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Diagnostics
Dell™ Latitude™ E5400 Discrete Service Manual
Device Status Lights
Battery Status Lights
Battery Charge and Health
Keyboard Status Lights
LED Error Codes
Device Status Lights
Turns on when you turn on the computer and blinks when the computer is in a power management mode.
Turns on when the computer reads or writes data.
Turns on steadily or blinks to indicate battery charge status.
Turns on when wireless networking is enabled.
Turns on when a card with Bluetooth® wireless technology is enabled. To turn off only the Bluetooth
wireless technology function, right-click the icon in the system tray and select Disable Bluetooth Radio.
Battery Status Lights
If the computer is connected to an electrical outlet, the battery light operates as follows:
Alternately blinking amber light and blue light — An unauthenticated or unsupported, non-Dell AC adapter is attached to your laptop.
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Alternately blinking amber light with steady blue light — Temporary battery failure with AC adapter present.
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Constantly blinking amber light — Fatal battery failure with AC adapter present.
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Light off — Battery in full charge mode with AC adapter present.
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Blue light on — Battery in charge mode with AC adapter present.
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Battery Charge and Health
To check the battery charge, press and release the status button on the battery charge gauge to illuminate the charge-level lights. Each light represents
approximately 20 percent of the total battery charge. For example, if four lights are on, the battery has 80 percent of its charge remaining. If no lights appear,
the battery has no charge.
To check battery health using the charge gauge, press and hold the status button on the battery charge gauge for at least 3 seconds. If no lights appear, the
battery is in good condition and more than 80 percent of its original charge capacity remains. Each light represents incremental degradation. If five lights
appear, less than 60 percent of the charge capacity remains, and you should consider replacing the battery.
Keyboard Status Lights
The green lights located above the keyboard indicate the following:
Turns on when the numeric keypad is enabled.
Turns on when the Caps Lock function is enabled.
Turns on when the Scroll Lock function is enabled.
LED Error Codes
The following table shows the possible LED codes that may display in a no-POST situation.
Appearance
ON-FLASH-FLASH
FLASH-ON-ON
Description
1. Install supported memory modules.
2. If memory is already present, reseat the module(s) one at
3. Try known good memory from another computer or replace the
No SODIMMs are installed
4. Replace the system board.
1. Reseat the processor.
2. Replace the system board.
System board error
3. Replace the processor.
Next Step
time in each slot.
memory.
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