Audio Failure; Audio Test Error - MiTAC 8050QMA Service Manual

8.10 Audio Test Error-1

No sound from speaker after audio driver is installed.

Audio Failure

1. Check if speaker cables are
connected properly.
2. Make sure all the drivers are
installed properly.
Yes
Test
OK?
No
Try another known good
speaker, CD-ROM.
Yes
Re-test
OK?
No
80 50QMA
80 50QMA
Board-level
Troubleshooting
Correct it.
Replace
Motherboard
Correct it.
N/B Maintenance
N/B Maintenance
Check the following parts for cold solder or one of the following parts on the
motherboard may be defective,use an oscilloscope to check the following signal
or replace parts one at a time and test after each replacement.
1.If no sound cause
of line out, check
the following
parts & signals:
Parts: Signals:
U517 AMP_RIGHT
U19 AMP_LEFT
U709 DEVICE_DECT
J509 DECT_HP#OPT
J7 SPDIFOUT
J3 SPK_OFF
L60 EAPD
L61 OPTIN#
Q48
L20
L18
L73
Q510
2. If no sound cause 3. If no sound cause
of MIC, check of CD-ROM, check
the following the following
parts & signals: parts & signals:
Parts: Signals: Parts:
U517 +5VS U709
U709 +3VS U517
U16 +VA J710
U17 MIC_VREF R420
MIC1 MIC1 R407
J720 MIC2 R438
J721 MIC_EXT R419
L71 R406
L74 R434
D4
L554
L543
L548
Signals:
CDROM_LEFT
CDROM_RIGHT
CDROM_COMM
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