Tablet LED
This section details the diagnostic features of the battery LED in a tablet.
Diagnostic LED
Tablets rely on the Battery LED light blinking amber/white pattern to determine failures listed in the following table:
NOTE:
•
The blinking patterns will consist of 2 sets of numbers being represented by (First Group: Amber blinks, Second Group: White
blinks)
•
First Group: The LED blinks 1 to 9 times followed by a brief pause with LED off at the interval of 1.5 seconds. (This is in Amber
color)
•
Second Group: The LED blinks 1 to 9 times, followed by a longer pause before the next cycle starts again at the interval of 1.5
seconds. (This is in White color)
•
Example
: No Memory detected (2,3), Battery LED blinks two times of amber color followed by a pause, and then blinks three times
of white color. The Battery LED will pause for 3 seconds before the next cycle repeat itself again
The following table depicts the amber and white blinking patterns with possible troubleshooting resolution:
Table 1. LED pattern
Blinking pattern
Problem Description
Suggested Resolution
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
Real Time Clock (RTC) reset
The Real Time Clock (RTC) reset function allows you or the service technician to recover the recently launched model Dell Latitude and
Precision systems from select
No POST/No Boot/No Power
situations. You can initiate the RTC reset on the system from a power off
state only if it is connected to AC power. Press and hold the power button for 25 seconds. The system RTC reset occurs after you release
the power button.
NOTE:
If AC power is disconnected from the system during the process or the power button is held longer than 40 seconds, the
RTC reset process is aborted.
The RTC reset will reset the BIOS to Defaults, un-provision Intel vPro and reset the system date and time. The following items are
unaffected by the RTC reset:
Troubleshooting
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