Acer Aspire 4743, Service Manual

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4-6 Troubleshooting
5. Connect an external monitor to the computer and switch between the internal display and
the external display is by pressing Fn+F5.
6. If the POST or video appears on the external display only, refer to LCD Failure .
7. Disconnect power and all external devices including port replicators or docking stations.
Remove any memory cards and CD/DVD discs.
8. Start the computer. If the computer boots correctly, add the devices one by one until the
failure point is discovered.
9. Reseat the memory modules.
10. Remove the drives (refer to Disassembly Process ).
11. If the Issue is still not resolved, refer to Online Support Information .
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 is faulty and should be replaced. Refer to Disassembly Process.
 If extensive pixel damage is present (different colored spots in the same locations on
the screen), the LCD is faulty and should be replaced. Refer to Disassembly Process.
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
7. If the Issue is still not resolved, refer to Online Support Information .
4. Run the Windows Memory Diagnostic from the operating system DVD and follow the
on-screen prompts.
5. If the Issue is still not resolved, refer to Online Support Information .