MiTAC 8050QMA - Manual (Page 130)

129
80 80 50QMA 50QMA N/B Maintenance N/B Maintenance
8.10 Audio Test Error-1
No sound from speaker after audio driver is installed.
Re-test
OK?
Test
OK?
Audio Failure
1. Check if speaker cables are
connected properly.
2. Make sure all the drivers are
installed properly.
Try another known good
speaker, CD-ROM.
Board-level
Troubleshooting
Yes
Yes
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:
2. If no sound cause
of MIC, check
the following
parts & signals:
3. If no sound cause
of CD-ROM, check
the following
parts & signals:
No
No
Parts:
U517
U19
U709
J509
J7
J3
L60
L61
Q48
L20
L18
L73
Q510
Signals:
AMP_RIGHT
AMP_LEFT
DEVICE_DECT
DECT_HP#OPT
SPDIFOUT
SPK_OFF
EAPD
OPTIN#
Parts:
U517
U709
U16
U17
MIC1
J720
J721
L71
L74
D4
L554
L543
L548
Signals:
+5VS
+3VS
+VA
MIC_VREF
MIC1
MIC2
MIC_EXT
Parts:
U709
U517
J710
R420
R407
R438
R419
R406
R434
Signals:
CDROM_LEFT
CDROM_RIGHT
CDROM_COMM
Correct it.
Correct it.
Replace
Motherboard
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