until recently I experience something rather annoying (and troublesome) with my laptop: it spontaneously shuts down itself without any warning, and restart right after that. No blue screen, no hanging program, just everything is going on smoothly, then the computer shut down like a desktop facing power fails, without UPS.
Here's my laptop's conditions and my guess:
- It's rather new (model Asus K53SV, I bought it this time last year). Running core i5 2430M, 8GB RAM; OS Win 7 Ultimate 64 bit, SP1.
- The shutting down occurs randomly, not too frequently (may be once a week, maybe 3 consecutive days, once a day, may be 2 days OK than happen the next day,...) but recently it happened more often.
- I always use my laptop with the battery installed, and one AC line. The battery will be charged fully to 100%, then the computer states that it's running on AC line. After a few days, when the battery level drops below 95%, the charging will begin again until 100%.
- The shutting down occurs even when th battery is fully charge, and the laptop is on AC line.
- No problem with Windows after the event, I start in safe mode, then restart again to make sure everything is OK. In the Event Log of windows 7, it store faults related to "Kernel Power Failure" or something
- I use the laptop on battery once or twice a month, making the battery drain to below 10%, then charge it to 100%.
- Please don't tell me that this is the overheating problem. It's winter in here. The ambient temperature is about 17 oC, and the Aida64 report CPU & GPU temp of 46 oC, fan speed 100RPM. When I stress the CPU to test, the fan speed adapts quickly, it can reach 3800-4300 RPM, and the CPU temp never gets higher than 70 oC.
So here's the question: What unit/chips control the current between the adapter output, the battery and the mainboard? Is it the role of the chip inside the battery? Can a faulty battery the cause of the problem, e.g "the 'digital' switch back and forth" to control the current got problem?
- For now I uninstalled the battery, running on adapter only. However, due to the randomness of the shutting down, I need to check on this condition at least 4 or 5 days to narrow down the possible cause. Just don't want to make my laptop running on AC line only in such a long period, because I don't have UPS.
Any experience or explanation would be appreciated. Thanks.