Fru Tests - Lenovo ThinkPad T420 Hardware Maintenance Manual

FRU tests

The following table shows the test for each FRU.
Table 1. FRU tests
FRU
Systemboard
Power
LCD unit
Audio
Speaker
Keyboard
Hard disk drive or solid state
drive
Diskette drive
Optical drive
Memory
TrackPoint or pointing
device
Touch Pad
Applicable test
1. Diagnostics ➙ CPU/Coprocessor
2. Diagnostics ➙ Systemboard
3. If the docking station or the port replicator is attached to the ThinkPad Notebook,
detach it.
4. Place the computer on a horizontal surface, and run Diagnostics ➙ ThinkPad
Devices ➙ HDD Active Protection Test.
Note: Do not apply any physical shock to the computer while the test is running.
Diagnostics ➙ ThinkPad Devices ➙ ac power adapter, Battery 1 (Battery2)
1. Diagnostics ➙ Video Adapter
2. Interactive Tests ➙ Video
Enter the ThinkPad Setup program and change Serial ATA (SATA) setting to
Compatibility, and run Diagnostics ➙ Other Device ➙ Conexant Audio.
Interactive Tests ➙ Internal Speaker
Note: Once Audio test is done, the no sound is heard this test. In this case, turn off
and turn on the computer. Then, run this test again.
1. Diagnostics ➙ Systemboard ➙ Keyboard
2. Interactive Tests ➙ Keyboard
Enter the ThinkPad Setup program and change Serial ATA (SATA) setting to
Compatibility, and run Diagnostics ➙ Fixed Disks.
1. Diagnostics ➙ Diskette Drives
2. Interactive Tests ➙ Diskette
1. Diagnostics ➙ Other Devices ➙ Optical Drive
2. Interactive Tests ➙ Optical Drive Test
1. If two DIMMs are installed, remove one of them and run Diagnostics ➙ System
Memory.
2. If the problem does not recur, return the DIMM to its place, remove the other one,
and run the test again.
If the TrackPoint does not work, check the coniguration as speciied in the ThinkPad
Setup program. If the TrackPoint is disabled, select Automatic to enable it.
After you use the TrackPoint, the pointer may drift on the screen for a short time. This
drift can occur when a slight, steady pressure is applied to the TrackPoint pointer.
This symptom is not a hardware problem. If the pointer stops after a short time, no
service action is necessary.
If enabling theTrackPoint does not correct the problem, continue with the following:
• Interactive Tests ➙ Mouse
If the Touch Pad does not work, check the coniguration as speciied in the ThinkPad
Setup program. If the Touch Pad is disabled, select Automatic to enable it. If enabling
the Touch Pad does not correct the problem, continue with the following:
• Interactive Tests ➙ Mouse
.
Chapter 3 General checkout
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