Acer Aspire E1-471 Acer Aspire E1-431 and E1-471 Notebook Service Guide - Page 151

Internal Speaker Failure 0 If internal Speakers fail, perform the following: Start OK Check M/B SPK cable Check Logic Upper/Logic upper Re-assemble the NG SPK cable to M/B OK NG Swap Logic lower/Logic upper Swap M/B Figure 4-6. Internal Speaker Failure Sound Problems 0 Perform the following, one at a time. 1. Boot the computer. 2. Navigate to Start Control Panel System and Maintenance System Device Manager. 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 3. If updated recently, roll back the audio driver to the previous version. 4. Remove and reinstall the audio driver. 5. Make sure that all volume controls are set mid range: Troubleshooting 4-11