Jakub Bandola

I test just now these dongles against each other and it work. I was checking for voltage drops/stability on the pin header of the SBC.

baudrate is 115200, based on shortest pulse method that show 8 us

I already tried to figure out the baud rate, but I was trying to identify whole byte, without success, I will try it with the shortest pulse method, that is simple and clever. I am pretty sure that USB on my PC provide more than 2A without any special conditions, because it can charge tablet faster than 2A charger, over two wire cable. And it behaved the same when connected to laboratory PSU with limit 30A.

mostly PC USB charging port rated at 3A by motherboard manufacturer, it is USB port on same computer as the serial console, so GND should be the same. Orange Pi Lite do not support powering from mUSB port, or at least it is written, I do not try that.

I know how to connect uart, in case of wrong connection there would be nothing coming at all, because if rx and gnd produce no data to read. I rechecked everything multiple times before I post there. These "random symbols appear at about same time as text on screen.

I tried with same settings, but the result is same

I am not home currently but I try to answer most question. I use etcher to write and verify SD card, I also tried 2 other programs, but without success and etcher just look best. For the PSUs hobby PSU from local store rated at 2.1A, tablet charger rated at 2A, Laboratory PSU rated at 30A, and mostly PC USB charging port rated at 3A by motherboard manufacturer, no cheap PSU from alliexpress. I checked the output of these PSUs with oscilloscope to be sure the power is stable, and there are no drops in voltage. I buy one SD card from the local store and the other is bit older (originally for a phone), but both are Class 10. I try the configuration you recommended later today. Thanks for your answer.

Hello, sorry but my english is not best. I tried to search forum for these problems, but I do not found the answers First problem is that serial console do not work for me, just random symbols, I already tried 3 USB to RS converters with 3.3 V logic, hercules_3-2-8 and putty as SW, with multiple setting, mostly 115200, 8 data bits, no handshake, no parity. Second problem the HDMI do not show useful data either, at least for me there was nothing I can understand as problem. I have 2 orange Pi lite available, so it is probably not a board problem, I tried 2 SD cards and multiple images (desktop legacy kernel 3.4.y and mainline kernel 4.14.y from https://www.armbian.com/orange-pi-lite/) I tried multiple power supplies. I record one try, can someone point me to what I can have wrong? Thanks in advance for your answers.