150
8575
8575
A N/B Maintenance
A N/B Maintenance
8.11 Audio Failure
No sound from speaker after audio driver is installed.
Test
OK?
Audio Failure
1. Check if speaker cables are connected
properly.
2. Make sure all the drivers are installed
properly.
1.Try another known good speaker,
CD-ROM.
2. Exchange another known good
charger board.
Re-test
OK?
Board-level
Troubleshooting
Replace
Motherboard
Yes
Correct it.
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.
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:
U14
U15
U16
VR1
L529
L28
L530
Q528
Q529
J24
Signals:
AOUT_R
AOUT_L
+3VS
5V_AMP
+3VS_SPD
SPK_OFF
SPDIFOUT
Parts:
U14
U15
J21
J28
C272
L531
L532
Signals:
+5VS
AVDDAD
MIC1
Parts:
U14
U15
J12
R187
R185
R186
Signals:
CDROM_LEFT
CDROM_RIGHT
CDROM_COMM
