HI there..
Ok.. been playing around for a bit lately with some 4.3" and 5.0" CN GPS units.. Video Quality is OK, but Not great as the LCD screens in the GPS unit are normally pretty cheap with Tight viewing angles, Low bit converters etc.
Anyways, AV IN Details for Most units I've played with is as Follows:
The Plug is a Standard 2.5mm 4 segment: probably source a molded one from ebay/ phone shop /ipod etc.. chop the lead, splice to camera cabling etc..
Connections are:
1 - Right Audio In (RED)
2 - Left Audio In (WHITE or BLACK)
3 - Video In (YELLOW)
4 - Common Ground for ALL Input Lines
If the above Pin-out Doesn't work, Try connecting the Camera Output (or any Video Source really) to either pins 1,2 or 3 till it switches and You can See Video on the GPS LCD..
From 30 years of playing with AV stuff, You shouldn't really damage anything with a few seconds of Quick connection to confirm or deny you've got the right Pin ( or segment) on the 2.5mm plug.
Once the Unit Has a Video Signal connected to it ( and normally, no matter what is application or s/w is running on the GPS unit, ie. Nav, Games, Apps, the Win CE desktop, whatever...), It will switch to AV In Mode.. You'll get Video and Audio.. If the unit has a Thumb-wheel style Volume control on it use that to control Volume, If not, the Audio will eithr path thro at 100% volume or Maybe determined by current volume setting in s/w running, or Win CE Sound settings..
Finally, Obviously the Audio will sound pretty crappy and the L+R Channel are mixed as the unit only have One speaker internally, but "should" send L+R to the Earphone Jack (3.5mm) Audio Output.. most schematics I've seen feed the Stereo Audio thro to the Audio Output jack, via some amplification circuitry obviously..
Good Luck..
Hope this helps you out..
GPSMAD.
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