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Dell Technologies Server Troubleshooting Guide

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System board diagnostic LED indicators

The system board LED indicators provide status of the system when it is powered on, which help identify POST and hardware issues.

For information about the different LED indicator sequences and description, see the interactive LED pattern decoder tool -Blink

Table 1. LED statusBelow table shows what the LED status indicates.
LED Status
○ LED Off
● LED on
B Blinking LED
* LED Off : PFAULT
LED Blink : FAILSAFE Timeout
LED On : FAILSAFE Strike Out
Table 2. Power-up LED sequenceThis table describes power-up LED sequence.
Power-Up Sequence
LED7 LED6 LED5 LED4 LED3 LED2 LED1 Description
○ ○ ○ ○ ○ ○ ● 2.5V_AUX EN. Waiting for 2.5V_AUX PG
○ ○ ○ ○ ○ ● ○ 1.8V_AUX EN. Waiting for 1.8V_AUX PG
○ ○ ○ ○ ○ ● ● 5V SW EN. CKMNG EN. Waiting for 5V SW PG
○ ○ ○ ○ ● ○ ○ V_PVNN EN. Waiting for V_PVNN PG
○ ○ ○ ○ ● ○ ● 1.05V SW EN. Waiting for 1.05V SW PG
○ ○ ○ ○ ● ● ○ V_VSBM EN. Waiting for V_VSBM PG
○ ○ ○ ○ ● ● ● V_VSB11 EN. Waiting for V_VSB11 PG
○ ○ ○ ● ○ ○ ● Waiting for PCH_SLP_SUS_N. PCH_RSMRST_N still asserted
○ ○ ○ ● ○ ● ○ Config check. Waiting for BMC to boot. PCH_RSMRST_N de-asserted
○ ○ ○ ● ○ ● ● Waiting for PWR button
○ ○ ○ ● ● ○ ○ 12V EN. Waiting for PSU* PG
○ ○ ○ ● ● ● ● 3.3V_AB EN. Waiting for 3.3V A+B PG
○ ○ ● ○ ○ ○ ○ BP VRs EN. Waiting for BP* PG
○ ○ ● ○ ○ ○ ● MEM VPP EN. Waiting for MEM VPP PGs
○ ○ ● ○ ○ ● ○ MEM VDDQ EN. Waiting for MEM VDDQ PGs
○ ○ ● ○ ○ ● ● MEM VTT EN. Waiting for MEM VTT PGs
○ ○ ● ○ ● ○ ○ CPU* VCCIO and PCIe clocks EN. Waiting for CPU VCCIO PGs
○ ○ ● ○ ● ○ ● CPU* VCORE/VSA EN. Waiting for CPU* VCORE+VSA PGs
○ ○ ● ○ ● ● ○ Waiting for NDC PG
○ ○ ● ○ ● ● ● Waiting for PCH PROCPWRGD
○ ○ ● ● ○ ○ ○ CPU* PG Asserted. SYS PWRGOOD Asserted
● ● ● ● ● ● ● RUN State
○ ○ ● ● ○ ● ○ PLTRST_N Asserted
○ ○ ● ● ○ ● ● CPU & MEM VR’s Shutdown
○ ○ ● ● ● ○ ○ MAIN Rails Shutdown (7 seconds)
Table 3. NvDIMM LED sequenceThis table describes NvDIMM LED sequence.
NvDIMM
LED7 LED6 LED5 LED4 LED3 LED2 LED1 Description
● ● ● ● ● ● ● RUN State – System operating normally
● ○ ○ ○ ● ○ ○ System powered down, NVsave in progress
● ○ ○ ● ● ○ ● NVsave complete. Asserting EMMC_PWROFF_NOTIFY_N to BMC
○ ○ ○ ○ ○ ○ ○ V_12V_SW powered down. System in G3, waiting for AC power
Table 4. System board LED sequenceThis table describes system board LED sequence.
Error
LED7 LED6 LED5 LED4 LED3 LED2 LED1 Description
B ○ ○ ○ ○ ○ B Config Error: CPU1 present? DIMMs OK? Install DBG JMPR1 to bypass
B B ○ ○ ○ B B CPU IERR
○ ● ● ● ● ● ○ CPU COMBINED MCERR
B B B B B B B Thermal Issue on CPU* or MEM
B ○ B B B ○ B Internal VR Issue on CPU*
B ○ ○ ● ○ ○ B AUX Power Failsafe
Table 5. Pfault or failsafe errors LED sequenceThis table describes the Pfault or failsafe errors LED sequence.
Pfault or Failsafe Errors
LED7 LED6 LED5 LED4 LED3 LED2 LED1 Description
* B ○ ○ ○ ○ ○ 12V Failure
* B ○ ○ ○ ○ ● 5V BP0 Failure
* B ○ ○ ○ ● ○ 5V BP1 Failure
* B ○ ○ ○ ● ● 5V BP2 Failure
* B ○ ○ ● ○ ○ 3.3V A Failure
* B ○ ○ ● ○ ● 3.3V B Failure
* B ○ ○ ● ● ○ 5V SW Failure
* B ○ ○ ● ● ● 1.05V SW Failure
* B ○ ● ○ ○ ○ CPU1 VCORE Failure
* B ○ ● ○ ○ ● CPU2 VCORE Failure
* B ○ ● ○ ● ○ CPU1 VCCIO Failure
* B ○ ● ○ ● ● CPU2 VCCIO Failure
* B ○ ● ● ○ ○ CPU1 VSA Failure
* B ○ ● ● ○ ● CPU2 VSA Failure
* B ○ ● ● ● ○ CPU1 MEM012 VTT Failure
* B ○ ● ● ● ● CPU1 MEM345 VTT Failure
* B ● ● ○ ○ ○ CPU2 MEM012 VTT Failure
* B ● ○ ○ ○ ● CPU2 MEM345 VTT Failure
* B ● ○ ○ ● ○ CPU1 MEM012 VPP Failure
* B ● ○ ○ ● ● CPU1 MEM345 VPP Failure
* B ● ○ ● ○ ○ CPU2 MEM012 VPP Failure
* B ● ○ ● ○ ● CPU2 MEM345 VPP Failure
* B ● ○ ● ● ○ CPU1 MEM012 VDDQ Failure
* B ● ○ ● ● ● CPU1 MEM345 VDDQ Failure
* B ● ○ ○ ○ ○ CPU2 MEM012 VDDQ Failure
* B ● ● ○ ○ ● CPU2 MEM345 VDDQ Failure
* B ● ● ○ ● ○ V_PVNN SW Failure
* B ● ● ○ ● ● 1.8V SW Failure
* B ● ● ● ○ ○ V_VSB11 SW Failure
* B ● ● ● ○ ● V_VSBM SW Failure
* B ● ● ● ● ○ NDC Failure
* B ● ● ● ● ● 2.5V SW Failure

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