Chosen Solution
Yo I have a Xbox 360 FAT from july 2007 , 30s after the boot she give me 2 red lights ,the problem don’t come from the thermal grease but from the temp sensor, so i have the question : Where is located the temp sensor and can i fix it ?
The sensor is in the chip. If you need to ask, you can’t fix the sensor. Actually why fixing the sensor when it is working correctly to tell you there is a problem? Apply new thermal paste and re-seat the heatsink.
