Power supply trips or goes into overcurrent protection immediately when plugging in the laptop.
: A common failure point identified in community repairs is the PQA1 chip (a dual transistor like the PE642DT), which can cause low resistance and prevent the board from powering on.
What the laptop is showing (e.g., blinking lights, won't turn on, fan spin only)? If you have found any visible damage or burnt components? What voltage readings you’ve already taken?
: Identified as a PE642DT dual transistor. Faults in this chip often cause a "no lights" or "no power" symptom even if 19V is present at the input. la-e801p rev 2.0 schematic
: Low resistance on this coil may indicate a fault in the PCH or related power circuitry. Accessing the Full Schematic
This article explores the key components, architecture, and common troubleshooting steps found within the LA-E801P Rev 2.0 documentation. Overview of LA-E801P (CSL50/CSL52) Go to product viewer dialog for this item.
Since the is not a consumer-grade product (like a sound card or GPU) but rather a bare logic board/controller PCB typically used in industrial computing, LED display control, or embedded systems, writing a "user review" requires a technical perspective. Power supply trips or goes into overcurrent protection
Detailed drawings of the Buck Converters for CPU Core (VCC_CORE), DDR, and System Agent.
If you need a specific section—such as the thermal model or the control‑loop design—let me know and I can point you to the relevant pages.
Without an engineering circuit diagram, resolving structural power rails or component failures on multi-layer PCBs is nearly impossible. This comprehensive guide details the motherboard's architectural ecosystem, traces critical voltage steps, and outlines diagnostic routines for common board-level problems. Motherboard Architecture Overview If you have found any visible damage or burnt components
Integrated Intel Core i3/i5/i7 (7th Gen Kaby Lake-U). Memory: Onboard LPDDR3 RAM (non-upgradeable). Charging: USB Type-C Power Delivery (PD) system. Graphics: Integrated Intel HD Graphics 620. Common Repair Scenarios for LA-E801P
: Because the firmware sequence relies on active handshakes with the EC chip, a corrupted system image can stall the booting process completely. Technicians frequently resolve these un-triggered states by downloading verified working bin dumps from repair hubs like Badcaps Forum or Elvikom and rewriting them with an external SPI device. Correlating Schematics with Boardviews Document Type Primary Engineering Value Practical Field Use Cases LA-E801P Schematic (PDF)
Since this board charges via USB-C, the PD Controller (often a TPS series chip) frequently fails. The schematic helps identify the CC1/CC2 lines and the 20V input rail.
Search for KB9022 in the schematic. Verify pins like VCC (power supply), WRST# (Reset signal), and EC_RST# . If the EC is not getting power or remains locked in a reset state, it will never assert the PM_PWRBTN# signal to wake the Intel CPU.