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Dell Latitude 7480 Owner's Manual

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System diagnostic lights

Battery-status light

Indicates the power and battery-charge status.

Solid white — Power adapter is connected and the battery has more than 5 percent charge.

Amber — Computer is running on battery and the battery has less than 5 percent charge.

Off
  • Power adapter is connected and the battery is fully charged.
  • Computer is running on battery and the battery has more than 5 percent charge.
  • Computer is in sleep state, hibernation, or turned off.

The power and battery-status light blinks amber along with beep codes indicating failures.

For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.

The following table shows different power and battery-status light patterns and associated problems.

Blinking Pattern Problem description Suggested resolution
Amber White
1 1 TPM detection failure Replace the system board.
1 2 Unrecoverable SPI flash failure Replace the system board.
1 5 EC unable to program i-Fuse Replace the system board.
1 6 Generic catch-all for ungraceful EC code flow errors Disconnect all power source (AC, battery, coin cell) and drain flea power by pressing & holding down power button.
2 1 CPU failure Run the Intel CPU diagnostics tools. If problem persists, 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 Reset and swap memory modules amongst the slots. If problem persists, replace the memory module.
2 5 Invalid memory installed Reset and swap memory modules amongst the slots. If problem persists, replace the memory module.
2 6 System board / Chipset Error Replace the system board.
2 7 LCD failure (SBIOS message) Replace the LCD module.
2 8 LCD failure (EC detection of power rail failure) Replace the system board.
3 1 CMOS battery failure Reset the CMOS battery connection. If problem persists, replace the RTC 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.
3 5 Power rail failure Replace the system board.
3 6 Flash corruption detected by SBIOS. Replace the system board.
3 7 Timeout waiting on ME to reply to HECI message. Replace the system board.

Camera status light: Indicates whether the camera is in use.

  • Solid white — Camera is in use.
  • Off — Camera is not in use.

Caps Lock status light: Indicates whether Caps Lock is enabled or disabled.

  • Solid white — Caps Lock enabled.
  • Off — Caps Lock disabled.

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