Dell Vostro 3681, Service Manual

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Troubleshooting
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell Inspiron, systems from No POST/No
Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.
Start the RTC reset with the system powered off and connected to AC power. Press and hold the power button for thirty (30) seconds.
The system RTC Reset occurs after you release the power button.
System diagnostic lights
Power-supply diagnostics light
Indicates the status of the power-supply in either of the two sates:
• Off: No Power
• On: Power is supplied.
Power button light
Table 4. Power button LED status
Power button LED state System state Description
Off
• S4
• S5
There is in Hibernate or Off state.
Solid White S0 Working state
Solid Amber Various sleep states or No POST
Blinking Amber/White Failure to POST
This platform relies on the Power button LED light blinking in an amber/white pattern to determine a failure as listed in the following table:
NOTE:
The blinking patterns consists of two numbers (representing First Group: Amber blinks, Second Group: White blinks).
• First Group: The Power button LED light blinks Amber, 1 to 9 times followed by a short pause with LED off for a
couple of seconds.
• Second Group: The Power button LED light then blinks White, 1 to 9 times, followed by a longer pause before the
next cycle starts again after a short interval.
.
Example : No Memory detected (2,3). Power button LED blinks 2-times in Amber followed by a pause, and then blinks 3-times in White.
The Power button LED will pause for few seconds before the next cycle repeats itself again.
Table 5. Diagnostics LED codes
Diagnostic light codes Problem description
1,2 Unrecoverable SPI flash failure
2,1 CPU failure
2,2 System board failure, corrupt BIOS, ROM error
2,3 No memory/RAM detected
4
Troubleshooting 57