CELESTIAL _ 21B33
- Decrease the volume to minimum [0].
- Press and Hold the "Mute" button on the remote control and 'Menu" button on the front panel of the TV set, until "D" is displayed on screen.
- Use colored keys to select and adjust items.
COMET _ PT92J
- Press both "Volume Dn" button on the TV panel, and 'Subpage' button on the remote control to enter service mode
- Use "Prog Up / Prog Dn" button to select an item to adjust.
- Use "Volume Up / Volume Dn" button to adjust the data value to selected item.
- Press "TV" button on the remote control to 'Save and Exit' service mode.