Nav screen useless by itself?
I'm thinking about buying just the NAV screen and hook it up to some sort of video feed (camera, DVD....). Can the NAV screen be used like a monitor or does it absolutely need the NAV computer (or some sort of video module) to display anything on the screen?
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You need the video module.
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In theory, you can directly push video into it if you have a pc capable of some strange frequencies - think Linux, XFree special config files, and probably some specific graphics card.
Getting the TV module means that you get simpler TV inputs through it and then it's easier to connect PC, DVD players, cameras, etc into the TV module. TV and NAV can be together or either one alone. Both are capable of displaying the menus into the LCD (e.g. with NAV and TV, the tv displays the menus instead of nav). Then there is an additional issue with the screen, which is how to open it up. I'm hunting down the I-BUS to see it the screen opens up via I-bus, via K-BUS, or via power. Check this thread. |
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Check this guy out!
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The guy that sells BMW Navi parts is in Vilnius, Lithuania (I've been there, people are very nice!) and has great feedback on other BMW boards. I bought a 16:9 monitor from him for $712 and it is just like new - I can't tell that it's ever been used. Put him on eBay watch, he sends out emails with new goodies. That's how I nailed mine! Saskya is a good guy. :thumbup: |
I've been sniffing the bus and I have bad news. The codes below are listened when the open and close buttons are pressed, but when I inject the codes back into the bus, nothing happens to the screen - doesn't close/open, nor navi turn off or on.
46 xx 3b 48 39 xx (Unknown -> Navi/tv; open button press) 46 xx 3b 48 b9 xx (Unknown -> Navi/tv; open button release) 46 xx ff d5 01 00 xx (Unknown -> Broadcast) 46 xx 3b 48 38 xx (Unknown -> Navi/tv; open close press) 46 xx 3b 48 b8 xx (Unknown -> Navi/tv; open close release) 46 xx ff d5 01 01 xx (Unknown -> Broadcast) Who is 46? The infamous "LCD controller" that you'll need to power the screen motors??? PS: does anyone have any info about the LCM (light control module) ? around 90% of the traffic comes or goes to it, and it doesn't seem to only be the light sensors. |
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Please note that both the navi and the tv module are able to generate the menus on the screen, but when both modules exist, the tv overrides the navi: - with navi: navi R+G+B connect to screen R+G+B - with TV: tv R+G+B (same pins) connect to screen - with navi and tv: navi R+G+B aren't used, and an alternative set of pins, plus another pin called "navi sync" connect to the TV's second connector. Thus the TV generates the menu structure, and whenever the navi has a map to show, it sends a "please let my screen signal pass through" to the tv. Back to the ebay module, it looks like a simple composite tv (RCA, whatever) to screen resolution adaptor. It would pass the input video signal into the screen, but won't provide any menu like the original. |
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Yes, it does have the composite to BMW conversion, and I suspect that it emulates a TV module to the nav computer. However, when the TV module and nav computer are connected in tandem, the TV acts as a slave and expects the nav to tell it when to turn on. Therefore, if you have no nave as the primary, I suspect that this video module does nothing, since it probably always assumes that it is the slave. This is all conjecture, since I have not seen one first hand. But it would be consistent with what I know of the nav and TV module behaviours. |
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Now, the video signals pass through the TV module when both are connected, but it is just a pass through. The actual signals come from the nav computer. And, the TV module just stays idle until told by the nav computer to turn on and steal the signal path. |
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