- Notes, cautions, and warnings
- Working on your computer
- Technology and components
- Using your computer
- AC-DC Adapters
- Battery
- Processors
- Memory features
- Graphics options
- Corning Gorilla Glass
- Pen Usage
- Optical Disk Drive
- Media Card Readers
- UEFI BIOS
- Systems management - From on-premises to the cloud
- Trusted Platform Module
- Fingerprint Reader
- USB features
- USB Powershare
- USB Type-C
- Ethernet
- HDMI 2.0
- Removing and installing components
- Safety instructions
- Recommended tools
- Stylus
- SIM card
- Memory card
- Handle
- Latch Doors
- Battery
- Secondary SSD carrier
- Primary SSD carrier
- SSD
- HDD carrier
- Bottom Chassis Cover
- Keyboard
- WWAN card
- WLAN card
- Global Positioning System (GPS)
- Memory modules
- Coin-cell battery
- PCIe Heatsink Fan Assembly
- Primary SSD Rail
- Docking Port Assembly
- Heatsink Assembly
- Rear Input-Output Board
- Hinge Covers
- Display assembly
- LCD Bezel and Back Cover Assembly
- Microphone
- Camera
- Battery Bay
- Left I/O board
- Smart Card
- ExpressCard Reader
- Speaker
- System board
- Optical drive
- Bottom Base Assembly
- Diagnostics
- Getting help
Dell Latitude 7424 Rugged Extreme Service Manual
Diagnostic LED
This section details the diagnostic features of the battery LED in a laptop.
Instead of beep codes errors are indicated via the bicolor Battery
Charge LED. A specific blink pattern is followed by flashing a
pattern of flashes in green, followed by white. The pattern then
repeats.
NOTE The diagnostic pattern will consist of a two digit number being
represented by a first group of LED blinks (1 through 9) in green,
followed by a 1.5 second pause with the LED off, and then a second
group of LED blinks (1 through 9) in white. This is then followed
by a 3 second pause, with the LED off, before repeating over
again. Each LED blink takes 0.5 seconds.
The system will not shutdown when displaying the Diagnostic Error Codes. Diagnostic Error Codes will always supersede any other use of the LED. For instance, on laptops, battery codes for Low Battery or Battery Failure situations will not be displayed when Diagnostic Error Codes are being displayed:
| Blinking pattern | Problem Description | Suggested Resolution | |
|---|---|---|---|
| Green | White | ||
| 2 | 1 | processor | Processor failure |
| 2 | 2 | system board, BIOS ROM | System board, covers BIOS corruption or ROM error |
| 2 | 3 | memory | No memory/no RAM detected |
| 2 | 4 | memory | Memory failure/RAM failure |
| 2 | 5 | memory | Invalid memory installed |
| 2 | 6 | system board; chipset | System board/ chipset error |
| 2 | 7 | display | Display failure |
| 3 | 1 | RTC power failure | Coin-cell battery failure |
| 3 | 2 | PCI/Video | PCI/Video card/chip failure |
| 3 | 3 | BIOS recovery 1 | Recovery image not found |
| 3 | 4 | BIOS recovery 2 | Recovery image found but invalid |
| 3 | 5 | Power Rail Failure | EC ran into power sequencing failure |
| 3 | 6 | SBIOS Flash Corruption | Flash corruption detected by SBIOS |
| 3 | 7 | ME Error | Timeout waiting on ME to reply to HECI message |
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