IBM ThinkPad A21m, Hardware Maintenance Manual

Page: 55 / 158

Symptom-to-FRU index
The symptom-to-FRU index in this section lists symptoms
and errors and their possible causes. The most likely
cause is listed first, in boldface type.
Note: Do the FRU replacement or other actions in the
sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not
solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular
servicing, what FRUs are likely to need to be replaced
next.
A numeric error is displayed for each error detected in
POST or system operation. In the displays, n can be any
number.
If no numeric code is displayed, check the narrative
descriptions of symptoms. If the symptom is not described
there, go to “Intermittent problems” on page 55.
Note
For an IBM device not supported by diagnostic
codes in the ThinkPad notebook computers, see the
manual for that device.
Numeric error codes
Symptom or error FRU or action, in sequence
0175
Bad CRC1, stop POST task —
The EEPROM checksum is not
correct. System board.
0187
EAIA data access error — The
access to EEPROM has failed. System board.
0188
Invalid RFID serialization
information area or bad CRC2
— The EEPROM checksum is
not correct. System board.
0189
Invalid RFID configuration
information area — The
EEPROM checksum is not
correct. System board.
(continued)
Symptom-to-FRU index
ThinkPad A20m/p, A21m/p and A22m/p
49