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Dell Latitude 3400 Service Manual

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Diagnostic LED

This section details the diagnostic features of the battery LED.

Instead of beep codes, errors are indicated through the bicolor Battery Charge/Status LED. A specific blink pattern is followed by flashing a pattern of flashes in amber, followed by white. The pattern then repeats.
NOTE: The diagnostic pattern consists of a two-digit number being represented by a first group of LED blinks (1–9) in amber, followed by a 1.5 s pause with the LED off, and then a second group of LED blinks (1–9) in white. This is then followed by a three second pause, with the LED off, before repeating over again. Each LED blink takes 0.5 s.
The system will not shut down when displaying the Diagnostic Error Codes.

Diagnostic Error Codes always supersede any other use of the LED. For instance, on Notebooks, battery codes for Low Battery or Battery Failure situations will not be displayed when Diagnostic Error Codes are being displayed.

Table 1. Diagnostic LEDDiagnostic LED
Blinking Pattern Possible Problem Suggested Resolution
Amber White
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/Clock failure/Gate A20 failure/Super I/O failure/Keyboard controller failure Replace the system board.
2 7 LCD communication failure Replace the LVDS (Low-Voltage Differential Signaling) component.
2 8 No power supply to the LCD due to LCD power rail failure Replace the system board.
3 1 RTC power failure Replace the CMOS 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 EC ran into power sequencing failure. Flash latest BIOS version. If problem persists, replace the system board.
3 6 Flash corruption detected by SBIOS Flash latest BIOS version. If problem persists, replace the system board.
3 7 Timeout waiting on ME to reply to HECI message Flash latest BIOS version. If problem persists, replace the system board.

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