Chosen Solution
So a few days back, my MacBook shut down randomly and wouldn’t turn on. I took it to an Apple store and they said its a logic board issue. I then took it to a 3rd party for the logic board repair. Now my MacBook boots up fine, but it runs only on AC power. I’ve tried SMC reset, but no progress. The battery is detected and I’m pretty sure that my battery hasn’t been swapped during the repair judging by the cycle counts before and after the repair. MagSafe shows the green LED and the battery is indeed charged to its full capacity. However, when I disconnect the wall adapter, it switches off. When starting it again, the date and time gets reset.
The menubar shows 100% and reads: Battery is charged Power Source : Power Adapter Also, yesterday it showed 100% with green light even though the current charge was somewhere around 5600 mAh and was charging with low wattage (~0.5 W). Just in case, the issue with the logic board was probably due to a power surge and a particular component that protects the processor from power fluctuations, I’m not sure which one, got damaged.
Alpha72 - Sounds like they failed to fix the charging logic within your logic board. There is a MOSFET unit that often burns out from power surges Q7100 (POWERPAK-6X3.7)
I would bring it back so they can fix this Update (07/27/2019) OK here’s the schematic for that board layout Here its a different supplier for the same component Q7180 IRF9395TRPBF DIRECTFET-MC
As you can see its the same design! The labels are a bit different as well.
