Macbook A1278 no charge

[dclass-pro]

Hi guys, I have this macbook with 820-2936-b logic board that only turns on on battery.
I tried changing the charging connector the SMC controller and the cairca ic but it still doesn't work. When I plug in the magsafe I have no light, as soon as I plug it in with no battery the mac won't turn on (usually all turn on).
I did the various checks and only with the charger connected to the U700 pin I have:
pin2 - 16V
pin3 - 3.8V
pin19- 5V
pin14 - 3.3v

PPBUSG3H have 3.4V
absorption with bench power supply 0.07A
do you have any idea?

[Adogabriel100]

Re: Macbook A1278 no charge

PP3V42_G3H voltaje?
voltaje on pin 14 of U7000?
voltaje of SMC_RESET_L?

[dclass-pro]

Re: Macbook A1278 no charge

PP3V42_G3H voltaje - 3.4V
voltaje on pin 14 of U7000 sometimes it's 0v and sometimes it's 3.3v
SMC_RESET_L 3,4V
How can I check if the DCIN connector is working?

[Adogabriel100]

Re: Macbook A1278 no charge

Voltaje of pin 10, 11 and 13? of U7000

[dclass-pro]

Re: Macbook A1278 no charge

all 3.4V

[mon2]

Re: Macbook A1278 no charge

PPBUSG3H have 3.4V

This is not correct. Measure again the voltage of PPBUS_G3H to ground @ F7040 (check both sides of this fuse).

Use only the official netnames (labels) used in the schematics. It will make it easier for others to review to debug your case.

[dclass-pro]

Re: Macbook A1278 no charge

I confirm that on both sides of F7040 I have 12.94V