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Code | Beeps | POST Routine Description |
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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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Index of Symptom-to-FRU Error Message
LCD-Related Symptoms
Symptom / Error | Action in Sequence | ||
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■ | The LCD backlight doesn't work. | ■ | Run BOIS Utility to execute “Load Setup Default Settings”, |
■ | The LCD is too dark. |
| then reboot the notebook. |
■ | The LCD brightness cannot be | ■ | Reconnect the LCD connectors. |
| adjusted. | ■ | Test or replace the keyboard (if contrast and brightness |
■ | The LCD contrast cannot be adjusted. |
| function key 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 has extra horizontal or vertical | ■ | Check the LCD inverter ID. |
lines displayed. | ■ | Test or replace the LCD inverter. |
| ■ | Test or replace the LCD cable. |
| ■ | Test or replace the LCD. |
| ■ | Test or replace the system board. |
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