DS8000 Service Documentation Version 7.5

ThinkPad T540 laptop LED indicators

This section contains information about LEDs that are on the T540 laptops. This information is also in the Hardware Maintenance Manual ThinkPad® ThinkPad T540p and W540, which is included on the service documentation CD that is part of the ship group. The CD should be stored in the document box at the front upper left corner of Rack-1. Although the condition of LEDs might indicate a failure, the LEDs should not be used as a starting point for a repair.

Status indicators

The system status indicators, shown in Figure 1, show the status of the computer. Table 1 lists the definitions of the status indicators.
Figure 1. ThinkPad T540 laptop status indicators
ThinkPad T540 laptop status indicators
Table 1. Status indicators
Status indicator Definition
Callout label 1 Fn Lock indicator
Off (default mode):
The Fn Lock function is disabled. To initiate the special function of each key, press the corresponding function key directly. To input F1- F12, press the Fn key and the corresponding function key.
On (legacy mode):
The Fn Lock function is enabled. To input F1- F12, press the corresponding function key directly. To initiate the special function of each key, press the Fn key and the corresponding function key.
Callout label 2 Speaker mute indicator

On: The speakers are muted.
Callout label 3 Microphone mute indicator

On: The microphones are muted.
Callout label 4Camera status indicator

On: The camera is in use.
Callout label 5 Callout label 6 System status indicator
Blinking three times:
The computer is initially connected to power.
On:
The computer is in use.
Off:
The computer is off or in hibernation mode.
Slow blinking:
The computer is in sleep mode.
Fast blinking:
The computer is entering hibernation mode.