Diagnostic Led; Battery Status Lights - Dell Precision 7520 Owner's Manual

Diagnostic LED

This section details the diagnostic features of the battery LED in a notebook.
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 amber, 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
amber, 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 three 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 Notebooks, battery codes for Low Battery or Battery Failure situations will not be displayed when Diagnostic
Error Codes are being displayed:
Table 3. LED pattern
Blinking pattern Problem Description
Amber White
2 1 processor
2 2 system board, BIOS ROM
2 3 memory
2 4 memory
2 5 memory
2 6 system board; chipset
2 7 display
3 1 RTC power failure
3 2 PCI/Video
3 3 BIOS recovery 1
3 4 BIOS recovery 2

Battery status lights

If the computer is connected to an electrical outlet, the battery light operates as follows:
Alternately blinking An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop. Re-plug battery connector,
amber light and replace battery if the issue reoccurs.
white light
Alternately blinking Temporary battery failure with AC adapter present. Re-plug battery connector, replace battery if the issue
amber light with reoccurs.
steady white light
Constantly blinking Fatal battery failure with AC adapter present. Fetal battery, replace the battery.
amber light
Light off Battery in full charge mode with AC adapter present.
White light on Battery in charge mode with AC adapter present.
84 Troubleshooting
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 nor found
recovery image found but invalid