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8355 N/B MAINTENANCE
8355 N/B MAINTENANCE
157
Board-level
Troubleshooting
Correct it.
1. Check if speaker cables are connected
properly.
2. Make sure all the drivers are installed
properly.
Test
OK?
Audio Drive Failure
1.Try another known good speaker,
CD-ROM.
2. Exchange another known good
charger board.
Re-test
OK?
Replace
Motherboard
Yes
Correct it.
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.
Signals:
AOUT_R
AOUT_L
ROUT+
ROUT-
LOUT+
LOUT-
AC97_RST#
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:
Parts:
U518
C762
L526
L85
L25
L527
J18
MIC1
Signals:
MIC1
MIC_INT
MIC_EXT
Parts:
U20
U518
C771
C773
C772
R738
R741
R739
R773
R740
J530
Signals:
CDROM_L
CDROM_R
CDROM_GND
CDROM_LEFT
CDROM_RIGHT
CD_COMM
Parts:
U20
U518
U517
J4
J5
L505
L506
L508
L509
C83
C816
VR1
C392
C806
R771
R770
C810
C749
R730
R729
R765
R764
Symptom:
No sound from speaker after audio driver is installed.
8.15 Audio Failure