Car stereo will not power up manually

The configuration of a car stereo antenna depends on the type of antenna that you have in your vehicle. Here are the steps for configuring a few common types of car stereo antennas:

1. Manual Antenna:

• Locate the antenna mast and the antenna base.
• If the antenna mast is extended, pull it down until it clicks into place.
• If the antenna mast is retracted, turn the antenna base clockwise to extend it.
• Tighten the antenna base to secure it in place.

1. Power Antenna:

• Turn the car stereo on.
• If the power antenna is not already extended, press the "Power" button on the stereo or on the dashboard to extend it.
• If the power antenna does not extend, check the fuse and the wiring connections to make sure they are secure.

1. Amplified Antenna:

• Connect the antenna cable to the amplifier.
• Connect the amplifier to the power source and ground.
• Turn the amplifier on.
• If the antenna does not extend, check the fuse and the wiring connections to make sure they are secure.

It's important to note that these are general steps and the specific configuration for your car stereo antenna may differ. If you are unsure about how to configure your antenna, it is best to consult the owner's manual or a professional installer for assistance.

How to Program a JVC Car CD Player Manually

1. Press the "Power" button at the top left corner of the stereo to turn the unit on.
2. Press the "Color" button to change the color of the display. ...
3. Press the "Menu" button to switch to clock setting mode. ...
4. Press the "Menu" button to navigate to the tuner. ...
5. Press the "EQ" button to select the preset sound mode.

https://itstillruns.com/program-car-cd-player-manually-6371562.html

Car stereos need a contant 12v power supply to retain memory for tuning and audio settings. It will be the yellow wire on the power harness to the back of your head unit.

Its probably wired to constant power instead of switched (via ignition). Find the switched power leg either with a volt meter and swap the radio power wire. just make sure its not the memory wire. that one needs constant power.

see this technique and fix it. God bless you
Instructions

1. With the Unlock Code
   • 1 Locate the anti-theft/unlock code. Most cars have a special anti-theft radio card that is included with the owners manual packet containing the unlock code and serial number. Some cars also have the code in the car manual or inside the glove compartment. You will need this code in order to unlock your car radio.
     
   • 2 Turn the car's ignition switch to the "on" position. This turns on your car's electrical system and powers up the radio. The word "CODE" will display on the screen. Note: depending on the manufacturer some radios will display either "ENTER" or "LOC" on the screen instead.
     
   • 
     
     
   • 3 Enter the anti-theft/unlock radio code. Press the "Tune" button on your stereo. It will change the screen from "CODE" to blank. Press the button to scroll through the available numbers. When you reach the correct number press the button once and hold it down for a few seconds. The number will appear on the display and you can now repeat the process to input the second number, third number etc., until all of the numbers are in. If you entered the code correctly the car stereo will unlock and instantly become functional. Depending on your car manufacturer, if you enter the code incorrectly you will not be able to re-enter it again from 1 to 24 hours.
     
   Without the Unlock Code
   • 4 Call your car manufacturer directly. Your car manufacturer's phone number is in your owner's manual. Ask to be connected to the support department. Tell them you need to reactivate you car stereo and you will be asked for proof of ownership. They will need your car's VIN number, the account number from your bill of sale and a form of personally identifiable information like your driver's license. You may need to fax this information. Once everything checks out the manufacturer will give you the code.
     
   • 5 Enter the code and unlock your stereo. Use the code you received from the manufacturer to unlock and and activate your car stereo.
     
   • 6 Go to a car dealership. Take your car to its manufacturer dealership to get the stereo unlocked. For example, if your car is a Honda go to a Honda dealership. Once you have proven that you are the owner of the car, the dealership will be able to retrieve the code from the manufacturer and activate the radio for you.
     

change the tune mode to standby mode. Then press menu button for few second until clock word is displayed on the screen. Afterward, press the center of the main control button on the right side of the stereo system. The time is now blinking and you can start set the time by pressing upward & downward button for hour and left & right button for the minute

Sounds like the fuse for the switched power has blown. The stereo has two power inputs -- one unswitched, called "memory" because it lets the stereo remember your presets, and one switched, just called "power"

It should let you see the time, eject a CD, etc all when the car is turned off. Since the fuse for the main power line is blown, the stereo thinks the car is turned off all the time.

go to the panasonic website and get you manual and read it and it should get you system right again
its free

Here is how to manually tune your radio.
1 Press the SOURCE button until a radio
frequency appears in the display.
2 Press the BAND button repeatedly until the
desired radio band is displayed.
Each press changes the band:
→ F1(FM1) → F2(FM2) → AM
3 Press the TUNE button repeatedly until "DX
SEEK" and "SEEK" disappear from the display.
NOTE
The initial mode is DX SEEK.
4 Press the g DN or f UP button to move
downward or upward one step respectively until
the desired station frequency is displayed.
NOTE
The ST indicator or STEREO indicator appears on the
display when a Stereo FM station is tuned in


You can also look at your manual here for any other ? you might have
http://akamaipix.crutchfield.com/Manuals/500/500CDM7874.PDF

after the pin select press am or fm. dont turn on with the power button, coz you have todo it again, and make sure yuo have to put the right pin, you have i think 4 times todo that until it locked.