We have an issue with ADV 7513 transmitting DVI (TMDS) signals using non-standard long lines and connectors (38999 type).
The picture size is 1024x768 50-60 Hz so is not a high frequency and it works perfect with cheap standard DVI cables of 15 meters long.
The problem is that black color (0x000000) is being received as a bright green noise. But when we change all black colors (0x000000) to the darkest grey (0x010101) the problem is gone and the picture looks okay.
Is there TMDS DC balancing mode implemented in ADV 7513? And is the specific configuration required to turn this mode on?
[edited by: ekondratiev at 10:38 AM (GMT -5) on 29 Jan 2021]