Another partial victory. I re-connected my ODROID, added a USB WiFi
(the TP-Link TK-WN725N) so now there is working NTP, git and system
updates (www/gopher/e-mail, too).
I have had to rotate the LCD to landscape, which is not ideal. But now
the LCD image is green! I have to investigate if the problem is caused
by DVI-HDMI adapter or the cable (or software issue). The LCD itself
should be OK because service menus work normally.
Oh, I initially thought than it should be an easy process...