Overview of Fault Isolation Process

The fault isolation process (summarized in Figure 5-1) consists of the following:

  • Quick Check of the following:
  • Notebook power system (including battery packs and AC Adapter connections)- refer to Paragraph 5.4.
  • Switch settings (ensure Power switch is On, and press Standby switch to ensure that Notebook is not in Standby mode; press Shift to ensure the notebook is not in Auto-Suspend mode.
  • All external cabling (if any).
  • Check LCD Contrast adjustment (Dual Scan version only).
  • Record and attempt to resolve any displayed error messages/LED indications (refer to Paragraph 5.3 and Table 5-1).
  • Record and attempt to resolve any series of beeps emitted from the notebook indicating test failure (refer to Table 5-2).

When Power button is pressed, no indication of power is present (dark LCD, no Status icons lit, no disk drive activity, etc.)

Press Power button; Selftest automatically runs when power turned on.





5.3.1 & 5.3.2











See Appendix B


Figure 5-1 Troubleshooting Flowchart

  • 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, or Power Supply Board. Other subsystem problems can be isolated in a similar fashion using the detailed block diagram as a troubleshooting tool.

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