Dell Latitude 5300 2-in-1 Chromebook Enterprise Latitude 5300 2-in-1 Chrome Se - Page 109

Diagnostic LEDs, M-BIST

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3. Ensure that the LCD (screen) is clean (no dust particles on the surface of the screen). 4. Press and hold D key and Power on the laptop to enter LCD built-in self test (BIST) mode. Continue to hold the D key, until you see color bars on the LCD (screen). 5. The screen will display multiple color bars and change colors on the entire screen to red, green, and blue. 6. Carefully inspect the screen for abnormalities. 7. Press Esc key to exit. NOTE: Dell SupportAssist Pre-boot diagnostics upon launch, initiates an LCD BIST first, expecting a user intervention confirm functionality of the LCD. Diagnostic LEDs Instead of beep codes, errors are indicated via the bicolor Battery Charge/Status LED. A specific blink pattern is followed by flashing a pattern of flashes in amber, followed by white. The pattern then repeats. The diagnostic pattern will consist of a two-digit number being represented by a first group of LED blinks (1 through 9) in amber, followed by a 1.5 second pause with the LED off, and then a second group of LED blinks (1 through 9) in white. This is then followed by a three second pause, with the LED off, before repeating over again. Each LED blink takes 1.5 seconds. The system will not shutdown when displaying the Diagnostic Error Codes. Diagnostic Error Codes will always supersede any other use of the LED. For instance, on laptops, battery codes for Low Battery or Battery Failure situations will not be displayed when Diagnostic Error Codes are being displayed. Table 13. Diagnostic LEDs Blinking Pattern Problem Description Amber White 2 1 CPU failure Suggested Resolution Replace the system board. 2 2 System board failure (included BIOS corruption or ROM error) Flash latest BIOS version. If problem persists, replace the system board. 2 3 No memory/RAM detected Confirm that the memory module is installed properly. If problem persists, replace the memory module. 2 4 Memory/RAM failure Replace the memory module. 2 5 Invalid memory installed Replace the memory module. 2 6 System board/Chipset error Replace the system board. 2 7 LCD failure Replace the LCD module. 2 8 LCD Power rail failure Replace the system board. 3 1 CMOS battery failure Replace the RTS battery. 3 2 PCI or Video card/chip failure Replace the system board. 3 3 BIOS Recovery Image not found Flash latest BIOS version. If problem persists, replace the system board. 3 4 BIOS Recovery Image found but invalid Flash latest BIOS version. If problem persists, replace the system board. For diagnostics pattern 2-amber, 8-white connect an external monitor to isolate between system board or graphics controller failure. M-BIST M-BIST (Built In Self-Test) diagnostics tool, featuring improved accuracy in system board failures. NOTE: M-BIST can be manually initiated before POST (Power On Self Test). Troubleshooting 109

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3.
Ensure that the LCD (screen) is clean (no dust particles on the surface of the screen).
4.
Press and hold
D
key and
Power on
the laptop to enter LCD built-in self test (BIST) mode. Continue to hold the D key, until you see
color bars on the LCD (screen).
5.
The screen will display multiple color bars and change colors on the entire screen to red, green, and blue.
6.
Carefully inspect the screen for abnormalities.
7.
Press
Esc
key to exit.
NOTE:
Dell SupportAssist Pre-boot diagnostics upon launch, initiates an LCD BIST first, expecting a user intervention
confirm functionality of the LCD.
Diagnostic LEDs
Instead of beep codes, errors are indicated via the bicolor Battery Charge/Status LED. A specific blink pattern is followed by flashing a
pattern of flashes in amber, followed by white. The pattern then repeats.
The diagnostic pattern will consist of a two-digit number being represented by a first group of LED blinks (1 through 9) in amber, followed
by a 1.5 second pause with the LED off, and then a second group of LED blinks (1 through 9) in white. This is then followed by a three
second pause, with the LED off, before repeating over again. Each LED blink takes 1.5 seconds.
The system will not shutdown when displaying the Diagnostic Error Codes.
Diagnostic Error Codes will always supersede any other use of the LED. For instance, on laptops, battery codes for Low Battery or Battery
Failure situations will not be displayed when Diagnostic Error Codes are being displayed.
Table 13. Diagnostic LEDs
Blinking
Pattern
Problem Description
Suggested Resolution
Amber
White
2
1
CPU failure
Replace the system board.
2
2
System board failure (included BIOS corruption or ROM error)
Flash latest BIOS version. If problem persists,
replace the system board.
2
3
No memory/RAM detected
Confirm that the memory module is installed
properly. If problem persists, replace the
memory module.
2
4
Memory/RAM failure
Replace the memory module.
2
5
Invalid memory installed
Replace the memory module.
2
6
System board/Chipset error
Replace the system board.
2
7
LCD failure
Replace the LCD module.
2
8
LCD Power rail failure
Replace the system board.
3
1
CMOS battery failure
Replace the RTS battery.
3
2
PCI or Video card/chip failure
Replace the system board.
3
3
BIOS Recovery Image not found
Flash latest BIOS version. If problem persists,
replace the system board.
3
4
BIOS Recovery Image found but invalid
Flash latest BIOS version. If problem persists,
replace the system board.
For diagnostics pattern 2-amber, 8-white connect an external monitor to isolate between system board or graphics controller failure.
M-BIST
M-BIST (Built In Self-Test) diagnostics tool, featuring improved accuracy in system board failures.
NOTE:
M-BIST can be manually initiated before POST (Power On Self Test).
Troubleshooting
109