If your iPod won't connect to the Luna while docked, the dock may be faulty. Follow this guide to replace the dock circuit board.
Flip the device over so that the batteries are closest to you.
Remove the battery lid by pressing the battery cover's tab and pulling it away from the device.
Push the battery against the spring and lift it out of the casing.
Repeat with the other battery.
Unscrew all eight 12mm Phillips head screws with a Philips #1 screwdriver.
Flip the Luna back over so that the buttons are facing upward and the LCD screen is facing you.
Gently tilt the lid back 45 degrees so that the inside is exposed.
Unscrew the four black 7mm screws with the Phillips #1 screw driver that hold the middle circuit board to the top case.