System Diagnostic Lights - Dell Latitude 5520 Service Manual

System diagnostic lights

Battery-status light
Indicates the power and battery-charge status.
Solid white — Power adapter is connected and the battery has more than 5 percent charge.
Amber — Computer is running on battery and the battery has less than 5 percent charge.
Off
● Power adapter is connected and the battery is fully charged.
● Computer is running on battery and the battery has more than 5 percent charge.
● Computer is in sleep state, hibernation, or turned off.
The power and battery-status light blinks amber along with beep codes indicating failures.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times
followed by a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.
The following table shows different power and battery-status light patterns and associated problems.
Blinking Pattern
1
1
1
1
2
2
2
2
2
2
2
2
3
1
2
5
6
1
2
3
4
5
6
7
8
1
Problem description
TPM detection failure
Unrecoverable SPI flash
failure
EC unable to program i-Fuse
Generic catch-all for
ungraceful EC code flow
errors
CPU failure
System Board failure
(included BIOS corruption or
ROM error)
No Memory / RAM detected
Memory / RAM failure
Invalid memory installed
System board / Chipset Error
LCD failure (SBIOS message)
LCD failure (EC detection of
power rail failure)
CMOS battery failure
Suggested resolution
Replace the system board.
Replace the system board.
Replace the system board.
Disconnect all power source
(AC, battery, coin cell) and
drain flea power by pressing &
holding down power button.
Run the Intel CPU diagnostics
tools. If problem persists,
replace the system board.
Flash latest BIOS version. If
problem persists, replace the
system board.
Confirm that the memory
module is installed properly. If
problem persists, replace the
memory module.
Reset and swap memory
modules amongst the slots. If
problem persists, replace the
memory module.
Reset and swap memory
modules amongst the slots. If
problem persists, replace the
memory module.
Replace the system board.
Replace the LCD module.
Replace the system board.
Reset the CMOS battery
connection. If problem
persists, replace the RTC
battery.
Troubleshooting 115