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Latitude 3520 Service Manual

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System-diagnostic lights

Table 1. System-diagnostic lightsThe following table provides the system-diagnostic lights:
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 and holding down power button for 3~5 seconds.
2 1 CPU failure
  • Run the Dell Support Assist/Dell Diagnostics tool.
  • 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 among the slots.
  • If problem persists, replace the memory module.
2 5 Invalid memory installed
  • Reset and swap memory modules among 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 main battery connection.
  • If problem persists, replace the main 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.
  • Press power button for over 25 seconds to do RTC reset. If problem persists, replace the system board.
  • Disconnect all power source (AC, battery, coin cell) and drain flea power by pressing and holding down power button 3~5 seconds to ensure all power are drained.
  • Run "BIOS recovery from USB", and the instructions are in the website Dell support.
  • If problem persists, replace the system board.
3 7 Timeout waiting on ME to reply to HECI message.

Replace the system board.

NOTE:Blinking 3-3-3 LEDs on Lock LED (Caps-Lock or Nums-Lock), Power button LED (without Fingerprint reader), and Diagnostic LED indicates failure to provide input during LCD panel test on Dell SupportAssist Pre-boot System Performance Check diagnostics.

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