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IBM PS/2 - 8550 with processor upgrade hangs during POST
Applicable to: World-Wide
Symptom:
A limited number of 8550Z systems may experience a hang during the POST (Power-On-System-Test) memory count after installation of the 8550Z 486SLC2-50 Processor Upgrade, marketing part number 70G7092, FRU P/N71G2633.
Problem Isolation Aids:
All of the following MUST BE TRUE, for this tip to apply:
a. The system functioned normally prior to the upgrade.
b. If the upgrade is removed, the system will function normally and the diagnostics will run error-free.
c. The modules at system board locations ZM17, ZM30 and ZM39 must have a large "S" on the left side of the module. Refer to the following diagram for the locations of the affected these modules:
d. The module identified above, also has a six character date code such as, 8918KA. If the sixth character position of this code is either an "A" or is blank, the module is affected. If any other Alphanumeric character is in this position the system board is not affected.
Refer to the following diagram for the locations of these modules:
| All of the affected
_ _ _ ___ batttery/ | modules will look
| | | | | | | |<--speaker | like this (Module
|_| |_| |_| |___| connector | shown rotated for
_ _ _ _ | clarity)
| | | | | | | | _____ | __________
ZM39 |_| |_| |_| | | | | 74F573D|
_ _ | 8 | | | S xxxxxx |
| | | | __________ | 0 | | |____8918KA| date
ZM30 ZM17 | | | 2 | | code
| 80286 | | 8 | |
| PROCESSOR| | 7 | |
| MODULE | | | |
| | | SKT | |
|__________| |_____| |
|
______________________________________|
Fix:
If this problem is encountered during the installation of the processor upgrade:
Replace the system board with one which does not have the large "S "on the modules referenced above or with one which does have a large "S" on the module but DOES NOT have an "A" as the last character of the date code suffix.It has been determined that only a small percentage of 8550Z system boards were manufactured with the affected modules. No other functional problem is associated with these modules. This is a compatibility problem related only to the 80486 processor upgrade. Because of the limited exposure and the large quantity of this FRU throughout the Mechanicsburg Parts System, no stock action will be initiated to purge this specific system board FRU. However, action has been taken with the FRU parts source to eliminate the identified module from future FRU stock replenishments. Upon physical inspection, unused system board FRU's with the large "S" and the "A" in the suffix should be returned to the parts distribution system as "good," because they are useable in non-upgraded systems.
FRU 72X8516 - 8550Z SYSTEM BOARD
SAS KEYWORDS:
PSY2 PSY2ERR PSY2ADPT HANGS
HYPERTEC HYPERACE 72X8516 8550Z
PROCESSOR COMPLEX PSY2PART
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Search Keywords |
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Hint Category |
Lock-up/Hang, Processors, Retain | |
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Date Created |
24-08-94 | |
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Last Updated |
25-01-99 | |
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Revision Date |
19-05-99 | |
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Brand |
IBM PC | |
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Product Family |
PS/2 | |
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Machine Type |
8550 | |
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Model |
all | |
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TypeModel |
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Retain Tip (if applicable) |
H124797 | |
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Reverse Doclinks |