Panasonic cq va707weuc display unit. I just replaced my old one because it would not extend or retract. After installing the new one and using it once it will not extend now. Help?

Simply using the [OPEN/CLOSE] button at the top of the display will cause the LCD monitor to retract.

The antenna generally will not retract until the power is turned off at the deck or if you turn the key off (which turns the deck off).Your deck may have a selectable dimmer function in the settings menu you should be able to set it to automatic and it will handle the dimming on its own then.

The " Blue & red spotted " wire that is spare from the rear of the radio transpires to come from the " cold " side of the radio's on / off switch , and serves to be only energized when the radio is switched-on and slowly shuts down on supply voltage when the radio is switched off , thus giveing a supply voltage for the relay & switch over reed switches in the aerial / antenna motor unit for a short run-down-time , to change over and allow the aerial mast to retract , in readyness for when the radio is switched on again and the aerial/antenna mast will power up .
This trigger / sender wire is connected via a 2 amp. fuse through to the aerial / antenna power relay.
The main aerial power motor unit is fed via a 6 amp. fuse.

bought car yesterday they changed the battery and now there is a code display that has the unit locked up

I have the brain unit I can sell you for $100 plus the main unit also I purchased the car and do not have the code to use the radio so I have the brain and the radio it will cost me $75 dollars to get the code from panasonic and I rather buy a new radion !!!!
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Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
Good Luck!

you hold the next track button 15sec at the code screen

TRY 0000 OR RESET THE UNIT

You may have one of this two problems:
One of the speaker wires is grounded to the chassis.
Or your car may have a factory amplifier between the radio and the speakers.
My suggestion is to rewire the speakers lines