Lenovo 20MU, Hardware Maintenance Manual

Page: 42 / 109

• “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 notebook computers, 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.
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 pack.
2. Replace the battery pack.
0191
System Security—Invalid Remote Change requested.
1. Run the ThinkPad Setup program, and then save
current setting by pressing F10.
2. Replace the system board.
0199
System Security— Security password retry count
exceeded.
1. Run the ThinkPad Setup program. The retry count
will be reset. Then save the current settings by
pressing F10.
2. Replace the system board.
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A485 Hardware Maintenance Manual