Machine:
MacBook (White or Black)
Symptom:
Screen goes dark and computer enters sleep mode while in use. You can wake up the computer by pressing the space bar, but it may go back to sleep in a few minutes.
The symptom usually manifests itself after extended, processor intensive use (i.e. watching videos full screen encoded in Flash.)
Possible Cause:
This is most often triggered by the computer thinking that it is overheating. Going into sleep mode is meant to help cool the computer and protect vital components from damage.
This can be caused by the failure of the main fan, an error with the temperature sensor, heatsink issues, or an issue with the logic board itself.
Solutions:
The easiest “solution” is to shut the computer off and wait for it to cool down.
You can also restart the machine and listen for the fan. If you hear the fan roaring at startup, then at least you know that the fan is working. At this point, the computer either thinks it’s too hot because of a faulty temperature reading or it is just plain too hot.
Often, the best fix is to clean and re-apply new heat-sink compound to the processor/heat-sink. This requires removal of the top case, disconnection of some delicate cables and components and a static-free environment. We recommend that a authorized technician perform the work. When we do this, we also clean out the fans and vents for optimal air flow.
The temperature sensor may also be the culprit. Sometime these can come loose or fail and are available for replacement. Once again, a little involved and the sensor is an Apple service part.
If distorted or choppy video is noticed as well, there may be an issue with the logic board itself. This is usually not the original cause of the overheating, but may manifest itself if the MacBook has been overheating for a long time. The solder (glue) that connects the GPU to the logic board can become weaker with repeated high temperature fluctuations. Once the connections become weak, the video can distort or cut out.
Keeping your MacBook as cool as possible and shutting it down or sleeping while not in use is the best way to extend it’s life. If your MacBook is running hot with the fans on high, try to keep it elevated where air can flow underneath (i.e. not on a comforter.)
The best option if your MacBook is continually going to sleep while in use is to have a free diagnostic performed to learn what exactly is causing the issue and options for having it repaired. Feel free to contact one of our Service Advisors with any questions.
[ MacBook Free Diagnostic ]