@MadScientist Ups! Well done replacement display arrived and works properly with my controller, so you were right - those 3 additional pins in lvds port are just ignored if no signal is provided. My big trouble is resolved, doing research for replacement of original AUO LCD I have found only one on the planet in the US, but the company sent me invoice for 4999 USD, imagine that?
During whole that journey, accidentally I discovered something you might be interested as well. Happily working with my very unique controller board (broadcast monitor made byMurray Pro - English company specialised in broadcasting devices) LCD replacement - LM240UW2 comes from 2007-2009 iMac 24 inch, which is very cheap nowadays (I have paid 20 pounds for it), but it’s really high quality 32bit 1920x1200 IPS display. And there’s available cheap (22 GBP) controller for this panel on Aliexpress: https://www.ebay.co.uk/itm/195143329095?ViewItem=&item=195143329095
I have ordered it as well as backup option if LM240UW2 fail to work with my controller, today tested and it’s brilliant couple. So for 40 pound plus 12V/24V power adapters it makes high quality monitor. So I bought another LM240UW2 LCD, this time with whole damaged iMac 24 with working LCD (damaged iMac’s are basically because of faulty PSU or logic board) and this is even better option than just LCD panel because iMac’s body can be used as really elegant enclosure for the monitor.
Just in case you or someone else be interested.
Once again - thank you for supporting me in that LVDS journey