Measure from +PWRSRC (at the main current sensor) to ground. A reading close to 0 Ohms indicates a shorted component.
Pins 8-13 are internally connected to the magnetic shield around the Hall core. The reveals that leaving these floating invites noise. The correct method (per the new diagram) is to connect these pins to chassis ground via a 1MΩ resistor + 10nF capacitor in parallel. This drains static charge without creating ground loops.
Essential for mapping component locations (R-resistors, C-capacitors, Q-MOSFETs, U-ICs) to their electrical function.
You have the new schematic in hand. Now, let us build a practical circuit. lah103p schematic new
The laptop powers on, all auxiliary rails (+3.3V, +5V, +1.2V) are present, but the CPU remains cold, and no core voltage is produced.
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.
Features an onboard, soldered Intel Core processor (typically 10th or 11th Generation Intel Core i3/i5/i7 Ice Lake or Tiger Lake U-series). Measure from +PWRSRC (at the main current sensor) to ground
However, I can still provide for finding or working with this schematic.
To help pinpoint your issue with this motherboard, could you tell me:
: High-level overview showing the connection between the CPU, system memory (DRAM), and major input/output (I/O) interfaces. The reveals that leaving these floating invites noise
For troubleshooting a "Dead" or "No Power" board, follow this voltage measurement sequence: 1. Primary Input (VIN) +19V (B+): The main power rail distributed after the DC-in MOSFETs. Check Point: Measure the current sense resistor (usually labeled or similar). 2. Standby Voltages (Always-On)
Below is the industry-standard schematic for connecting the LAH103P.