Dell Latitude 9440 2-in-1 Service Manual

Also see for Latitude 9440 2-in-1: Setup and specifications

Table 20. LED error codesBlinking Pattern Possible ProblemAmber White2 1 CPU Failure2 8 LCD Power Rail Failure1 1 TPM Detection Failure2 4 Memory/RAM failure4. If there is no failure with the system board, the LCD will cycle through the solid color screens described in the LCD-BISTsection for 30 seconds and then power off.LCD Power rail test (L-BIST)L-BIST is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST will checkthe LCD power rail. If there is no power being supplied to the LCD (that is if the L-BIST circuit fails), the battery status LED willflash either an error code [2,8] or an error code [2,7].NOTE: If L-BIST fails, LCD-BIST cannot function as no power will be supplied to the LCD.How to invoke L-BIST Test:1. Press the power button to start the system.2. If the system does not start up normally, look at the battery status LED:● If the battery status LED flashes an error code [2,7], the display cable may not be connected properly.● If the battery status LED flashes an error code [2,8], there is a failure on the LCD power rail of the system board, hencethere is no power supplied to the LCD.3. For cases, when a [2,7] error code is shown, check to see if the display cable is properly connected.4. For cases when a [2,8] error code is shown, replace 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 inherentproblem 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 Test1. 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, untilthe system boots up.5. The screen will display solid colors and change colors on the entire screen to white, black, red, green, and blue twice.6. Then it will display the colors white, black and red.7. Carefully inspect the screen for abnormalities (any lines, fuzzy color or distortion on the screen).8. At the end of the last solid color (red), the system will shut down.NOTE: Dell SupportAssist Pre-boot diagnostics upon launch, initiates an LCD BIST first, expecting a user interventionconfirm functionality of the LCD.76 Troubleshooting