HOW TO ENTER SERVICE MODE TO SAMSUNG [CS-721 _ CS-723 & SCT-52A]

To enter service mode to these sets:

Press [PICTURE OFF => SLEEP => P.STD => MUTE => POWER ON]

To call an item to adjust, press CH+ & CH--ve buttons on the remote control
To adjust the data value to selected item, press Vol+ & Vol--ve buttons on the remote control

To exit from service mode, press 'Power" button