Keypad test. Once each key is pressed 'OK' appears next to it.

Similar to keypad test. The small arrows appear for each trim button that is exercised.

I did not manage to get a response on this screen.
It may be a screen to tests the switches or change the switch type.

Some of the stars appear or disappear as the service menu enabler is removed/reinserted to the transmitter.
It is probably a test for Input/Output ports of the radio.

Another hardware test menu.

These are just horizontal and vertical lines scanning the display to show any dead pixels.