Ldb-2 Mb 11232-1 Schematic |top| -

She cross-referenced the schematic. PC403 was listed as "CAP, CER, 10µF, 6.3V, X5R, 0402." Its function was to decouple noise on the 5V_ALW line—the very line that woke up the embedded controller (EC) and told it to start the power sequence.

The board's silkscreen read: .

"Where is the short?" she murmured. According to the schematic, the main power rail (VIN) spread like capillaries to three major components: the charging IC (PU301), the main voltage regulator for the 3V/5V standby rails (PU401), and—infamously—a cluster of ceramic capacitors (PC401, PC402, PC403) near the standby regulator. ldb-2 mb 11232-1 schematic

The ammeter jumped: 0.000A → 0.015A (standby) → 0.850A (power on). The fan spun. The screen glowed. She cross-referenced the schematic

Mira began the diagnostic ritual. She plugged in the 20V adapter. The ammeter on her bench power supply twitched to 0.000A. Nothing. Dead short. "Where is the short