Samsung HLN507W1X/XAA Service Manual page 56

Alignment and Adjustments
1-19 LED Display Check
The three lights on the side panel indicate the status of your TV
Indicator Light Key
: Light is On
: Light is Blinking
: Light is Off
• It takes about 30 seconds for the TV to warm up, so normal brightness may not appear immediately.
• The TV has a fan to keep the inside lamp from overheating. You'll occasionally hear it working.
1-54 Samsung Electronics