Acer TravelMate P643-V, Service Manual

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4-6 Troubleshooting
3. Drain stored power by removing the power cable and the battery pack. Hold the power
button for 10 seconds.
4. Connect the power cable and reboot the computer.
5. Connect an external monitor to the computer and switch between the internal display and
the external display by pressing
Fn + F5 .
6. If the POST or video appears on the external display only, refer to the “ LCD Failure”
section on page 4-7 .
7. Disconnect power and all external devices including port replicators or docking stations.
8. Remove any memory cards and CD/DVD discs.
9. Start the computer. If the computer boots correctly, add the devices one by one until the
failure point is discovered.
10. Reseat the memory modules.
11. Perform the “ Removing the HDD Module ” and “ Removing the ODD Module ” procedures
described on pages 3-15 and 3-11 respectively.
12. If the issue is still not resolved, refer to the Online Support Information on page 8-3 .
Abnormal Video
0
If the video appears abnormal, perform the following one at a time.
1. Boot the computer.
If permanent vertical/horizontal lines or dark spots appear in the same location, the LCD
panel is faulty and should be replaced. The same goes for when there is extensive pixel
damage (i.e. different colored spots in the same locations on the screen). Perform the
“
Removing the LCD Module ” and “ Removing the LCD Panel ” procedures described on
pages 3-45 and 3-53 respectively.
NOTE: NOTE :
Make sure that the computer is not running on battery alone as this may reduce display
brightness.
2. Adjust the brightness to its highest level. Refer to the User Manual for instructions on
adjusting the settings. If the display is too dim at the highest brightness setting, the LCD is
faulty and should be replaced. Refer to Disassembly Process.
3. Check the display resolution is correctly configured:
 Minimize or close all Windows.
 If display size is only abnormal in an application, check the view settings and
control/mouse wheel zoom feature in the application.
 If desktop display resolution is not normal, right-click on the desktop and select
Personalize Display Settings
.
 Click and drag the Resolution slider to the desired resolution.
 Click Apply and check the display. Readjust if necessary.
4. Roll back the video driver to the previous version if updated.
5. Remove and reinstall the video driver.
6. Check the Device Manager to determine that:
 The device is properly installed. There are no red Xs or yellow exclamation marks
 There are no device conflicts
 No hardware is listed under
Other Devices