Symptom-To-Fru Index; Numeric Error Codes - Lenovo ThinkPad T420 Hardware Maintenance Manual

Symptom-to-FRU index

This section contains following information:
• "Numeric error codes" on page 43
• "Error messages" on page 45
• "Beep symptoms" on page 46
• "No-beep symptoms" on page 46
• "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 irst, 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
0177
Bad SVP data, stop POST task-The checksum of the
supervisor password in the EEPROM is not correct.
0182
Bad CRC2. Enter the ThinkPad Setup program and load
Setup defaults.-The checksum of the CRS2 setting in
the EEPROM is not correct.
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.
0188
Invalid RFID Serialization Information Area.
0189
Invalid RFID coniguration information area-The
EEPROM checksum is not correct.
0190
Critical low-battery error
FRU or action, in sequence
System board.
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.
System board.
System board.
System board.
1. Charge the battery pack.
2. Battery pack.
Chapter 4
.
Related service information
43