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Lenovo 10089/1168/4744 [K410], 10121/90A1 [K450 ES] manual Troubleshooting Audio Problems

Models: 10120/90A0 [K450 NON-ES] 10121/90A1 [K450 ES] 10089/1168/4744 [K410] 10086/3109/4743 [K430] 10090/2556/4748 [K415]

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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 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.

Problem: No sound from headphones.

Troubleshooting and problem resolution:

•Check the headphone cable connection — ensure that the headphone cable is securely inserted into the headphone connector.

•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.

User Guide 33

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Lenovo 10089/1168/4744 [K410], 10121/90A1 [K450 ES], 10120/90A0 [K450 NON-ES] manual Troubleshooting Audio Problems

Contents

31503699 IdeaCentre K4 SeriesUser Guide Important Safety Information Page Using Windows ContentsImportant Safety Information Using the Rescue SystemAppendix Using the SoftwareHardware Replacement Guide Troubleshooting and Confirming SetupUser Guide Using the Computer HardwareThis chapter contains the following topics Front view of the chassis Rear view of the chassis IdeaCentre K4504 User Guide IdeaCentre K410 6 User Guide computer when you want to record sound or if you Basic connector instructionsUse this connector to attach a microphone to your Use this connector to attach headphones to yourConnecting your computer 5.1 Audio configuration instructions The configurations are as followings7.1 Audio configuration instructions Sound configuration is as followsConnecting the power cord Display connecting instructions when playing Blu-ray Discs Connecting to the InternetWired keyboard selected models only Components Hot-swappable hard disk selected models onlyUsing the hot-swappable hard disk Hot-swappable hard diskDo not install the operating system on the hot-swappable hard disk Power Control Switch selected models only To display the main screen of the software 18 User Guide AUTOCOOL TURBO 20 User Guide Using Windows This chapter contains the following topicsShutting down the computer Switching between the main Windows 8 interfacesThe Charms Bar 22 User GuideOpening other system programs Switching between appsClosing an app Windows Help and Support24 User Guide Using the Rescue System This chapter contains the following topicsNote about the service partition OneKey RecoveryMethod 2 Manual Installation Driver and Application InstallationMethod 1 Automatic Installation 28 User Guide User Guide Using the SoftwareThis chapter contains the following topic Registration Service and WarrantyLenovo Support User GuideThis chapter contains the following topic Troubleshooting and Confirming Setup Troubleshooting and Problem Resolution User GuideSolving Problems Troubleshooting Display ProblemsTroubleshooting Audio Problems 34 User Guide Troubleshooting Software ProblemsTroubleshooting Problems with Optical Drives and Hard Disks Special considerations for troubleshooting Windows 36 User Guide BIOS setup utilityWindows Help and Support Performing Daily Maintenance Tasks 38 User Guide  Identifying internal components Hardware Replacement GuideThis chapter contains the following topics  Removing the front bezelSafety information for replacing CRUs OverviewAdditional information resources Tools requiredHandling static-sensitive devices Hard disk drive LocationsIdentifying internal components User GuideIdentifying parts on the system board Lenovo K450Front panel connector Battery Lenovo K430Lenovo K410 46 User GuideLenovo K415 General information Pre-disassembly instructionsReplacing hardware Removing the computer cover To remove the computer coverRemoving the front bezel To remove the front bezelReplacing a memory module To replace a memory moduleSlot one or three Lenovo K415Slot four Slots one and two, three and four or one and threeReplacing a hard disk drive To replace a hard disk driveReplacing an optical drive To replace an optical driveReplacing a graphics card To replace a graphics cardc. Remove the screw that secures the graphics card to the chassis 56 User Guideb. Remove the screw that secures the graphics card to the chassis Replacing the TV-Tuner card To replace the TV-Tuner card7. Reattach the computer cover Replacing the keyboard and mouse To replace the keyboardAppendix DeclarationTrademarks Energy Star Statement Enabling ErP compliance mode