If Macbook Pro A1502 13 inch retina is loud or fan running faster and OS loading Bar slow then there is some thing wrong with sensors or shortage in motherboard. Mostly problem creates due to water damage, So we need to check it properly to fix the device. So Follow the instructions step by step to solve fan fast speed in macbook pro retina 13 inch.
If your Macbook Pro fan is loud most of the time, it may indicate its running faster than it should be, or there is something triggering it to do this.
- Make sure it is not clogged with dust. Fans are noisy when they have to run faster, and it may be running faster because its clogged with dust. Dust will dramatically reduce the effectiveness of your Macbook Pro fan. It is quite easy to clean a Macbook Pro fan, you can even try to do it without opening your Macbook Pro by using a can of compressed air and pushing the air through the vents at the back of your Macbook Pro.
- If you are using external displays. Macbook and almost of Mac fans would be noisy if you’re connecting external displays, especially high resolution ones because your Graphic Card will be working with max performance which will make the fans noise. Like, if your Macbook supports max 2 external displays with max resolution at 2k / each, then if you connect only 1 display – it would be fine, but if you connect 2 external display at 2k resolution -> Your fans maybe noisy then. The solution here is connecting less external displays or lower resolution, or if you really need those high resolution external displays, upgrade your Macbook then.
- You may need to replace the fans. Old fans are typically louder than new ones. If your fans are always noisy, even when not running very fast, this would indicate that the fans have simply worn out.
Remove the logic board and check the bottom for liquid damage, especially around the SMC and top right, where the CPU thermal sensors are.
Check the trackpad cable pins and trackpad board for liquid damage or burnt pins. If there are either, you will need to replace these (and remove the battery to do so).
Regarding ALS not working, chances are the screen has been replaced before with a bad refurb. With the screens on eBay, a lot have this issue, so you have to push and cover the ALS for it to work sometimes (light shines through from the screen to the sensor, preventing it from reading dark enough to light the keyboard). No way to resolve this unless you want to remove the LCD panel and put a bit of foam between the ALS and backlight sheets, or replace the whole assembly.
Most likely it is the track pad or liquid damage around the SMC.