Symptom-to-fru index, Numeric error codes – Lenovo T420 User Manual
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Symptom-to-FRU index
This section contains following information:
•
“Numeric error codes” on page 43
•
•
•
•
“LCD-related symptoms” on page 46
•
“Intermittent problems” on page 48
•
“Undetermined problems” on page 48
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 48.
Note: For a device not supported by diagnostic codes in the ThinkPad Notebooks, see the manual for that device.
Numeric error codes
Table 2. Numeric error codes
Symptom or error
FRU or action, in sequence
0177
Bad SVP data, stop POST task—The checksum of the
supervisor password in the EEPROM is not correct.
System board.
0182
Bad CRC2. Enter the ThinkPad Setup program and load
Setup defaults.—The checksum of the CRS2 setting in
the EEPROM is not correct.
1. Run the ThinkPad Setup program. Press F9, and
Enter to load the default setting. Then save the
current setting by pressing F10.
2. System board.
0183
Bad CRC of Security Settings in EFI Variable. Enter the
ThinkPad Setup program.
0187
EAIA data access error—The access to EEPROM is failed.
System board.
0188
Invalid RFID Serialization Information Area.
System board.
0189
Invalid RFID configuration information area—The
EEPROM checksum is not correct.
System board.
0190
Critical low-battery error
1. Charge the battery pack.
2. Battery pack.
Chapter 4
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Related service information
43