I had the Device on inside the case which comes along with it. Heatsink on top and bottom in place and it was working fine. I was in Uboot. then after few mins no response from uart and no display also.
Now it will power on but no display on hdmi and nothing on UART. All it does is heat up under the CPU are if I keep it on for more than a min it will get super hot.
Just found out a new thing about this situation, When I connect uart from pc to device then the windows would crash blue screen of death. If I remove it I can use the PC without any issue. I am not really sure if its the device pulling to much power? AFAIK uart should power isnt connected to the board, just RX, TX and GND.
I tried M-Register to check If I can get it to upgrade mode but no luck.
I can confirm there is something short after I did this.
Just removed the heatsink to check how the CPU gets, I just connected the usb-c and within 2 seconds the cpu was super hot that I couldn’t touch it anymore. I think there is something short.
No, I am an engineer and I know it will blow up if I do that. but 4 days ago I used vim3 khadas power supply official one and it is 5v/9v/12v so assuming it should negotiate first before delivering 9v to the device. The device red light started blinking so I removed it immediately and after that I used my phones normal charger 5v 1a and 2.1a and it was working fine but then after around 3days of using this happened.
is a very bad news. please send it back to me to find out why. and we will send you a new one.
It’s early morning now. Tomorrow I’ll get my colleagues to contact you. thank’s for your help. sorry for the inconvenience.
I have received the your VIM1 for some day. I found that the CPU(S905X) was broken which make the VDD_EE and VDDIO_AO3.3V short circuited. don’t know what caused this.
now, i replace a new CPU, and doing some test:
Short circuit test, is pass
Check all the voltage is correct, also the current is correct.
Do a full test, all function is pass.
Reboot aging test 12 hour, is pass.
play a 4k vedio test 4 hour, is pass
Use 24W power adapter to power on for one hour, the red led flashing, and the Input voltage will not exceed 5V. VIM1_V12 not support the 24W power adapter. after one hour, the CPU works well. it seems not the problem of 24W power adapter.