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Based on the design architecture of the X1 Carbon Gen 7 (LA-G121P):
: Intel Celeron N4000 (SR3S1) or similar Gemini Lake processors Graphics : Integrated Intel UHD Graphics (UMA architecture) Embedded Controller (EC / KBC) : ENE KB9022Q D
: Measure the voltage at the VCC pins of the SIO chip. It must have exactly 3.3V. Check the power button pin on the SIO; it should drop from 3.3V to 0V when you physically click the laptop’s power button, signaling the chip to start up. la-g121p schematic
When selecting a repair service, ensure they have experience with the HP 15-BS or 250 G6 series. Provide as much detail as possible regarding the fault and any steps you have already taken, as this will help them expedite the diagnostic and repair process.
Since this board supports charging and data transfer over USB Type-C, it features a dedicated Type-C negotiation controller. A shorted capacitor on the auxiliary 3.3V LDO line of this controller will completely disable the board's ability to trigger the primary power sequence. How to Read the LA-G121P Power Sequence Diagram Based on the design architecture of the X1
Most people searching for this schematic are dealing with one of three common "tales of woe": The "No Power" Mystery
The power tree maps how the main input voltage transforms into minor voltages required by lower-power components. When selecting a repair service, ensure they have
: These allow you to locate the physical position of components on the board when their markings are burnt or missing.
The LA-G121P schematic consists of various components, including:
