Supportassist Diagnostics; Built-In Self-Test (Bist); Lcd Built-In Self Test (Bist) - Dell W29C Service Manual

Table 22. System diagnostic lights (continued)
Light pattern
2,7
2,8
3,1
3,2
3,3
3,4
3,5
3,6
3,7
4,1
4,2

SupportAssist diagnostics

About this task
The SupportAssist diagnostics (previously known as ePSA diagnostics) performs a complete check of your hardware. The
SupportAssist diagnostics is embedded in the BIOS and is launched by it internally. The SupportAssist diagnostics provides a set
of options for particular devices or device groups. It allows you to:
● Run tests automatically or in an interactive mode.
● Repeat tests
● Display or save test results
● Run thorough tests to introduce additional test options and provide extra information about the failed device(s)
● View status messages that indicate if the tests are completed successfully
● View error messages that indicate if problems were encountered during the test
NOTE: Some tests are meant for specific devices and require user interaction. Ensure that you are present in front of the
computer when the diagnostic tests are performed.
For more information, see

Built-in self-test (BIST)

LCD Built-in Self Test (BIST)

Dell All-in-One (AIO) have a built-in diagnostic tool that helps you determine if the screen abnormality you are experiencing is an
inherent problem with the LCD (screen) of the Dell AIO or with the video card (GPU) and PC settings.
When you notice screen abnormalities such as flickering, distortion, clarity issues, fuzzy or blurry image, horizontal or vertical
lines, color fade and so on, it is always a good practice to isolate the LCD (screen) by running the Built-In Self Test (BIST).
How to invoke LCD BIST Test
1. Power off the Dell AIO.
2. Ensure that the LCD screen is clean and there are no dust particles on the surface of the screen.
3. Press and hold Mode button and power on the AIO to enter LCD built-in self test (BIST) mode. Continue to hold the Mode
button, until the computer boots up.
The screen will display solid colors and change colors on the entire screen to white, black, red, green, and blue for 20
seconds.
84 Troubleshooting
Problem description
Display failure
LCD power rail failure
CMOS battery failure
PCIe or video card/chip failure
BIOS recovery image not found
BIOS recovery image found but invalid
Power rail failure
System BIOS Flash incomplete
Management Engine (ME) error
Memory DIMM power rail failure
CPU power cable connection issue
SupportAssist Pre-Boot System Performance Check.