Abnormal Video - Acer Aspire S7-391 Service Manual

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
section on page 4-7.
7. Disconnect power and all external devices including port replicators or docking stations.
8. Start the computer. If the computer boots correctly, add the devices one by one until the
failure point is discovered.
9. Perform the
10. If the issue is still not resolved, refer to the

Abnormal Video

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
"Reassembly
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. 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
6. If the issue is still not resolved, refer to the
7. Run the Windows Memory Diagnostic from the operating system DVD and follow the
on-screen prompts.
8. If the issue is still not resolved, refer to the
4-6
"Reinstalling the M-SATA
Process" procedure described on page 3-39.
Board" procedure described on pages 3-60.
Online Support Information
Online Support Information
Online Support Information
"LCD Failure"
on page 9-3.
0
on page 9-3
on page 9-3
Troubleshooting