Lenovo C540 Touch All-in-One - Manual (Page 38)

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User Guide
Problem: Ripple on screen.
Troubleshooting and problem resolution:
1. Check to see if any of the following devices are located less than one meter
from the computer: refrigerators, electric fans, electric dryers, UPS systems,
regulators, fluorescent lamps or other computers that may be generating
magnetic interference.
2. Move any interfering devices away from the computer.
3. If the problem persists, contact Lenovo Service.
Troubleshooting Touch screen
Problem: The touch screen reacts, but not where you are touching it.
Troubleshooting and problem resolution:
Touch Screen Calibration:
1. In Control Panel, select “Hardware and Sound”.
2. In “Hardware and Sound” window, select “Tablet PC Settings”.
3. In “Tablet PC Settings” dialogue, click “Calibrate” button.
Troubleshooting Audio Problems
Problem: No sound from the integrated speakers.
Troubleshooting and problem resolution:
• Adjust the Windows volume control — select the speaker icon from the
Settings Charm or click the arrow on taskbar to show the hidden icons in
Windows desktop mode, then click the speaker icon. Ensure that the volume
is turned up and the sound is not muted. Adjust the volume, bass, or treble
controls to eliminate distortion.
• Reinstall the audio driver.
• Disconnect any headphones from the headphone connector — sound from
the speakers is automatically disabled when headphones are connected to the
computer’s side-panel headphone connector.