Diagnostic and Battery Indicators for Dell Latitude Laptops and Tablets

概要: This article provides Diagnostic and Battery Indicator information for Dell Latitude Notebooks and Tablets.

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This article provides information about the Diagnostic LED codes for Dell laptops and tablets. Find information about common troubleshooting steps, helpful links to battery, AC adapter, and other troubleshooting guides to resolve battery and AC adapter related issues.

Dell laptops have different types of onboard visual (LED) and audible (beep code) diagnostic indicators to help detect the symptoms of failed hardware components. Most of these symptoms are related to a failure to power on, complete power on self-test (POST), screen issue, or an issue with booting into the operating system. To learn more about how to troubleshoot such issues, see the Dell knowledge base article Resolve No Power, No Post, No Boot or No Video.

Choose a section below that relates to your computer model to view the information within.

Note: Some laptops use a sequence of audible beep codes to indicate a possible hardware component failure. See the Beep Codes table in the Dell Latitude section below for more information about how to use these codes to troubleshoot your computer.

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Dell Latitude E-series laptop battery

Figure 1: Battery Status:

Power or battery light - Turns white or amber to indicate the power status and remaining battery charge. See the tables below.

LED Light Description
1	Power Light
2	Hard drive light
3	Battery status light
4	Wi-Fi light

Battery light state

Battery State	LED Behavior	Next Steps
An unsupported or non-Dell AC adapter is attached to your laptop.	Alternately blinking amber light and white light	Disconnect and reconnect the AC adapter. Try with a known-good AC adapter. If a known-good AC adapter is working, contact Dell Technical Support for AC adapter replacement options.
Temporary battery failure with AC adapter present	Alternately blinking amber light with steady white light	Turn off the computer. Disconnect the AC adapter. Reseat the battery. For laptops with non-removable battery, go to the next step. Try with a known-good battery from another similar Dell laptop (if available). If the known-good battery works, contact Dell Technical Support for battery replacement options. See the Dell knowledge base article How to Troubleshoot Dell Laptop Battery Issues to troubleshoot the battery issue. For more info on battery warranty support, see the Dell knowledge base article Dell Laptop Battery Warranty Support.
Fatal battery failure with AC adapter present	Constantly blinking amber light	Turn off the computer. Disconnect the AC adapter. Reseat the battery. For laptops with non-removable battery, go to the next step. Try with a known-good battery from another similar Dell laptop (if available). If the known-good battery works, contact Dell Technical Support for battery replacement options. See the Dell knowledge base article How to Troubleshoot Dell Laptop Battery Issues to troubleshoot the battery issue. For more info on battery warranty support, see the Dell knowledge base article Dell Laptop Battery Warranty Support.
Battery in full charge mode with AC adapter present	Light off	No further actions are required.
Battery in charge mode with AC adapter present	White light on	No further actions are required.

Note: To learn more about laptop battery troubleshooting, see the Dell knowledge base article How to Troubleshoot Dell Laptop Battery Issues.

If the laptop is connected to an electrical outlet, the power or battery light operates as follows. For specific information about your Dell laptop, see the User Manual of your Dell laptop.

Power State	Charging status	LED Behavior
On	Any (0-100%)	Solid white
Standby	Any (0-100%)	Breathe white (slow increase and decrease in illumination).
Off, hibernate	>90% charge	Off
Off, hibernate	= 90% charge	Solid white

If the laptop is running on battery power, the power or battery light operates as follows. For specific information about your Dell laptop, see the User Manual of your Dell laptop.

Power State	Remaining battery power	LED Behavior
On	= 10% charge	Solid white
On	<10% charge	Solid amber
Standby	= 10% charge	Breathe white (slow increase and decrease in illumination).
Standby	<10% charge	Solid amber
Off, hibernate	Any (0-100%)	Off

Note: Helpful troubleshooting resources

Currently Shipping Models:

The three LED indicator lights are located near the front right-side of the computer, as shown below:

Figure 2: Diagnostic LED

The battery LEDs on these laptops blink in an amber or white pattern to indicate hardware component failures. Use the table below to determine what each LED flash sequence means.

