# Nvidia Jetson Nano fan VCC not getting 5V **URL:** \ **Category:** Jetson Nano\ **Tags:** hw\ **Created:** [April 7, 2021, 9:21am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412 "2021-04-07T09:21:44Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![akshaygugnani15](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@akshaygugnani15](https://forums.developer.nvidia.com/u/akshaygugnani15)\ **Post date:** [April 7, 2021, 9:21am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412/1 "2021-04-07T09:21:44Z")
I bought Dedicated 4020 Cooling Fan for Jetson Nano and after soldering the header , I connected the fan and ran the command “sudo jetson\_clocks” but still the fan doesn’t work . To check the fan I connected it directly to 5V and ground of the 40 pin and it was working fine . Then I checked the voltage on vcc of fan pins and it was fluctuating but the highest voltage was 4.8v which i think is not enough to run the fan , the TACH pin had constant 4.8 v. Can someone help me out here I don’t know what the problem is . ---
**Author:** ![Trumany](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/trumany/32/14043_2.png) [@Trumany](https://forums.developer.nvidia.com/u/Trumany)\ **Post date:** [April 8, 2021, 2:12am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412/3 "2021-04-08T02:12:43Z")
Did you measure the pin 2 of fan header? It should be same voltage level to 5V of 40-pin header as they are from same power rail. ---
**Author:** ![akshaygugnani15](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@akshaygugnani15](https://forums.developer.nvidia.com/u/akshaygugnani15)\ **Post date:** [April 8, 2021, 6:55am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412/7 "2021-04-08T06:55:57Z")
1st pin (GND) - not is continuity with 40 pin header GND 2nd pin (VDD) - having 0V 3rd pin (TACH) - having 4.89V 4th pin (PWM) - is in continuity with GND and 5V of 40 pin header The problem is _**1st pin (GND) - not is continuity with 40 pin header GND**_ AND _**2nd pin (VDD) - having 0V**_ ---
**Author:** ![Trumany](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/trumany/32/14043_2.png) [@Trumany](https://forums.developer.nvidia.com/u/Trumany)\ **Post date:** [April 9, 2021, 1:35am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412/8 "2021-04-09T01:35:09Z")
Are you using devkit carrier board or not? If it is, please refer to P3449 schematic in [DLC](https://developer.nvidia.com/embedded/downloads) for fan header connection. It should be connected well on devkit carrier board. If it is not, maybe it means the soldering work is not so good. ---
**Author:** ![akshaygugnani15](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@akshaygugnani15](https://forums.developer.nvidia.com/u/akshaygugnani15)\ **Post date:** [April 9, 2021, 6:03am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412/9 "2021-04-09T06:03:52Z")
Yes I am using devkit carrier board. It might be the soldering as my soldering ion is oxidized , and so the solders are not good enough . ---
**Author:** ![nadeemm](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/nadeemm/32/367020_2.png) [@nadeemm](https://forums.developer.nvidia.com/u/nadeemm)\ **Post date:** [October 15, 2021, 3:59am UTC](https://forums.developer.nvidia.com/t/nvidia-jetson-nano-fan-vcc-not-getting-5v/174412/11 "2021-10-15T03:59:32Z")