Error Messages; Beep Symptoms; No-Beep Symptoms; Lcd-Related Symptoms - Lenovo ThinkPad X1 Carbon Hardware Maintenance Manual

Error messages

Table 3. Error messages
Symptom or error
Fan error.
Thermal sensing error.
The battery installed is not supported by this system
and will not charge. Please replace the battery with the
correct Lenovo battery for this system. Press the ESC
key to continue.

Beep symptoms

Table 4. Beep symptoms
Symptom or error
Four cycles of four short beeps
Five short beeps, pause, and five more short beeps
One short beep, pause, three short beeps, pause, three
more short beeps, pause, and one short beep
Three short beeps, pause, one short beep, pause, one
more short beep, pause, and three short beeps
Five short beeps
One long and two short beeps

No-beep symptoms

Table 5. No-beep symptoms
Symptom or error
No beep, power-on indicator on, LCD blank, and no
POST.
No beep, power-on indicator on, and LCD blank during
POST.
The power-on password prompt appears.
The hard-disk password prompt appears.

LCD-related symptoms

Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The
presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT
LCD technology, but excessive pixel problems can cause viewing concerns.If the LCD you are servicing has
two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more
visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.
Notes:
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Hardware Maintenance Manual
FRU or action, in sequence
1. Fan.
2. Thermal grease.
3. System board.
System board.
Replace the battery.
FRU or action, in sequence
System board
System board
1. Memory module.
2. System board.
Remove the installed PCI devices.
System board
System board
FRU or action, in sequence
1. Ensure that every connector is connected tightly
and correctly.
2. Memory module.
3. System board.
1. Reseat memory module.
2. System board.
A power-on password or a supervisor password is set.
Type the password and press Enter.
A hard-disk password is set. Type the password and
press Enter.