Note: The first number in the LED Flash Sequence column represents the number of amber-colored flashes, while the second number represents the number of white-colored flashes.
Example: No Memory or RAM detected is (2,3): The battery LED blinks two times in amber, then three times in white.
The battery LED will stop blinking for 1.5 seconds between the amber and white flashes, and the sequence will repeat after a 3 second pause.

The following table depicts the amber and white blinking patterns with possible troubleshooting resolution:

LED Flash Sequence	Fault Description	Faults
2,1	CPU	Possible CPU Failure
2,2	Motherboard BIOS	Motherboard (Includes BIOS Corruption or ROM Error)
2,3	Memory	No memory or RAM detected
2,4	Memory	Memory or RAM failure
2,5	Memory	Invalid Memory Installed
2,6	Motherboard Chipset	Motherboard or Chipset Error
2,7	LCD	LCD Failure
3,1	RTC Power Failure	CMOS Battery Failure
3,2	PCI or Video	PCI or Video Card or Chip Failure
3,3	BIOS Recovery 1	Recovery Image Not Found
3,4	BIOS Recovery 2	Recovery Image Found But Invalid

Note: If the error code is not listed above, contact Dell Technical Support. To learn more about Dell ePSA diagnostics, see the Dell knowledge base article Resolve Hardware Issues using ePSA Diagnostics.

Legacy Models:

Figure 3: Led Light Descriptions

LED Light Description
1	Power Light
2	Hard drive light
3	Battery status light
4	Wi-Fi light

The table below shows how to read the LED codes on a Dell laptop when a possible error occurs:

Storage LED	Battery LED	Wireless LED	Fault Description	Next Steps
Blinking	Solid	Solid	A possible processor failure has occurred.	Contact Dell Support
Solid	Blinking	Solid	The memory modules are detected but has encountered an error.	See the Dell knowledge base article How to diagnose and resolve common memory issues on a Dell Computer.
Blinking	Blinking	Blinking	A system board failure has occurred.	Contact Dell Support
Blinking	Blinking	Solid	A possible graphics card or video failure has occurred.	See the Dell knowledge base article How to Troubleshoot Display or Video Issues on Dell Laptop LCD Panel.
Blinking	Blinking	Off	The computer failed during hard drive initialization or Option ROM initialization.	See the Dell knowledge base article How to resolve HDD (Hard drive) issues on a Dell Computer.
Blinking	Off	Blinking	The USB controller encountered a problem during initialization.	Check ports for damage and remove any USB devices. See the Dell knowledge base article Troubleshooting Ports on a Dell Computer.
Solid	Blinking	Blinking	No memory modules are installed or detected.	See the Dell knowledge base article How to diagnose and resolve common memory issues on a Dell Computer.
Blinking	Solid	Blinking	The LCD encountered a problem during initialization.	See the Dell knowledge base article How to Troubleshoot Display or Video Issues on Dell Laptop LCD Panel.
Off	Blinking	Blinking	The modem is preventing the computer from completing POST.	Try reseating or removing any Modem cards.
Off	Blinking	Off	The memory failed to initialize, or it is unsupported.	See the Dell knowledge base article How to diagnose and resolve common memory issues on a Dell Computer.

Note: Helpful troubleshooting resources

Dell Latitude D-series laptop battery

Battery Status

If the computer is connected to an AC adapter, the battery light operates as follows. For specific information about your Dell laptop, see the User Manual of your Dell laptop.

Solid Green - The battery is charging.
Flashing Green - The battery is almost fully charged.

If the computer is running on battery power, the battery light operates as follows. For specific information about your Dell laptop, see the User Manual of your Dell laptop.

Off - The battery is adequately charged (or the computer is turned off)
Flashing orange - The battery charge is low.
Solid orange - The battery charge is critically low.

