Samsung LH015I SERIES Installation Manual page 27

2. How to install
2-3 Physical Installation: Check the SET Condition
Power Switch
Power Inlet
Source Button
Connect Power Cable to SET
Use internal pattern to check dead pixel or any damage with screen
* Internal white pattern :
- Turn on Power
- Push Source button 5 seconds and release,
- Wait for display, push one more times. (color rotation : W -> R-> G -> B)
Samsung Electronics LED Display Installation