At Reformtech, we specialize in diagnosing and repairing complex laptop issues that other service centers might turn down.
Table of Contents
Initial Diagnosis and Observations
Receiving the laptop, the first thing we noticed was that it had been tampered with before. Certain indicators, such as misaligned cables and prior attempts at disassembly, suggested previous unsuccessful repair attempts. Nevertheless, we proceeded with our own diagnosis.
The first step was checking for a short circuit. Asus laptops are among the most frequently repaired devices at our shop, and we know common failure points. We identified the power connector and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) responsible for power regulation. A quick check with a multimeter confirmed a dead short on the drain of the second MOSFET, which is a significant clue.
Voltage Injection and Thermal Imaging
Before wasting time on a surface-level inspection, we used a voltage injection technique combined with a thermal camera to locate the failing component. The thermal camera immediately highlighted a hotspot near a MOSFET, indicating that it was absorbing excessive power and causing the short.
While the MOSFET itself was overheating, we couldn’t conclude it was the root cause without further testing. Nearby capacitors could also be responsible, so we systematically desoldered and tested each component. After removing and testing the capacitors, the short persisted, pointing to the MOSFET as the likely culprit.
Component Replacement and Further Testing
Rather than spending unnecessary time theorizing about the exact cause of the failure, we opted for a practical approach—removing and replacing the affected MOSFET. Once replaced, we rechecked the circuit, and the short was gone. This confirmed that the MOSFET had failed.
To ensure the repair was successful, we reassembled the Asus laptop and connected the battery. At first, the device showed no signs of life, but after reconnecting the RAM, a white power indicator light appeared. However, the laptop still wasn’t displaying an image.
A crucial oversight was discovered—during testing, the heatsink had been removed. Many modern Asus laptops have thermal protection mechanisms that prevent booting without proper heat dissipation. Temporarily pressing the heatsink onto the CPU and GPU allowed the laptop to boot successfully, confirming a working repair.
Final Testing and Quality Assurance
After reattaching the heatsink properly, we powered on the laptop again. The fans spun up, the power indicator stayed on, and the display functioned correctly. To confirm stability, we ran stress tests for an hour using a Google timer—if the Asus laptop restarted, the timer would reset, indicating an issue. However, the device remained stable, proving the repair was successful.
How to fix Asus Zephyrus Laptop No Power On 2025
the first thing we noticed was that it had been tampered with before. Certain indicators, such as misaligned cables and prior attempts at disassembly, suggested previous unsuccessful repair attempts. Nevertheless, we proceeded with our own diagnosis.
Conclusion
This repair showcased the importance of expert diagnostics, the right tools, and practical problem-solving skills. Many repair centers focus on simple component replacements, but Asus motherboard-level repairs require a deep understanding of circuitry and precision techniques. At Reformtech, we take pride in our ability to fix issues others cannot. If you have a dead laptop that other service centers have given up on, bring it to us! With our advanced repair capabilities, we can get your device back to life quickly and affordably. Contact us at 8100257620 or visit us at our Kolkata location.
ReformTech is a highly reliable Laptop and Smartphone repair service provider that offers on-site repairs for various brands. We specialise in fixing hardware issues, including screen replacements, keyboard replacements, RAM upgrades, SSD upgrades, and even motherboard repairs
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