Battery Status Lights; Diagnostic Led - Dell Latitude 7424 Rugged Extreme Service Manual

Battery Status Lights

If the computer is connected to an electrical outlet, the battery light operates as follows:
Alternately An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop.
blinking amber
light and green
light
Alternately Temporary battery failure with AC adapter present.
blinking amber
light with steady
green light
Constantly Fatal battery failure with AC adapter present.
blinking amber
light
Light off Battery in full charge mode with AC adapter present.
green light on Battery in charge mode with AC adapter present.

Diagnostic LED

This section details the diagnostic features of the battery LED in a laptop.
Instead of beep codes errors are indicated via the bicolor Battery Charge LED. A specific blink pattern is followed by flashing a
pattern of flashes in green, followed by white. The pattern then repeats.
NOTE: The diagnostic pattern will consist of a two digit number being represented by a first group of LED blinks (1 through
9) in green, followed by a 1.5 second pause with the LED off, and then a second group of LED blinks (1 through 9) in white.
This is then followed by a 3 second pause, with the LED off, before repeating over again. Each LED blink takes 0.5 seconds.
The system will not shutdown when displaying the Diagnostic Error Codes. Diagnostic Error Codes will always supersede any
other use of the LED. For instance, on laptops, battery codes for Low Battery or Battery Failure situations will not be displayed
when Diagnostic Error Codes are being displayed:
Table 25. LED pattern
Blinking pattern
Green
2
2
2
2
2
2
2
3
3
3
White
1
2
3
4
5
6
7
1
2
3
Problem Description
processor
system board, BIOS ROM
memory
memory
memory
system board; chipset
display
RTC power failure
PCI/Video
BIOS recovery 1
Suggested Resolution
Processor failure
System board, covers
BIOS corruption or ROM
error
No memory/no RAM
detected
Memory failure/RAM
failure
Invalid memory installed
System board/ chipset
error
Display failure
Coin-cell battery failure
PCI/Video card/chip
failure
Recovery image not found
Diagnostics 151