Dell Inspiron 5720, Owner'S Manual, Page: 105 / 113

• Off – Camera is not in use.
Dell Enhanced Pre-Boot System Assessment (ePSA)
diagnostic 3.0
For more details, see Dell EPSA Diagnostic 3.0 .
LCD built in self test (BIST)
All-in-One (AIO) system supports LCD BIST similar to any other Dell systems that have BIST test implemented. It allows the user to isolate
the LCD during troubleshooting to determine which sub-system is at fault. The main difference is the lack of an integrated keyboard scan
controller in the AIO. When BIST is initiated, an internal generated pattern from the LCD is emitted for user's observation. This pattern goes
by sequence through this pattern. Black-White-Red-Green-Blue or a White-Black-Red-Green-Blue where each pattern is emitted for 2-3
seconds. The following images display the pattern of the colors on the LCD:
Troubleshooting 105