Document fins/I0905-1
FIN #: I0905-1
SYNOPSIS: A small number of Sun Cobalt RaQ 550 systems may fail to boot when
powered up from a cold start
DATE: Dec/10/02
KEYWORDS: A small number of Sun Cobalt RaQ 550 systems may fail to boot when
powered up from a cold start
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- Sun Proprietary/Confidential: Internal Use Only -
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FIELD INFORMATION NOTICE
(For Authorized Distribution by SunService)
SYNOPSIS: A small number of Sun Cobalt RaQ 550 systems may fail to boot
when powered up from a cold start.
SunAlert: No
TOP FIN/FCO REPORT: No
PRODUCT_REFERENCE: Sun Cobalt RAQ550 Servers
PRODUCT CATEGORY: Server / Service
PRODUCTS AFFECTED:
Systems Affected:
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Mkt_ID Platform Model Description Serial Number
------ -------- ----- ----------- -------------
- CBT-R5 ALL Sun Cobalt RAQ 550 -
X-Options Affected:
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Mkt_ID Platform Model Description Serial Number
------ -------- ----- ----------- -------------
CBT-R5DJ42VIM - - RaQ 550 - 1.0GHz 256MB 1X40GB -
CBT-R5DJN2VIM - - RaQ 550 - 1.0GHz 256MB 2X40GB -
CBT-R5EJ80VIM - - RaQ 550 - 1.26GHz 256MB 1X80GB -
CBT-R5EH02VIM - - RaQ 550 - 1.26GHz 512MB 2X80GB -
CBT-R5EK02VIM - - RaQ 550 - 1.26GHz 1GB 2X80GB -
PART NUMBERS AFFECTED:
Part Number Description Model
----------- ----------- -----
380-0567-02 ASSY SYSTEM 1.26GHZ/1GB -
380-0566-02 ASSY SYSTEM 1.26GHZ/256MB -
380-0565-02 ASSY SYSTEM 1.0GHZ/256MB -
380-0553-02 ASSY SYSTEM 1.0GHZ/256MB -
380-0552-02 ASSY SYSTEM 1.26GHZ/512MB -
REFERENCES:
BugId: #466 - http://mothra.sfbay.sun.com/bugzilla-2.10/show_bug.cgi?id=466
ECO: WO_24185
LEAP: 2104
URL:
http://sdpsweb.central/FIN_FCO/FIN/FINI0905-1_dir/AffectedPartsSNLists
https://ebusiness-amer-8.sun.com/OSCSW/svcportal?pageName=CobaltHardwareRequestPage
PROBLEM DESCRIPTION:
A small percentage of Sun Cobalt RaQ 550 systems may fail to power up
and boot, especially from a cold start. The problem is corrected by
power cycling the unit. Once the system boots up it will function
normally and there will be no impact to customer operations.
This issue affects approximately 1170 RaQ 550 systems which were
shipped between 17-Jun-2002 and 15-Jul-2002. Of these, the expected
failure rate is less than 2%. A group of 630 systems shipped during
this time period is not affected since they have reworked motherboards
and are not included in the 1170 number above.
Note: The 630 unaffected units will have deviation label "PA0702R339"
on the motherboard. A list of serial numbers for this unaffected group
can be found at:
http://sdpsweb.central/FIN_FCO/FIN/FINI0905-1_dir/AffectedPartsSNLists
The following configurations are affected:
---------------------------------------------------------
| Manuf Part Number | Description |
|=========================+===============================|
| 600-7915-01,600-7915-02 | RAQ 550, 1.26GHz/512MB/2X80GB |
| 600-7916-01,600-7916-02 | RAQ 550, 1.0GHz/256MB/2X40GB |
| 600-7938-01,600-7938-02 | RAQ 550, 1.0GHz/256MB/1X40GB |
| 600-7939-01,600-7939-02 | RAQ 550, 1.26GHz/256MB/1X80GB |
| 600-7940-01,600-7940-02 | RAQ 550, 1.26GHz/1GB/2X80GB |
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When the problem occurs, the unit hangs right after power on. The LCD
screen lights up but there is no "Sun Cobalt" logo or display. The top
of the screen is black and the bottom is blank.
Factors which may affect this problem include:
. CPU variation - Some CPUs draw more current than others and are more
susceptible to not powering up.
. Temperature - Lower temperatures worsen the problem.
. Power supply - The PSU supplies 5V and 12V. This problem is sensitive
to the ramp times and the relationship between these two
voltages. This can vary between PSUs.
This issue occurs because the CPU power-up current is much higher than
the specification provided by the vendor. While the datasheet lists
Vcore ICC(max) as 20.2A, the power consumption measured is 27.4A on
processors installed in the failing systems. This excess current
causes the power supply to shut down.
The problem happens more often when the system is powered on from a
cold start. Since there are big capacitors associated with this
circuit, more current is needed to charge up the capacitors at the
first power-up. Subsequent power-ups require less current.
This problem has been addressed via ECO# WO_24185 on June 25, 2002.
The fix for this ECO is to increase the Vcore ICC shutdown current by
replacing R339 with a 9.31K resistor. This value is chosen based on
the worst case current from the Intel chip and the power supply.
Should the problem be encountered in the Field, please employ the
workaround provided below.
IMPLEMENTATION:
---
| | MANDATORY (Fully Proactive)
---
---
| | CONTROLLED PROACTIVE (per Sun Geo Plan)
---
---
| X | REACTIVE (As Required)
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CORRECTIVE ACTION:
The following recommendation is provided as a guideline for authorized
Sun Services Field Representatives who may encounter the above
mentioned problem.
If this power-up problem with Sun Cobalt RaQ 550 systems is encountered
in the Field, the affected system should be power cycled. Sun Product
Engineering expects this to be effective 99% of the time. If the system
fails to come up after multiple power cycle attempts, return the unit
for repair/replacement per standard process.
Online Sun Cobalt hardware replacement requests can be made at:
https://ebusiness-amer-8.sun.com/OSCSW/svcportal?pageName=CobaltHardwareRequestPage
COMMENTS:
None
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Implementation Footnote:
i) In case of MANDATORY FINs, Enterprise Services will attempt to
contact all affected customers to recommend implementation of
the FIN.
ii) For CONTROLLED PROACTIVE FINs, Enterprise Services mission critical
support teams will recommend implementation of the FIN (to their
respective accounts), at the convenience of the customer.
iii) For REACTIVE FINs, Enterprise Services will implement the FIN as the
need arises.
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General:
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