Dell Vostro 5515 Vostro 15 5515 Service Manual - Page 74

M-BIST, LCD Built-in Self Test (BIST), WiFi power cycle, How to run M-BIST

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9. Double-click the BIOS update file icon and follow the instructions on the screen. 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). How to run M-BIST NOTE: M-BIST must be initiated on the system from a power-off state either connected to AC power or with battery only. 1. Press and hold both the M key on the keyboard and the power button to initiate M-BIST. 2. With both the M key and the power button held down, the battery indicator LED may exhibit two states: a. OFF: No fault detected with the system board b. AMBER: Indicates a problem with the system board LCD Built-in Self Test (BIST) Dell laptops 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 laptop or with the video card (GPU) and PC settings. When you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry image, horizontal or vertical lines, color fade etc., 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 laptop. 2. Disconnect any peripherals that are connected to the laptop. Connect only the AC adapter (charger) to the laptop. 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. WiFi power cycle If your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be performed. The following procedure provides the instructions on how to conduct a WiFi power cycle: NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device. 1. Turn off your computer. 2. Turn off the modem. 3. Turn off the wireless router. 4. Wait for 30 seconds. 5. Turn on the wireless router. 6. Turn on the modem. 7. Turn on your computer. 74 Troubleshooting

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9.
Double-click the BIOS update file icon and follow the instructions on the screen.
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).
How to run M-BIST
NOTE:
M-BIST must be initiated on the system from a power-off state either connected to AC power or with battery only.
1.
Press and hold both the
M
key on the keyboard and the
power button
to initiate M-BIST.
2.
With both the
M
key and the
power button
held down, the battery indicator LED may exhibit two states:
a.
OFF: No fault detected with the system board
b.
AMBER: Indicates a problem with the system board
LCD Built-in Self Test (BIST)
Dell laptops 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 laptop or with the video card (GPU) and PC settings.
When you notice screen abnormalities like flickering, distortion, clarity issues, fuzzy or blurry image, horizontal or vertical lines,
color fade etc., 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 laptop.
2.
Disconnect any peripherals that are connected to the laptop. Connect only the AC adapter (charger) to the laptop.
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.
WiFi power cycle
If your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be
performed. The following procedure provides the instructions on how to conduct a WiFi power cycle:
NOTE:
Some ISPs (Internet Service Providers) provide a modem/router combo device.
1.
Turn off your computer.
2.
Turn off the modem.
3.
Turn off the wireless router.
4.
Wait for 30 seconds.
5.
Turn on the wireless router.
6.
Turn on the modem.
7.
Turn on your computer.
74
Troubleshooting