Separating the display from the MacBook Air
How possible would it be to split Macbook Air 11" (mid 2012) into 2 parts, a display placed away from the rest of the computer -- like in the car -- and just have a cable running between the 2, like 6 feet or less apart.
This is more of a modification Question than a DIY repair, but IMHo it would be very difficult - you'd need to create male/female connectors for the display data cable, and relocate the wireless antennas if you intend to use them.
You'd also need to consider RF interference along the cables, so the type of cable would be important. I do no know of any existing "extension" or cable.
Would you be able to use a 12volt (monitor) and the Thunderbolt or HDMI connector/cable
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If you only need to use the monitor and you are not interested in the rf antennas and iSight you could increase the lenght of LVDS cable.
This LCD should use (correct me if I am wrong) an LVDS cable and if you obtain the pinout you could attach it to a minipc with a lvds interface or use a HDMI to LVDS converter, or simply (well not so simply ;) ) extend the lenght of the original cable and use the macbook as the multimedia PC.
About the maximum lenght I don't know however there is a paper of TI which analyzed the standard using different cables and lenghts: