Hello,
This forum is great with lots of very usefull informations, it's why I want to share my solution for my problem which was that my AUDI Q7 2006 nav unit MMI 2G was not able to read backup DVD but had no problem with the OEM dvd. I already had the same problem with my BMW 745I E65 2004 with MK4 DVD navigation GPS and solution was the same !
I was happy to see that DVD+RW, DVD+R verbatim and DVD-R EMTEC were perfectly working after repair :-)
Problem is the dvd optical laser lens, and I was lucky because the lens in both navigation unit are the same with reference SF-HD4 (50$ on aliexpress). I took the working lens from my BMW unit and installed it on the AUDI unit and backup DVD were working immediatly then LENS IS THE PROBLEM !
I tried to clean the AUDI lens with alcohol but no results but few years ago this method worked for my BMW lens.
Then in case of no backup reading, replace your lens :)
This forum is great with lots of very usefull informations, it's why I want to share my solution for my problem which was that my AUDI Q7 2006 nav unit MMI 2G was not able to read backup DVD but had no problem with the OEM dvd. I already had the same problem with my BMW 745I E65 2004 with MK4 DVD navigation GPS and solution was the same !
I was happy to see that DVD+RW, DVD+R verbatim and DVD-R EMTEC were perfectly working after repair :-)
Problem is the dvd optical laser lens, and I was lucky because the lens in both navigation unit are the same with reference SF-HD4 (50$ on aliexpress). I took the working lens from my BMW unit and installed it on the AUDI unit and backup DVD were working immediatly then LENS IS THE PROBLEM !
I tried to clean the AUDI lens with alcohol but no results but few years ago this method worked for my BMW lens.
Then in case of no backup reading, replace your lens :)