ASUS ROG Strix G16 G615: Diagnosis for Sudden Shutdown

⚠️ SAFETY WARNING / FIRE HAZARD. This device contains lithium batteries. Improper puncturing or bending during disassembly can cause explosions or flames. The intervention requires precision and the assistance of a specialized technician is recommended. ReeFix provides this diagnosis EXCLUSIVELY for educational and informational purposes.

CHECK 1: Initial Power and Signs of Life Assessment

Objective: Determine the presence of a primary short circuit or a power supply failure.

Procedure:

1. Disconnect/Reconnect: Disconnect the AC adapter from the laptop and the power outlet. Wait 10 seconds, then reconnect it firmly. Observe if the charging LED on the laptop (if present and working) lights up.
2. Alternative Power Supply Test (if available): If you have a compatible and working ASUS ROG power supply (same voltage and amperage, typically 20V and high current), try using it.
3. Observe Reaction: Press the power button for 5-10 seconds. Listen for any sounds (fans, drives) or if any LEDs briefly light up.

Key Signs/Indicators:

• Total absence of LEDs: The DC-in charging LED remains off even with the power supply connected.
• No reaction: No sound, no fans, no LEDs, no response to the power button.
• Cold power supply: The external power supply does not heat up at all, indicating zero current draw.

Probability: A clear short circuit on the main line (20V) is the most probable cause (60-75%) if all signs of life are absent and the charging LED does not light up. This indicates that the laptop's protection circuit has blocked current input.

Decision: If the original power supply is proven to be working (tested on another device or with a tester) and the laptop shows no signs of life, an internal fault is highly probable. Do not attempt self-repairs; consult a technician.

CHECK 2: Main Line Short Circuit Analysis

Objective: Confirm the presence of a short circuit on the B+ line and its severity.

Technical Context: In laptops like the ASUS ROG Strix G16, the total absence of signs of life, including LEDs, suggests that the main 20V voltage is not reaching the motherboard. This happens because the charging chip detects an anomalous resistance (short circuit) and activates the input MOSFETs to block current flow, protecting the power supply and preventing further damage.

Output for technician (Synthetic Handoff):

• Symptoms: Sudden shutdown under load, total absence of signs of life, DC-in charging LED off even with original power supply connected. Current draw from the power supply is 0.00A.
• Suspected Fault: Clear short circuit to ground on the main system power line (B+ / VIN / 20V Rail).
• Required Diagnostic Methodology:
• Measurement of resistance to ground on the main B+ line shunt resistor.
• If short circuit (<1 Ohm), perform controlled voltage injection tests (max 1.0V, limit 1.5A) to locate the faulty component.

Probability: This condition is almost certainly (85-95%) due to a short circuit on the main line. Often happens when: The device has been subjected to intense workloads, vibrations, or has experienced abnormal overheating.

Decision: This check requires opening the laptop and using specialized instrumentation (multimeter, bench power supply). It is essential to consult a specialized technician to avoid irreversible damage.

CHECK 3: Identifying the Short-Circuited Component

Objective: Locate the specific cause of the short circuit, which will influence repair costs and feasibility.

Causes and Probabilities:

1. Thermal failure of VRM DrMOS (45-55%): The voltage regulator modules (VRM) of the CPU or GPU, subjected to extreme workloads, can suffer structural thermal failure, creating a clear short circuit to ground on the main line.
2. Liquid metal migration or leakage (25-35%): The ASUS ROG Strix G16 G615 uses Conductonaut Extreme liquid metal for dissipation. If the protective seal fails or if the laptop undergoes strong mechanical stress, the liquid metal (highly conductive) can migrate onto adjacent SMD capacitors, causing an immediate short circuit.

This phenomenon often manifests as sudden shutdowns under stress and a total refusal to power on, leaving the PC completely dead. If you suspect a leak, absolutely avoid shaking or repeatedly turning on the laptop to prevent extending the damage to adjacent logic components.

3. Short circuit on input MOSFETs or filter capacitors (15-20%): A failure of the input MOSFETs (which manage switching between battery and power supply) or the multilayer ceramic capacitors (MLCC) on the main 20V line.

E-E-A-T Technical Note: Unlike previous G614 models (2023-2024), known for a design flaw where a left fan screw caused a short circuit by puncturing the PCB, the G615 model (2025/2026) features a redesigned internal layout that resolves this specific vulnerability. Therefore, short circuits on the G615 are almost exclusively thermal in nature or related to liquid metal migration.

Tools Needed (for the technician):

• Professional Digital Multimeter
• laboratory bench power supply
• diagnostic thermal camera for electronics
• Hot Air Soldering Station
• Amtech Soldering Flux

Safety Notes: Voltage injection to locate the short circuit must be performed with extreme caution to avoid damaging the CPU/GPU.

Estimated Costs (component/repair only):

• Short circuit repair (VRM/liquid metal): 150-350 euros (requires specialized micro-soldering and thermal insulation restoration).
• ASUS ROG Strix G16 G615 Motherboard Replacement: 600-1000+ euros (due to the presence of integrated high-performance Intel Core Ultra CPU and NVIDIA RTX 50 series GPU).

Decision: Fault localization is critical. Once identified, the technician will assess the cost-effectiveness of the repair.

CONCLUSION

Given the symptoms of sudden shutdown with no signs of life and no current draw, the highest probability (60-75%) is a clear short circuit on the main 20V power line.

1. Consult a technician (Highly Recommended): This is the most sensible decision. Checks 2 and 3 require specialized instrumentation and advanced micro-soldering and electronic diagnostic skills. Attempting a self-repair without the proper skills and tools carries an extremely high risk of irreversible damage and danger (explosions/flames).

• Costs: A targeted repair of a short-circuited component (VRM, liquid metal restoration) can range from 150 to 350 euros. If the short circuit has severely damaged the multilayer PCB or the main chips (CPU/GPU), replacement of the replacement motherboard for ASUS ROG Strix G16 will be necessary, with costs that can exceed 600-1000 euros for the part alone.

2. Replace the device (Consider in case of extensive damage): If the technician diagnoses extensive damage to the CPU/GPU or the multilayer PCB, or if the cost of motherboard replacement approaches the value of a new laptop, replacing the device might be the most economical and reliable long-term option.
3. Repair yourself (Not Recommended): This option is strongly discouraged for this type of fault, unless you possess professional skills, specific experience in micro-soldering on laptop motherboards, and all the listed instrumentation.

Operational Decision: If the device shows no signs of life and the charging LED is off, immediately consult a specialized technician for an in-depth diagnosis.