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April 18th, 2024 20:41

Dell Inspiron 15 3511 Support Assist On Board Diagnostics freezes during boot up. Fan locked on high speed wont shut off

My Dell Inspiron 15 3000 Support Assist On Board Diagnostics freezes during boot up. The fan locks on high speed wont shut off no matter what I do. I have updated the BIOS, all recommended drivers, no luck. The computer will run very slow. I am seeing on the internet, many people are having this trouble. Isn't there a fix for this? I have tried all the recommendations posted here with no success. Can anyone help out? The fan runs full speed constantly, very loud. The computer is stone cold.

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April 21st, 2024 00:19

I have solved my issue with this. When running boot up diagnostics (F12 during boot up) on the fan, when it fails the quick test enter the advanced testing. The fan test will request a RPM from the fan. The fan must send back the correct RPM for the requested RPM. In my instance the fan test requested 3600 RPM and the detected RPM was 0. The fan was now running wide open in its default, but indicating it was not running. The computer will detect a fan malfunction and slow everything down to save the processor.

I called Tech support for a new fan. I was told they were out of stock and that I needed to cal back in 5 or 6 days and check again...???... I bought a genuine replacement for under $10 delivered the next day from AMZ. I received the exact same fan as the one in my laptop. I also received a small amount of Thermal Paste. That was a very good thing. When you replace the fan it has a "duct work" and an air to air cooler attached to the laptop, that cools the Chipset. The one fan does it all. You Need To Remove that long slender duct and clean and reapply the thermal paste. A lot of it. The original job on mine was very poor. Not much there. It had dried, hardened and become useless. I was fighting two issues. The computer was progressively getting warmer from the paste break down, and the fan had stopped returning the RPM signal. I hope this helps someone.

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