gl33ntwine
New member
A 14" MacBook Pro with the base M5 chip was brought in for a display replacement. The display had a crack in the lower-left corner.
We replaced the panel and transferred the required ICs. Everything worked normally afterward - no diagnostic errors, lid sensor was working, etc.
The next day, a strange problem appeared. A couple of minutes after powering on, the laptop would go to sleep roughly every 15 seconds.
The logs show: "Entering Sleep state due to 'Thermal Emergency Sleep"
So it appears to be an emergency sleep caused by overheating. However, the machine is definitely cold and there is no actual overheating.
We removed the panel and connected another known-good one. We also disconnected the lid sensor, but neither made any difference.
Eventually, we randomly discovered that the problem completely disappears when the camera flex cable is disconnected. With the camera/ambient light sensor disconnected, the MacBook no longer goes into sleep.
Has anyone encountered anything similar?
We carefully inspected the flex cable and connectors and everything looks fine. The camera and ambient light sensor themselves also appear to be working normally.
At this point, we're not sure whether the problem is on the logic board or somewhere in the lid assembly. We haven't been able to find another M5 lid to swap for testing, and we don't want to risk connecting a lid from an older model, as there are known cases where doing so can damage/burn the Wi-Fi circuitry.
Any ideas what could cause a camera/ambient light sensor issue to trigger Thermal Emergency Sleep?
We replaced the panel and transferred the required ICs. Everything worked normally afterward - no diagnostic errors, lid sensor was working, etc.
The next day, a strange problem appeared. A couple of minutes after powering on, the laptop would go to sleep roughly every 15 seconds.
The logs show: "Entering Sleep state due to 'Thermal Emergency Sleep"
So it appears to be an emergency sleep caused by overheating. However, the machine is definitely cold and there is no actual overheating.
We removed the panel and connected another known-good one. We also disconnected the lid sensor, but neither made any difference.
Eventually, we randomly discovered that the problem completely disappears when the camera flex cable is disconnected. With the camera/ambient light sensor disconnected, the MacBook no longer goes into sleep.
Has anyone encountered anything similar?
We carefully inspected the flex cable and connectors and everything looks fine. The camera and ambient light sensor themselves also appear to be working normally.
At this point, we're not sure whether the problem is on the logic board or somewhere in the lid assembly. We haven't been able to find another M5 lid to swap for testing, and we don't want to risk connecting a lid from an older model, as there are known cases where doing so can damage/burn the Wi-Fi circuitry.
Any ideas what could cause a camera/ambient light sensor issue to trigger Thermal Emergency Sleep?