This section lists the system-diagnostic lights of your
Inspiron 15 3520.
Table 1. System-diagnostic lightsThe following table provides the system-diagnostic lights of your
Inspiron 15 3520.
Blinking pattern
Problem description
Suggested resolution
Amber
White
2
1
CPU failure
Run the Dell Support Assist/Dell Diagnostics tool.
If the problem persists, replace the system board.
2
2
System board failure (included BIOS corruption or ROM error)
Flash latest BIOS version
If the problem persists, replace the system board.
2
3
No memory/RAM detected
Confirm that the memory module is installed properly.
If the problem persists, replace the memory module.
2
4
Memory/RAM failure
Reset and swap memory modules among the slots.
If the problem persists, replace the memory module.
2
5
Invalid memory installed
Reset and swap memory modules among the slots.
If the 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
2
PCI or Video card/chip failure
Replace the system board.
3
3
BIOS Recovery image not found
Flash latest BIOS version
If the problem persists, replace the system board.
3
4
BIOS Recovery image found but invalid
Flash latest BIOS version
If the 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 the 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 the 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.
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