Lenovo ThinkPad T495, Hardware Maintenance Manual

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Symptom-to-FRU index
This section contains following information:
• “Numeric error codes” on page 36
• “Error messages” on page 38
• “Beep errors” on page 38
• “No-beep symptoms” on page 40
• “LCD-related symptoms” on page 40
• “Intermittent problems” on page 41
• “Undetermined problems” on page 41
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 41.
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 (beeps, if any) FRU or action, in sequence
0177
Bad SVP data, stop POST task—The checksum of the
supervisor password in the EEPROM is not correct.
Replace the system board.
0183
Bad CRC of Security Settings in EFI Variable. Enter the
ThinkPad Setup program. – The checksum of the Security
settings in the EFI Variable is not correct.
1. Run the ThinkPad Setup program. The settings
will be corrected automatically. Then save the
current settings by pressing F10.
2. Replace the system board.
0187
EAIA data access error - The access to EEPROM is failed.
Replace the system board.
0188
Invalid RFID Serialization Information Area.
Replace the system board.
0189
Invalid RFID configuration information area - The
EEPROM checksum is not correct.
Replace the system board.
0190
Critical low-battery error
1. Charge the battery.
2. Replace the battery.
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T495 Hardware Maintenance Manual