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4.2 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 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 4.2.3 for

further instructions.

4.2.1 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 on the Main Board). With a power problem, all LEDs

are extinguished, the LCD screen is blank, the system does not respond

when the suspend switch 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:

• 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

Suspend or sleep mode.

• Measure the voltage at the AC Outlet or plug in a known good appliance

(EG. a lamp) to verify that voltage is present. If the voltage is O.K., try

replacing the AC Adapter.

• Check to see that the battery packs are installed correctly and that the

battery charge indicators on the front of the battery packs indicate the

batteries are charged (try using a new battery pack if batteries are

discharged).

• If the AC outlet voltage, AC Adapter, and battery packs test normal but

the computer will not power up, replace the Main Board as described in

Section 5.

4.2.2 Troubleshooting a Display Problem

If the LCD remains blank when you turn on the computer, and the status

indicators light, check the following controls on the display (See Figure 3-1):

• Brightness - Adjust the Brightness control to a higher setting.

• LCD suspend mode - If the LCD backlight remains off, even with the

Brightness Control set to its highest position, the LCD may be in the

Suspend Mode. In Suspend Mode, the power/suspend indicator glows

amber. Press any key to power up the system.

4-4 Troubleshooting Procedures

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Texas Instruments 5000 Bedienungsanleitung Seite 96