Troubleshooting - Dell Latitude 7390 Owner's Manual

Dell Enhanced Pre-Boot System Assessment — ePSA
diagnostic 3.0
You can invoke the ePSA diagnostics by performing either of the following steps:
• Press the F12 key when the system boots and choosing Diagnostics option.
• Press Fn+PWR when the system boots.
For more details, see Dell EPSA Diagnostic
Diagnostic LED
This section details the diagnostic features of the battery LED in a notebook.
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 amber, 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
amber, 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 three 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 Notebooks, battery codes for Low Battery or Battery Failure situations will not be displayed when Diagnostic
Error Codes are being displayed:
Table 9. LED pattern
Blinking pattern Problem Description
Amber White
2 1 processor
2 2 system board, BIOS ROM
2 3 memory
2 4 memory
2 5 memory
2 6 system board; chipset
2 7 display
3 1 RTC power failure
3 2 PCI/Video
3 3 BIOS recovery 1
3 4 BIOS recovery 2
3.0.
Suggested Resolution
processor failure
system board, covers BIOS corruption or ROM error
no memory/no RAM detected
memory failure/RAM failure
invalid memory installed
system board/ chipset error
display failure
coin-cell battery failure
PCI/Video card/chip failure
recovery image nor found
recovery image found but invalid

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