All-in-One
(AIO) systems 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 will be emitted for user's observation. This pattern
will go by sequence through this pattern. Black-White-Red-Green-Blue
or a White-Black-Red-Green-Blue where each pattern is emitted for
2 to 3 seconds. The following images displays the pattern of the
colors on the LCD.
Invoking BIST with
user modes
There are two methods to invoke
the LCD BIST .
OSD Toggle
ePSA
OSD toggle
The
first method of user initiation is via OSD toggle button. The user
should press the OSD toggle button and hold it in while the power
button is applied to turn the AIO on. This is the hardware-initiated
method that does not require the CPU and BIOS to be functional. The
panel will stay in BIST mode until the BIOS reboots the system. The
test duration is approximately 20 seconds which allows 2 cycles of
color bar patterns.
To invoke the BIST test via OSD
Toggle:
Press and hold down the
OSD toggle button.
Press the power button
to turn on the computer while holding down on the OSD toggle button.
NOTE: The OSD
toggle is located at the right side of the chassis, just above the
Hard Disk indicator light.
ePSA
The second
method to troubleshoot is via ePSA entry. The user initiates a Pre-Boot
POST via F12 function key and the system enters ePSA. The ePSA menu
will have an LCD BIST selection that asserts the proper signals via
BIOS commands. The BIST mode will loop for approximately 20 seconds
giving 2 cycles of color bar patterns that the user can observe. The
time period is controlled by BIOS. After the time period, the BIOS
will return the system to the ePSA menu.
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