What Was Happening
A Putney SW15 customer brought in a Sony Vaio with two separate but equally frustrating faults. The Wi-Fi had been dropping connections every few minutes, making the laptop unreliable for any online work. Separately, the battery had degraded to the point where a full charge lasted less than 20 minutes — the machine was only usable when plugged in.
The machine was otherwise in good condition and worth repairing. Both faults were component-level issues that could be resolved in a single visit.
Our Diagnosis
We ran a Wi-Fi adapter test and confirmed intermittent hardware failures on the wireless card. The driver was clean and the router was functioning correctly on other devices — the fault was in the physical wireless adapter inside the Vaio.
We then checked the battery cycle count and health status. The cycle count was well beyond the threshold for reliable capacity, and the battery cells were no longer capable of holding charge effectively. Both components required physical replacement.
How We Fixed It
We replaced the wireless adapter with a compatible unit and the battery with a compatible replacement pack. After installation, we tested the Wi-Fi connection for stability over a sustained period — verifying that it held a connection through normal browsing and downloads without dropping. The battery was tested through a charge and partial discharge cycle to confirm it was charging normally and holding capacity as expected.
Both repairs were completed in a single visit to our Putney workshop.
The Result
The Sony Vaio was returned to the Putney customer the same day. Wi-Fi connection was stable and the battery was holding a full charge as expected. Both repairs were completed during a single workshop visit, saving the customer a return trip.
Why This Happens on Sony Vaio Models
Sony Vaio laptops from this era use internal wireless adapters that connect via Mini PCIe or M.2 slots. The wireless card has a finite service life, and on heavily used laptops, the adapter can develop hardware faults that manifest as intermittent connection drops rather than complete failure. The fault is distinct from driver or router issues because the drops occur regardless of the network being used.
Battery degradation on Vaio models follows the same curve as other lithium-ion batteries — after several hundred charge cycles, capacity drops significantly. Batteries showing high cycle counts and reporting a full charge while delivering less than 30 minutes of use have reached the end of their useful life.
Prevention Tips
- If Wi-Fi drops are appearing on one laptop while other devices stay connected, the fault is almost certainly in the laptop’s wireless adapter rather than the router
- Avoid fully depleting the battery on every cycle — lithium-ion batteries last longer when kept between 20% and 80% charge where possible
- Run the laptop off the charger periodically to keep the battery active; batteries stored at 100% or 0% for long periods degrade faster
- If both Wi-Fi and battery are failing simultaneously, addressing both in one visit is more efficient and avoids bringing the machine back shortly after
- Replacement batteries should be sourced from reputable suppliers to ensure cell quality matches or exceeds the original specification
Local Help in Putney SW15
We carry out Sony Vaio repairs and laptop component replacements at our Putney SW15 workshop. Same-day turnaround is available for battery and wireless adapter replacements when parts are in stock.
Related Services
- Laptop Repair — hardware repairs for all makes and models
- Laptop Repair in Putney — local service covering SW15
More Case Studies
- Asus X200E keyboard replacement in Putney — component replacement at our Putney workshop
- MacBook Pro A1245 water-damaged keyboard replacement in Putney — same-day walk-in repair in Putney
- Sony Vaio NW20SF laptop LCD screen replacement in Fulham — another Sony Vaio repair