Located right at the main voltage input rail, the primary dual-MOSFET arrangement blocks reverse currents and manages short-circuit protection. If the laptop fails to charge or switch to AC power, verifying the gate drive voltage from the charging IC to these input transistors is the first logical step. 2. Embedded Controller (EC) and BIOS SPI Corruptions

Review the layout file to identify which branch circuits attach directly to the shorted plane.

The schematic clearly indicates how the block clips onto the front or top of the main contactor. Identification Markers: Labels (such as