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hi, i bought <a href="http://www.12vcity.com/wholesale-car-electronics-car-dvd-2-din-car-dvd/13-car-double-din-dvd-player-buy-car-double-din-dvd-player-ma-dvd7004.html">12VCITY MA-7004</a> on 12VCITY official, i also changed the wire so as to watch car DVD, but everything turn out to be fine.I think maybe you have connect the wrong wire and have bum out the built in amp.
if im correct, you had/have steering wheel controls....correct. if im correct then you might have tapped into these wires. some of them will give a 12v reference, in actuality they are to give the factory radio an ohm reading telling it what to adjust. my best advice is to retrace all your install wires to confirm that they are all correct wires needed to connect to. then if not it will deffinately have to take a visit to the manufacturer, hope this helps!
Im guessing that if you can hear sound but have no picture and this is newly installed that your unit is wired to your parking brake as a safety feature. You need to disconnect it and connect the wire to the radio ground to bypass it.
Did you install it, they generally sense whether youre moving by having a connection to your handbrake, if this is not connected the unit thinks youre moving but usually gives an on screen message. To disable this you usually have to ground the brake sensor wire( connect it to the body of the vehicle) YOU TRY THIS AT YOUR OWN RISK!!!!!!!!!!!!!!!!!!!!!!!!!!
You probably have a connector up inside the housing that is loose. Or the dealer changed the radio out and did not wire up the sound. Either way the sound comes from a circuit board up in the DVD player itself. You need to unscrew it from the ceiling and look for wiring clues. May be as simple as plugging it into the appropriate connector.