820-02098 power cycling


Active member
This arrived with no liquid damage. Power cycles every few seconds. Board looks pristine. Checked all coils and do not see any shorts.

When magsafe or usb-c is plugged in they both turn on for two seconds then off then on. All voltages appear as well.

What should be checked next?


Active member
Same issue is occurring with F5200 removed. C5250 voltage goes to 12.30v then drops to 0V while magsafe or usb-c is plugged in as they go off and come back on


Staff member
Then you may have problems on the charger side; USB-C and Magsafe areas.

I recommend to check diode mode readings around U5200 and compare with good board.
You should check Q5230/40 too.