820-01041 fan spins high for a second and then turns off

[arash]

Im currently working on an 820-01041 wich boost to 20v and draw approx. 1.7A. Fans spin up normal for around 10 seconds. then the fans do a burst and the Macbook restarts.
It had minior liquid damage near j5100, u5104, . I have already tried:

- Disconnecting everything except battery. (since it doesn't boot without it) and one usb-c port adapter.

My guess is, that it is a temp. sensor. (maybe the one in the battery ?)

What do you guys think?

 

[2informaticos]

Do you get correct PPBUS_G3H without battery connected?

 

[arash]

12.60V. i believe its correct.

 

[arash]

without battery trackpad clicks, but fans don't spin. Is that how its supposed to be?

 

[2informaticos]

Fan will start later I supposed.
Did you check for USB activity?

 

[arash]

no usb activity.

 

[2informaticos]

Try DFU restore.
Search the forum, several threads available.
May not be easy to get it at first attempt.
Read what other members commented...

 

[arash]

i have found the problem: it was the battery cable. One Trace had no connection. After replacing it, it works just fine. Still thanks