My Samsung j7 after repairing the LCD is asking for an encryption code

Either it’s an android pattern lock or pin you enter usually most people have it the same as the screen lock code.

If you don’t remember it the phone needs to be reset in recovery resulting in all data lost on the phone.

You can go into the recovery mode by first removing battery to turn off. After a few seconds reinsert battery. Then hold power + vol up + home until you see the light blue text booting recovery at the top left of screen release all keys.

Wait for recovery menu to show up use vol up and down to navigate menu. Power to select a highlighted option. Choose wipe data / factory reset. Then reboot phone afterwards.

Wait for phone to boot note that you may need google and samsung account details after doing a factory reset.