v
PP3V3_G3H : 3.4v
PPBUS_G3H : 0.132v

[mon2]

Re: a1708 820-00840 missing PPBUS_G3H

Remove all power. Meter in resistance mode.

Check the resistance to ground of PPBUS_G3H. Post the measurement.

You are checking for a low resistance which will cause this rail to shut off due to an excessive load.

[nassih]

Re: a1708 820-00840 missing PPBUS_G3H

resistance to ground of PPBUS_G3H is about 0.7m coming down

[nassih]

Re: a1708 820-00840 missing PPBUS_G3H

it's like we measure a capacity

[nassih]

Re: a1708 820-00840 missing PPBUS_G3H

R6905 removed i have 8.56v on D6905 side

[nassih]

Re: a1708 820-00840 missing PPBUS_G3H

what do you think mr mon2 you have an idea?