I have khadas VIM2, and decided to use it as a home file storage based on Ubuntu Server with an external hard drive. The hard drive will consume additional power, so I need to provide khadas extra power. For this, I bought a switching power supply Mean Well NES-15-5, its characteristics can be found here.
And also, the Amlogic s912 heats up very much when it work, so I decided to make a big aluminum radiator and bought a fan, which runs from 5v and consumes up to 140mA.
When I prepared everything and connected it, I found a couple of problems:
The cooler was connected with 2 Pins 0.8mm Pitch JST Header to the Cooling Fan connector, but after turning on the device, the fan does not rotate (when connected to a separate 4.5V supply, it works). I measured the voltage on the Fan port, it varies between 0.6 and 1.6 V. What did I do wrong and why fan doesn’t rotate?
The External Power Supply I connected with 4 Pins 1.25mm Pitch JST Header, and adjusted the voltage at 5V. The external hard drive is connected to the USB port closest to the USB-C port. After the power on, the VIM2 indicator lights up, it starts boot up, the HDD box indicator lights up, but the hard disk’s spindle does not twist and clicks are audible. I think that the drive does not get enough power, but if VIM2 gets power using USB-C from 5V/2A AC adapter - in this case the HDD works fine. Why is this happening? The HDD box is connected using a cable male-USB 3.0 micro-B - USB Type A.