Texas Instruments 51X - Manual (Page 50)

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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, and other features that may
affect system operation.
•
Run Diagnostics to further isolate problem area (refer to Paragraph
5.3.5).
•
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 6 of this
manual) and retest the system using the diagnostic tests as described in
Paragraph 5.3.5.
The detailed block diagram, shown in Figure 5-2, is useful in performing
fault analysis of various internal subsystems. For example, an LCD
hardware problem can be traced to either the LCD, Inverter Board, VR
Board, or Battery Board. Other subsystem problems can be isolated in a
similar fashion using the detailed block diagram as a troubleshooting tool.
5.3 Troubleshooting Procedures
The built-in self test program and the disk resident diagnostics program
(PC-Doctor) are useful tools in computer troubleshooting. However, if the
computer has a power, keyboard or display problem, you should first solve
this problem before running diagnostics. If the computer powers up and
displays messages on the LCD or emits a series of beeps, skip to Paragraph
5.4.3 for further instructions.
5.3.1 Troubleshooting a Power Supply Problem
If the computer does not power up when the Power Switch is set to the ON
position, you most likely have a malfunction in the power subsystem (loss of
power at the AC Outlet, faulty AC Adapter, discharged Battery Packs, or
faulty Power Supply Board). With a power problem, all LEDs are
extinguished, the LCD screen is blank, the system does not respond when
the standby switch is pressed several times consecutively and no drive
activity can be heard. The computer is unable to load software and displays
no visible signs of activity.
To fault isolate a power problem, check the following:
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AC Adapter and Battery - Plug in the AC adapter and double check all
connections on the Adapter and computer. Ensure that the Notebook
Power switch is set to the On position and that the system is not in
Standby or sleep mode.
Troubleshooting 5-3