ASUS ROG Ally X Error WHEA_UNCORRECTABLE_ERROR: APU Power Delivery Trip 30W
Hardware-level exception (0x00000124) triggered by transient voltage sag (Vdroop) or current limit tripping on the APU VRM VCORE/VSOC rails during 30W Turbo Boost phase transitions. The system watchdog resets the APU to prevent silicon damage due to power rail instability.
Hardware Diagnostic Matrix
Spec Ref #688ad414Required Diagnostic Tools & Instrumentation
Multimeter Probing Targets & Circuit Tolerances
Bench Calibrated ±5%| Test Point / Circuit | Target Nominal Spec | Expected State | Fault Condition |
|---|---|---|---|
| Main Logic DC Bus | 3.3V / 5.0V DC (±0.1V) | Stable DC Potential | <2.9V (Brownout / Sag) |
| Thermistor / NTC Sensor | 10kΩ - 100kΩ @ 25°C | Smooth Thermal Curve | 0Ω (Short) or ∞ (Open) |
| Safety Ground / PE Continuity | < 0.5Ω Resistance | Solid Earth Bond | > 1.0Ω (Floating Chassis) |
Common Symptoms & Fault Manifestations
- Immediate BSOD (Stop Code: WHEA_UNCORRECTABLE_ERROR) within 30-120 seconds of engaging 30W Turbo mode
- Spontaneous power-off or reboot under heavy combined CPU/iGPU transient loads
- Windows Event Viewer logs Event ID 18 or 19 reported by GenuineIntel or Processor-Core/APU Machine Check Exception
Root Causes & System Failure Modes
VRM phase degradation or dry solder joints across the VCORE multi-phase buck inductor/MOSFET array causing excessive Vdroop below the 0.75V floor under transient 43W fPPT bursts
Thermal throttling of the VRM power stages (DrMOS) due to degraded thermal putty/pads exceeding 105°C OTP limits
Degraded or unstable USB-PD 65W/100W input voltage rail causing PMIC buck controller negotiation instability
High-Voltage & Mechanical Safety Isolation
Prior to opening access panels, disconnecting terminals, or probing wiring, perform complete lock-out / tag-out (LOTO). Disconnect all AC mains, DC string isolators, and lithium battery banks. Allow internal smoothing capacitors at least 3 to 5 minutes to dissipate stored residual energy below safe threshold (<30VDC).
Step-by-Step Diagnostic & Resolution Procedure
Safe Isolation & Power Cut
Power off the ROG Ally X completely. Disconnect the USB-PD charger. Place the unit on an ESD-safe mat, remove the back cover screws (observing the pop-up retaining screw at bottom-right), and immediately disconnect the main 80Wh battery connector from the motherboard to avoid shorting power stages.
Physical & Multimeter Inspection
Inspect APU VRM inductors and DrMOS packages for discoloration, cracked joints, or blown bypass decoupling caps. Measure passive resistance to ground on the APU VCORE and VSOC rails; normal resistance should measure typically 1.2 to 3.5 Ohms on low-resistance APU rails. A dead short (<0.3 Ohms) indicates a punctured MOSFET.
Thermal Interface Renewal & Solder Reflow
If no direct short is detected, scrape away dried OEM thermal putty from the inductors and DrMOS stages. Clean with 99% IPA. Apply fresh non-conductive high-performance thermal putty across all VRM MOSFETs and inductors. Reflow suspect fractured micro-capacitors in the decoupling network (SP-Caps/MLCCs) on the APU reverse side. Re-seat the APU heatsink with PTM7950 phase-change material.
Recalibration & Verification
Reconnect the battery, install the chassis, and plug into an official 65W/100W ASUS ROG power adapter. Flash the latest BIOS via ASUS EZ Flash to update AMD AGESA microcode for improved VCORE voltage-frequency curves. Boot to Windows, set 30W Turbo profile in Armoury Crate, and execute a 15-minute 3DMark Time Spy stress loop while logging HWInfo64 VRM temperatures and VCORE rail stability.
Hardware Reset & Fault Clear Sequence
Controller ProcedurePrevention & Routine Maintenance Guidelines
- Avoid running continuous custom manual profiles above 30W sustained APU TDP without high-speed custom fan curves.
- Always use the official ASUS 65W/100W PD 3.0 compliant AC adapter to ensure stable 20V input rail feeding the charging buck controller.
Frequently Asked Diagnostic Questions
What does error code WHEA_UNCORRECTABLE_ERROR indicate on ASUS ROG Ally X?
Hardware-level exception (0x00000124) triggered by transient voltage sag (Vdroop) or current limit tripping on the APU VRM VCORE/VSOC rails during 30W Turbo Boost phase transitions. The system watchdog resets the APU to prevent silicon damage due to power rail instability. In engineering telemetry, it indicates apu power delivery trip 30w requiring circuit verification.
What are the primary triggers causing error WHEA_UNCORRECTABLE_ERROR?
Diagnostic bench telemetry isolates the following common root causes: VRM phase degradation or dry solder joints across the VCORE multi-phase buck inductor/MOSFET array causing excessive Vdroop below the 0.75V floor under transient 43W fPPT bursts; Thermal throttling of the VRM power stages (DrMOS) due to degraded thermal putty/pads exceeding 105°C OTP limits; Degraded or unstable USB-PD 65W/100W input voltage rail causing PMIC buck controller negotiation instability.
How do I reset and clear ASUS error WHEA_UNCORRECTABLE_ERROR?
Disconnect the AC adapter. Press and hold the Power button for 40 seconds to fully discharge motherboard flea power and clear the EC (Embedded Controller) state registers. Reconnect the charger and power on. If the error status repeats immediately after clearing, discontinue clearing and test circuit continuity.
Can I safely resolve error WHEA_UNCORRECTABLE_ERROR without specialized shop tooling?
This fault is graded as Advanced difficulty with Critical severity. Standard diagnostics require an insulated digital multimeter and appropriate hand tools. Always observe high-voltage isolation procedures.