Inspiron 15 3521 Service Manual

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System-diagnostic lights

This section lists the system-diagnostic lights of your Inspiron 15 3521.

Table 1. System-diagnostic lightsThe following table provides the system-diagnostic lights of your Inspiron 15 3521.
Blinking pattern		Problem description	Suggested resolution
Amber	White	Problem description	Suggested resolution
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 LCD module.
3	1	RTC power failure	Replace the 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	Flash latest BIOS version. If problem persists, replace the system board.
3	6	SBIOS flash corruption	Flash latest BIOS version. If problem persists, replace the system board.
3	7	ME error	Flash latest BIOS version. If problem persists, 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.