Engineering Room Mac computer repair specialist, we are here for you. Any issue with your device we can fix it in a bit. Needing some training? More information: 🖥 Website: https://engineeringroomrepair.com/ 🚺 Email: help@engineeringroomrepair.com 📲Facebook: @ERMacServices 📸 Instagram: https://www.instagram.com/ermacservices/ ✔Google: https://g.page/ERmacservices?gm HaWhatsApp: + 1469-558-0125 TubeYouTube http://bit.ly/38FpREK. - 📹 Subscribe to our channel: http://bit.ly/38FpREK. MacBook Pro 13.3” Model: A1278 820-3115 Year: 2012 Issue: Fan always spinning at 6000 rpm. - It was a very simple repair process. If you are reading schematics and if you know how to use your equipment it will be simple for you too. This MacBook came from a regular customer, he explained to me that this logic board started to fail a couple months ago, but he wasn’t ready to fix it. Fan was going to 6000 RPM and it makes it loud and a little slower. I decided to make a video explaining the regular repair process. So I went directly to the fan connector and I found the SMC_FAN_0_CTL was going from 1.6V to 3.7V for not real reason. To get this conclusion i did test all the resistors and the Q5660. After checking and testing in 2000 RPM and 6000 RPM I get that SMC is taking the wrong decision. I decided to replace it and well you can see everything in the video. Enjoy!