Chosen Solution

Hi there, Today I installed a brand new display/lid assembly using the guide here on iFixit. The laptop (besides the screen) was working fine before I attempted repairs, I had it plugged into an external monitor and all was working as normal. However after completing the replacement successfully (screen now 100% working) there is a new problem! Upon turning the Air on the fan speed keeps increasing until it reaches max rpm (so loud!!) and the Yosemite loading bar crawls at an absolute snails pace (taking maybe 2-3 mins just to boot) but even the mouse cursor is extremely laggy etc. I have read on another forum post (in that case the air had been liquid damaged) that it’s an SSD issue, but my Air has had no liquid damage and was working normally before this repair! Steps I have taken to try and solve the problem so far: SMC reset Removing cpu fan cable and reinserting into logic board Removing ssd, wiping connector, socket + solder points with isopropyl and reinstalling onto logic board Can anyone help? Thanks in advance :)

Hi I had the similar issue! This page did point towards a solution. After replacing broken screen of my Imac 27” late 2015, it was really slow where the system usage at idle was over 60% and the fan was at full speed 3600rpm. On the apple troubleshoot scan result I got a error code PFM006. Which is an error related to CMS. I tried resetting the CMS, but no luck. Later after reading more a though I have damaged the HHD, so I opened to swap the HDD from another MacPro Desktop to see if CPU usage drops, but no luck. Got to reseaching more and I landed here so I checked for sensors and I noticed I did not swap the screen sensor from the old screen! I placed the sensor into the new screen, booted and it was working normal speed, cpu usaged drop below 3% and the fan was working at normal rpm. So if you get similar error please check all temp sensors! :) Best regards, Fredy

I think I might have discovered the source of frustration here. I ran into the same issue after replacing the display on my wife’s late 2014 MacBook 13". The display replacement went great thanks to the iFixit detailed instructions, but when I reassembled and turned it on I got the high fan RPM symptom and throttled CPU symptom. Googling the problem showed me that I wasn’t the only person this had happened to, however, it didn’t seem that there was a definite fix, except letting the Apple techs have at it. I remembered, during reassembly, having a bit of difficulty getting the camera cable inserted, and remembered thinking that I was having to use far too much force to get the connector to seat. I had inserted the connector in the orientation in which it laid naturally on the logic board assuming that it was correct. I also recalled seeing the gold pins of the camera connector during disassembly of the faulty display facing me when I removed the cable. So I flipped the cable over and it slid easily back into the connector and seated securely without force. Voila! Everything is working perfectly now. Anyone attempting to replace the display on a late 2014 MacBook 13" should be aware of the fact that the flat camera cable might not be oriented the correct way for insertion. Make sure the gold contacts are facing you when inserting!