Chosen Solution
Coconut status just before attaching charging cable:
When charger first plugged in after partial battery discharge:
About 2 minutes after plugging in power cord:
Computer randomly goes into hibernate whenever on battery or AC power. Replaced battery with one from iFixit, recalibration steps multiple timesReplaced MagSafe board with one from iFixitReset SMC dozens of times, with battery connected and with it disconnectedRan caffeinate, no change in behavior.Etrecheck shows no errors, CoconutBattery shows normal battery performancePower Saver parameters all set to “never". removed Power Saver plist settings to let it recreate fresh, then set to “never” — no changeRemoved unneeded Thunderbolt ethernet from configMessage in power management console log saying “Low Power mode sleep” is the only thing is the macOS seems to record at the time it hibernates.Light on MagSafe power cord (tried more than one) turns from Green to off to Orange to off randomly even though battery icon (top right) still shows ‘charging’ I’m at a loss at what to try next. Please help. Thanks.
Sorry ;-{ mmm…. So its clear we don’t have a power issue here at the battery or charger. I had hoped it was something at this level as that only leaves a deeper logic board issue with the CPU’s VRM’s and/or SMC logic and its sensors. I would run the onboard diagnostics to see if anything pops up there. Restart your system and press the D key to enter. I would also install TG Pro as well as see if it see’s any issue with the sensors. Beyond that you’ll need to inspect the logic board (both sides) for corrosion damage or damaged components. If you don’t seen anything you will need to find someone who has the deeper skills to fix your logic board or you could just replace it. Reference: Mac startup key combinations
