Diagnostics - Dell OptiPlex 7480 All-In-One Service Manual

3. Press and hold the power button.
4. Release the power button.
5. Hold the display built-in self test button until the test starts.

Diagnostics

Power status indicator light: Indicates the power status.
Solid amber—The system is unable to boot to the operating system. This indicates that the power supply or another device in the
system is failing.
Blinking white—The system is unable to boot to the operating system. This indicates that the power supply is normal but another device
in the system is failing or not installed properly.
NOTE: See the light patterns to determine if the device that is failing.
Off—System is in hibernation or turned off.
The power status indicator blinks amber along with beep codes indicating failures.
For example, the power status indicator blinks amber two times followed by a pause, and then blinks white three times followed by a
pause. This 2,3 pattern continues until the system is turned off indicating the Recovery image is not found.
The following table shows different light patterns and what they indicate:
Table 19. Diagnostic LED behavior
Blinking pattern
Amber
1 1
1 2
1 5
1 6
2 1
2 2
2 3
2 4
2 5
2 6
2 7
2 8
3 1
White
MBIST: TPM Detection Failure
MBIST:SPI flash, Unrecoverable SPI flash
failure
i-Fuse: Failure EC unable to program i-Fuse
EC internal: Failure Generic catch-all for
ungraceful EC code flow errors
Processor failure
System board: BIOS or ROM (Read-Only
Memory) failure
No memory or RAM (Random-Access
Memory) detected
Memory or RAM (Random-Access Memory)
failure
Invalid memory installed
System-board or chipset error
Display failure
LCD power rail failure
CMOS battery failure
Problem description Suggested resolution
Replace the system board.
Replace the system board.
Replace the system board.
Disconnect all power source (AC, battery,
coin-cell) and press and hold the power
button to drain flea power.
Run the Intel CPU diagnostics tools. If
problem continues, replace the system
board.
Flash the latest BIOS version. If problem
continues, replace the system board.
Check and confirm that the memory
module is installed properly. If problem
continues, replace the memory module.
Reset the memory module. If problem
continues, replace the memory module.
Reset the memory module. If problem
continues, replace the memory module.
Flash the latest BIOS version. If problem
continues, replace the system board.
Flash the latest BIOS version. If problem
continues, replace the LCD module.
Replace the system board.
Reset the CMOS battery connection. If
problem continues, replace the RTS
battery.
Troubleshooting 99