Acer Aspire 7750Z Acer Aspire 7750, 7750G, 7750Z Notebook Service Guide - Page 132
Internal Speaker Failure, Sound Problems
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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 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: Click the volume icon on the taskbar Drag the slider to 50. Confirm that the volume is not muted. Click Mixer to verify that other audio applications are set to 50 and not muted. 4-10 Troubleshooting