Celestial Television 21B33. Service Menu
Decrease volume to no sound, press and hold mute on remote control.
Press Menu key on TV panel until menu and D sign appears.
Use colured key to select and store settings.
All brand TV service mode, service menu or factory setting
All brand TV service mode, service menu or factory setting
All brand TV service mode, service menu or factory setting
All brand TV service mode, service menu or factory setting
All brand TV service mode, service menu or factory setting
All brand TV service mode, service menu or factory setting