To enter the service menu follow this procedure:

1. Put the set in cable mode if it is not already there.
2. Set the sleep timer for 30 minutes or longer.
3. Tune to channel 124.
4. On the set (not the remote) hold the volume down button until a red "check" appears on the upper left corner of the screen.
5. Then toggle through the various modes using the remote's power button, adjust up/down, volume up/down for parameter change.

Make sure to write down the numbers before any changes are made in case you get it messed up worse.

To exit the service menu, hold the "action" and "power" button on the set together until it resets and a self-check screen appears.

Hope that helps,

-Ken-