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Service Tag
The service tag is a unique alphanumeric identifier that allows Dell service technicians to identify the hardware components in
your computer and access warranty information.
Battery charge and status light
The following table lists the battery charge and status light behavior of your Latitude 5540.
Table 1. Battery charge and status light behavior
Power Source
AC Adapter
AC Adapter
Battery
Battery
● S0 (ON) - System is turned on.
● S4 (Hibernate) - The system consumes the least power compared to all other sleep states. The system is almost at an OFF
state, expect for a trickle power. The context data is written to hard drive.
● S5 (OFF) - The system is in a shutdown state.
LED Behavior
Off
Solid White
Off
Solid Amber (590+/-3 nm)
System Power State
S0 - S5
S0 - S5
S0 - S5
S0 - S5
Battery Charge Level
Fully Charged
< Fully Charged
11-100%
< 10%
Views of Latitude 5540
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