Lenovo ThinkSmart Hub, Hardware Maintenance Manual

Page: 39 / 82

Check/Verify
FRU/Action
Check the following for proper installation.
• Power cord
• On/Off switch connector
• On/Off switch power supply connector
• System board power supply connectors
• Microprocessor connection
Reseat connectors
Check the power cord for continuity. Power cord
Check the power-on switch for continuity. Power-on switch
POST error codes
Each time you turn on the system, it performs a series of tests that check the operation of the system and
some options. This series of tests are called the
Power-On Self-Test , or POST . POST checks the following
operations:
• Some basic system-board operations
• Memory operation
• Video operation
• Whether the boot drive is working
If the POST detects a problem, an error message appears on the screen. A single problem might cause
several error messages to appear. When you correct the cause of the first error message, the other error
messages probably will not appear on the screen the next time.
Error code
POST error message Description/Action
0135
CPU fan failure
System fan failure
Power fan failure
Front fan failure
Rear fan failure
Auxiliary fan failure
ODD fan failure
This error message is displayed
when a fan fails and the system
might be overheating.
Press F10 to exit.
0211 Keyboard not found
This error message is displayed
when no keyboard is detected.
0162 Setup data integrity check failure
This error indicates the checksum
of BIOS Setup data in NVRAM is
bad.
In BIOS Setup, the “Save
Changes and Exit” operation is
needed in order to clear this error.
Chapter 4
.
Service checkout and symptom-to-FRU index
33