Netra T5220 - One or more power supplies show disabled sensors

(Doc ID 2004099.1)

Last updated on MAY 01, 2017

Applies to:

Sun Netra T5220 Server - Version All Versions and later
Information in this document applies to any platform.

Symptoms

Server shows fault in a power supply (prtdiag -v):

Fan indicators:
----------------------------------------------------------------
Location                           Sensor             Condition
----------------------------------------------------------------
SYS/PS0                            FAN_FAULT          ok
SYS/PS1                            FAN_FAULT          disabled

Temperature indicators:
----------------------------------------------------------------
Location                           Indicator          Condition
----------------------------------------------------------------
SYS/PS0                            TEMP_FAULT         ok
SYS/PS1                            TEMP_FAULT         disabled

Current sensors:
----------------------------------------------------------------
Location                           Sensor             Status
----------------------------------------------------------------
SYS/PS0                            I_IN_MAIN          ok
SYS/PS0                            I_IN_LIMIT         ok
SYS/PS0                            I_OUT_MAIN         ok
SYS/PS0                            I_OUT_LIMIT        ok
SYS/PS1                            I_IN_MAIN          disabled
SYS/PS1                            I_IN_LIMIT         disabled
SYS/PS1                            I_OUT_MAIN         disabled
SYS/PS1                            I_OUT_LIMIT        disabled

Current indicators:
----------------------------------------------------------------
Location                           Indicator          Condition
----------------------------------------------------------------
SYS/MB                             I_USB0             ok
SYS/MB                             I_USB1             ok
SYS/PS0                            CUR_FAULT          ok
SYS/PS1                            CUR_FAULT          disabled

Voltage sensors:
----------------------------------------------------------------
Location                           Sensor             Status
----------------------------------------------------------------
SYS/MB                             V_VMEML            ok
SYS/MB                             V_VMEMR            ok
SYS/MB                             V_+3V3_STBY        ok
SYS/MB                             V_VCORE            ok
SYS/MB                             V_+3V3_MAIN        ok
SYS/MB                             V_VDDIO            ok
SYS/MB                             V_+12V0_MAIN       ok
SYS/MB                             V_VBAT             ok
SYS/PS0                            V_IN_MAIN          ok
SYS/PS0                            V_OUT_MAIN         ok
SYS/PS1                            V_IN_MAIN          disabled
SYS/PS1                            V_OUT_MAIN         ok 

However reseating the PSU, replacing the PSU and checking the cables/sockets doesn't fix the problem. Firmware version was pretty recent, discarding possible firmware issues. 
 
The power supply itself shows as fine:
============================ FRU Status ============================
Location                           Name      Status  
------------------------------------------------------ 
SYS                                PS0       enabled  
SYS                                PS1       enabled  <--------

No service LEDs are on:
LEDs:
----------------------------------------------------------------
Location                           LED                State   
----------------------------------------------------------------
SYS                                SERVICE            off     <----------
SYS                                LOCATE             off     
SYS                                ACT                steady



Cause

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