Real Time Clock Reset - Dell Latitude 7280 Owner's Manual

Table 12. System-diagnostic lights (continued)
Blinking pattern
Amber
3
3
3
3
3
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.

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
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
● Admin Password
● System Password
● HDD Password
● TPM on and Active
● Key Databases
● System Logs
The following items may or may not reset based on your custom BIOS setting selections:
74 Troubleshooting
White Problem description
3 BIOS Recovery image not
4 BIOS Recovery image found
5
6 Flash corruption detected by
7 Timeout waiting on ME to
reply to HECI message.
found
but invalid
Power rail failure
SBIOS.
how to reset real time
Suggested resolution
●
Flash latest BIOS version
●
If problem persists,
replace the system board.
● Flash latest BIOS version
● If problem persists,
replace the system board.
Replace the system board.
● Press power button for
over 25 seconds to do
RTC reset. If 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 problem persists,
replace the system board.
Replace the system board.
clock.