Acer Aspire 1420P Series, Service Manual

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150 Chapter 4
Internal Speaker Failure
If the internal Speakers fail, perform the following actions one at a time to correct the problem. Do not replace
non-defective FRUs:
Sound Problems
If sound problems are experienced, perform the following actions one at a time to correct the problem.
1. Reboot 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. Roll back the audio driver to the previous version, if updated recently.
4. Remove and reinstall the audio driver.
5. Ensure that all volume controls are set mid range:
a. Click the volume icon on the taskbar and drag the slider to 50. Ensure that the volume is not muted.
b. Click Mixer to verify that other audio applications are set to 50 and not muted.
6. Navigate to Start
´
Control Panel
´
Hardware and Sound
´
Sound . Ensure that Speakers are selected
as the default audio device (green check mark).
NOTE: If Speakers does not show, right-click on the Playback tab and select Show Disabled Devices
(clear by default).
7. Select Speakers and click Configure to start Speaker Setup . Follow the onscreen prompts to configure
the speakers.
Start
Check M/B SPK
cable
Re-assemble the
SPK cable to M/B
OK
NG
Check Logic
Upper/Logic
upper
OK
Swap Logic
lower/Logic upper
OK
NG
Swap M/B
Start
Check M/B SPK
cable
Re-assemble the
SPK cable to M/B
OK
NG
Check Logic
Upper/Logic
upper
OK
Swap Logic
lower/Logic upper
OK
NG
Swap M/B