Texas Instruments TravelMate 5000 Series, Maintenance Manual

Page: 93 / 286

4
Troubleshooting Procedures
This section provides an overview of the fault isolation process, provides
guidelines for isolating computer malfunctions to replaceable subassemblies
and provides instructions for executing diagnostics and interpreting error
messages.
4.1 Overview of Fault Isolation
Process
The fault isolation process (summarized in Figure 4-1) consists of the
following:
•
Quick Check
of the following:
•
Notebook power system (including battery packs and AC
Adapter connections)- See Paragraph 4.4.
•
Switch settings (ensure Power switch is On, and press
Suspend
switch to ensure that Notebook is not in
Suspend
mode; press Shift to ensure the notebook is not in
Auto-Suspend mode.
•
All external cabling (if any)
•
Check LCD brightness adjustment
•
Ensure that computer is not set for external monitor (cycle
power or use VGA/LCD command).
•
Record and attempt to resolve any displayed error messages/LED
indications (See Paragraph 4.2.3.1 and Tables 4-1 and 4-2)
•
Record and attempt to resolve any series of beeps emitted from the
notebook indicating test failure (See Table 4-2)
•
Try rebooting the system ( CTRL-ALT-DEL ); restore system from
diskettes, if necessary.
•
If the computer is capable of running the Setup program; check the
serial and parallel port configurations, Sound System enable/disable,
and other features that may affect system operation.
•
Run PC-Doctor Diagnostics to further isolate problem area (See
Paragraph 4.2.5).
•
For indicated hardware failures, cycle power and repeat self test to
verify that a hard failure has occurred.
•
Remove and replace suspect hardware (as described in Section 5 of this
manual) and retest the system using the diagnostic tests as described in
paragraph 4.2.5.
Troubleshooting Procedures 4-1