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[Detachable Control Panel].. Which is your face plate.. I take your having trouble , remove all disk USB mpe attacehed remove face plate you will see a little hole you will need like a paper clip to push the button for about 2 seconds to reset the unit. after resettting attach face plate and try unit.
Sony car radio cdxgt540ui buttons non responsive - remove four screws on reverse side of faceplate, pry open with fingernails starting at the top right or left corner of the face plate once opened remove board on the reverse side of the LCD there are small brackets holding the LCD use a needle nose to pry each bracket in straight position then remove LCD for ten seconds then place back on to board and been brackets back in place. After these steps the front buttons should work again this process worked for me.
try taking an eraser and cleaning contacts on both head unit and face plate also check both constant and accesory fuses if you havent allready if thats not the case you may find that its cheaper to buy a new head unit than to replace face
remove the face, and at the bottom left hand corner of the unit in the dashboard, there is a very small reset pin-head button, press this with a pen, or similar pointed object....that should reset the whole unit
In the top right corner of the display is a small button that you push in and the face will drop down, this is for putting a cd into the unit and also for taking the face off. Once the face has dropped down you just pull it off. It will come right out. To put it back on again just place it back into the holder with the right side going in first and push it until it clicks into place. It doesn't take a lot of force to put it on or to take it off. If you are still having problems with it you may need to take it in for repair. But usually if the face is having problems with how it is attached, the problem is that the face will not stay on.
turn it off press the time display button located in top left corner then time will display,then pres and hold top right corner button until 12:00 flashes first the 12 will use your channel buttons on right side to scroll up the the time then when you get the correct time set press the clock display button again in top left corner of face plate!merry christmas!!!
i also have had this unit for over four years. the exact same thing just happened to me yesterday. i was thinking maybe it is the motor that opens the face. has anyone found an exact solution for this problem yet?