Chosen Solution
Hi guys! I have a problem with my Macbook Pro. When I start up my Mac fans starts spinning at 6200RPM and it becomes freaking slow, even the cursor starts lagging. I checked the temps on an older iStat, and I find that when the Northbridge 2 shows temp between 30-50 degree Celsius than everything works fine, but when it shows 128 degree the problem happens. Where is this sensor? How can I fix it? I attached a picture of the iStat temps, the other 129 degrees doesn’t cause the problem as they always show that, only the Northbridge 2 slows my Mac.
If the PCH sensor reaches 120+ C. your problem is not the sensor, no more than a wet rag is, when a pipe is dripping. Try dowloading also Macs fan control to get confirmation it’s a temperature issue, but if that’s the case your problem is likely coming from a shorted IC or a power line feeding it. There’s around a number of those boards saying goodbye because of PCH, not a very big surprise unfortunately. A replacement of the chip or the logic board might be necessary.
