Check for liquid spill corrosion around the audio IC, LVDS/EDP screen connector, and charging area.
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| Rev | Date | Description of Change | Engineer | Verified By | | :--- | :--- | :--- | :--- | :--- | | 19 | 2023-05-12 | Updated Timing IC component value for stability. | J. Doe | M. Smith | | | 2024-05-20 | Final Verification Release. Corrected Output Relay driver trace routing. Added Snubber protection network. | J. Doe | M. Smith | lae791p rev 20 schematic diagram verified
Use a thermal camera or the rosin injection method to locate shorted MLCC (Multi-Layer Ceramic Capacitors) filtering the +B line near the 3V/5V step-down controllers. 3. Failed Charging IC (ISL88739A)
Dual-channel DDR4 SODIMM slots supporting up to 2400MHz/2666MHz. Check for liquid spill corrosion around the audio
Once all voltages are stable, the system releases PLTRST# (Platform Reset), allowing the CPU to execute code from the main system BIOS. Common Hardware Faults on the LAE791P Rev 2.0
Completely dead laptop with no status LEDs, drawing zero current (or minimal current like 0.01A) from the power supply. Corrected Output Relay driver trace routing
When an engineer stamps "LAE791P REV 20" as verified, it means:
: The schematic reveals a complex power management system. In this story, a tiny, microscopic capacitor near the Sky Lake-U CPU
A resistor or capacitor labeled R102 in Rev 1.0 might have a different value or be removed entirely in Rev 2.0.
Since many of these boards use USB-C for charging, the controller chip (TPS65982 or similar) frequently fails due to voltage spikes. 5. How to Use the Schematic for Troubleshooting Identify the Symptom: (e.g., No Power). Check Main Rail: Search for B+ or +19V in the PDF.