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For tracing component connections, understanding voltage divider formulas, and identifying resistor/capacitor values.
He noticed a tiny, charred component near the 3V/5V power system circuit. According to the diagram, it was a filtering capacitor on a critical rail for the 10th Gen Intel CPU .
The charger pin sends a signal ( S_IN# or ADAPTER_ID ) to the EC, confirming an authentic Dell power supply is connected.
Do not waste 4 hours searching for lah103p schematic new.pdf . It does not exist publicly.
Always start on page 2 or 3 of the document. The block diagram maps out the bus widths, I2C/SMBus topologies, and shows exactly which components communicate with each other.
Once the B+ rail is stable across the board, the 3.3V and 5V Always-On controller turns on. These voltages are generated even when the laptop is turned off but plugged in.
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Usually utilizes the ISL or BQ series for battery management.
Repair technicians encounter a few recurring faults on this specific laptop motherboard platform: Shorted Ceramic Capacitors on +19V Rail
If any major rail (excluding CPU/GPU) reads below 10 Ohms, you have a hard short circuit.
If you find a short on a rail like +19V or +3VALW , set your DC bench power supply to a safe voltage (e.g., 1V for a 3V rail, or 2V for a 19V rail) and limit the current to 1A. Inject power into that rail and use a thermal camera or isopropyl alcohol to see which component heats up. The component that gets hot is your shorted culprit.
No official LEM datasheet lists a “LAH103P.” However, it is plausible that the user is searching for a (i.e., a circuit diagram) showing how to integrate an LAH‑P sensor into a larger system. The “new” keyword could indicate:
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