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| CHAPTER 4: Troubleshooting |
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Code | Beeps |
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F4h | 1 | Output one beep before boot |
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F5h |
| Boot to Mini DOS |
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F6h |
| Clear Huge Segment |
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F7h |
| Boot to Full DOS |
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Symptom-to-FRU error messages
LCD
Symptom / Error | Action in Sequence | ||
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■ | The LCD backlight doesn't work. | ■ | Run “Load Setup Defaults” using the BIOS Setup Utility, then reboot |
■ | The LCD is too dark. |
| the notebook. |
■ | The LCD brightness cannot be adjusted. | ■ | Reconnect the LCD connectors. |
■ | The LCD contrast cannot be adjusted. | ■ | Test or replace the keyboard (if contrast and brightness function key |
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| doesn't work). |
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| ■ | Check the LCD inverter ID. |
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| ■ | Test or replace the LCD cable. |
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| ■ | Test or replace the LCD inverter. |
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| ■ | Test or replace the LCD. |
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| ■ | Test or replace the system board. |
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■The LCD screen is unreadable.
■Missing pels in characters.
■The screen appears abnormal.
■The wrong color is displayed.
■Reconnect the LCD connector.
■Check the LCD inverter ID.
■Test or replace the LCD cable.
■Test or replace the LCD inverter.
■Test or replace the LCD.
■Test or replace the system board.
The LCD is displaying extra horizontal or | ■ | Check the LCD inverter ID. |
vertical lines. | ■ | Test or replace the LCD cable. |
| ■ | Test or replace the LCD inverter. |
| ■ | Test or replace the LCD. |
| ■ | Test or replace the system board. |
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Power
Symptom / Error | Action in Sequence | |
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The notebook shuts down during operation. | ■ | Test the power source (battery pack and power adapter). See “Testing |
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| the power system” on page 141. |
| ■ | Test or replace the battery pack. |
| ■ | Test or replace the power adapter. |
| ■ | Test or replace the system board. |
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The notebook doesn’t turn on.
■Test the power source (battery pack and power adapter). See “Testing the power system” on page 141.
■Test or replace the battery pack.
■Test or replace the power adapter.
■Test or replace the system board.
