Dell Precision 7720 - Battery Status Lights; Real Time Clock Reset

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 19. LED pattern
Blinking pattern Problem Description Suggested Resolution
Ambe
r
White
2 1 processor processor failure
2 2 system board, BIOS ROM system board, covers BIOS corruption or ROM error
2 3 memory no memory/no RAM detected
2 4 memory memory failure/RAM failure
2 5 memory invalid memory installed
2 6 system board; chipset system board/ chipset error
2 7 display display failure
3 1 RTC power failure coin-cell battery failure
3 2 PCI/Video PCI/Video card/chip failure
3 3 BIOS recovery 1 recovery image nor found
3 4 BIOS recovery 2 recovery image found but invalid
Battery status lights
If the computer is connected to an electrical outlet, the battery light operates as follows:
Alternately
blinking amber
light and white
light
An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop. Re-plug battery connector,
replace battery if the issue reoccurs.
Alternately
blinking amber
light with steady
white light
Temporary battery failure with AC adapter present. Re-plug battery connector, replace battery if the issue
reoccurs.
Constantly
blinking amber
light
Fatal battery failure with AC adapter present. Fetal battery, replace the battery.
Light off Battery in full charge mode with AC adapter present.
White light on Battery in charge mode with AC adapter present.
Real Time Clock reset
The Real Time Clock (RTC) reset function allows you to recover your Dell system from No POST/No Boot/No Power situations. To
initiate the RTC reset on the system make sure system is in a power-off state and is connected to power source . Press and hold the
power button for 25 seconds and then release the power button. Go to how to reset real time clock.
NOTE:
If AC power is disconnected from the system during the process or the power button is held longer than 40
seconds, the RTC reset process is aborted.
The RTC reset will reset the BIOS to Defaults, un-provision Intel vPro and reset the system date and time. The following items are
unaffected by the RTC reset:
• Service Tag
• Asset Tag
• Ownership Tag
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Troubleshooting