The schematic is the "blueprint" for this board. It is used by technicians to trace power rails, identify blown components, and understand the communication between the CPU, GPU, and BIOS chip. 🛠️ Board Specifications Manufacturer: Model Name: PCB Part Number: Processor Support: Intel Broadwell/Skylake (U-Series)
The ENE KB9022Q chip on this board contains internal flash memory.
A portable workstation like the ZBook 17 G3 relies on an intricate, multi-stage power rail deployment scheme. When troubleshooting common symptoms like a , the schematic acts as a roadmap to measure voltage rails chronologically: Always-On Rails (G3 to S5 State)
The APW70 LAC391P schematic boasts several key features that make it an attractive solution for portable power applications:
Locate the two input N-Channel MOSFETs near the charging IC. Check if the Gate voltage is being pulled up to roughly 25V by the charging controller. If the gate voltage is low, replace the charging IC or check its ACIN/ACOK pins. Step-by-Step Diagnostic Strategy Using the Schematic
Dynamic voltage rail powering the Intel SoC processor, managed by a dedicated multi-phase PWM controller. 3. Common Failure Points on the APW70 LA-C391P
Generates standard system rails including +3VS5, +5VS5, +1.2V (DDR4), and CPU Core VCC.
This circuit is managed by an island charger IC (typically an ISL or BQ series controller).
This indicates over-current protection (OCP) or short-circuit protection (SCP) triggering. Use a multimeter in continuity mode to measure the resistance between the output inductors of the APW70 circuit and ground. A reading below a few ohms (excluding CPU/GPU rails) suggests a shorted ceramic capacitor or a blown high-side MOSFET. 3. Missing Secondary Rails
The APW70 LA-C391P is the primary motherboard for the laptop, a high-performance mobile workstation often equipped with Intel Core i7 processors (i7-6820HQ) or Intel Xeon E3 processors, paired with DDR4 memory. This board number is used across various models, with part numbers like 848304-601, 848306-601, or 848302-001.
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