MagSafe 3 and Thunderbolt 4 charging faults
The M2 generation charges through MagSafe 3 or any of its three Thunderbolt 4 ports. Charging faults present as no MagSafe LED activity, an intermittent connection, a 'plugged in, not charging' state, or a machine that discharges while connected during heavy work. The fault may sit in the connector, the port, the charging circuit, or the board. Testing a known-good cable and adapter across all four charging paths narrows the problem substantially before the machine is opened.
