Acer Aspire 7250 Acer Aspire 7250 Service Guide - Page 134

Internal & External Speaker Failure 0 If internal Speakers fail, perform the following, one at a time. Do not replace a non-defective FRU: START START Check MB SPK cable NG Reassemble the SPK cable to MB Check I/O Board Connection NG Reassemble I/O Board FPC Check SPK module NG Swap Reassemble The SPK module Check I/O Board OK? NG Swap I/O Board Swap MB Swap MB Figure 4-6. Internal Speaker Failure Sound Problems 0 Perform the following, one at a time. 1. Boot the computer. 2. Navigate to Startu Control Panelu System and Securityu Systemu 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 task bar 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