Note: Helpful troubleshooting resources

Dell Latitude D-series Diagnostic LEDs

LED Error Codes

The following table shows the possible LED codes that may display in a no-POST situation:

Flash Code	Description	Next Step
Figure 4: Num Lock Flashing, Caps Lock On, Scroll Lock On	The microcontroller is handing control of the computer to the processor. This code persists if no processor is detected.	Reseat the processor. Replace the system board. Replace the processor.
Figure 5: Num Lock On, Caps Lock Flashing, Scroll Lock On	The memory has encountered an error.	Reseat the memory modules. Replace the memory modules. Replace the system board.
Figure 6: Num Lock Flashing, Caps Lock Flashing, Scroll Lock Flashing	A system board component is faulty.	Replace the system board.
Figure 7: Num Lock Flashing, Caps Lock Flashing, Scroll Lock On	The video card is preventing the computer from completing POST.	Replace the video card. Replace the system board.
Figure 8: Num Lock Flashing, Caps Lock Flashing, Scroll Lock Off	The keyboard is preventing the computer from completing POST.	Reseat the keyboard cable. Replace the keyboard. Replace the system board.
Figure 9: Num Lock Flashing, Caps Lock Off, Scroll Lock Flashing	The USB controller encountered a problem during initialization.	Remove any USB devices. Replace the system board.
Figure 10: Num Lock On, Caps Lock Flashing, Scroll Lock Flashing	No SODIMMs are installed.	Install the memory modules. Reseat the memory modules. Replace the memory modules. Replace the system board.
Figure 11: Num Lock Flashing, Caps Lock On, Scroll Lock Flashing	The LCD encountered a problem during initialization.	Reseat the LCD cable. Replace the LCD panel. Replace the video card.
Figure 12: Num Lock Off, Caps Lock Flashing, Scroll Lock Flashing	The modem is preventing the computer from completing POST.	Reseat the modem. Replace the modem. Replace the system board.

Note: Helpful troubleshooting resources

If an error code is not listed above, contact Dell Technical Support.

Dell Latitude Tablets

Beep Codes
LED Error Codes

Beep Codes

The computer may emit a series of beeps during startup if the display cannot show errors or problems. These series of short, repetitive beeps, called beep codes, identify various computer faults.

Beep Code	Fault Description	Suggested Remedy
1	BIOS ROM checksum in progress or failure	System board failure (covers BIOS corruption or ROM error).
2	Memory	No memory or RAM detected
3	Chipset Error (North and South bridge error, DMA/IMR/Timer error) Time-Of-Day Clock test failure Gate A20 failure Super input/output chip failure Keyboard controller test failure	System board failure
4	RAM Read/Write failure	Memory or RAM failure
5	Real-time clock power failure	Reseat the CMOS battery connection. If the problem persists, this may indicate a possible CMOS battery or system board failure.
6	Video BIOS test failure	Video card or Chip failure
7	CPU cache test failure	Processor failure
8	LCD	LCD failure

LED Error Codes

The Power Button LED, or an agreed-upon alternate LED, blinks in a repeating pattern to communicate diagnostic information. See the table below for these LED blinking codes and their corresponding errors.

Note: For the No memory or RAM detected error, the Power Button LED blinks two times followed by a pause, and then repeats until the computer is powered off.

Figure 13: LED Codes

LED Code	Fault Description	Suggested Remedy
1	System Board: BIOS ROM failure	System board (covers BIOS corruption or ROM error).
2	Memory	No memory or RAM detected
3	System board failure Chipset Error Clock failure Gate A20 failure Super I/O failure Keyboard controller failure	System board failure
4	Memory	Memory or RAM failure
5	Real-time clock failure	Reseat the CMOS battery connection. If the problem persists, this may indicate possible battery or system board failure.
6	Video BIOS	Video card or Chip failure
7	CPU	Processor failure
8	LCD	LCD failure

Note:
What to do next? - If the LED codes point towards possible battery failure, see the Dell knowledge base articles.

If an error code is not listed above, contact Dell Technical Support.

Diagnostic and Battery Indicators for Dell Latitude Laptops and Tablets