108
M722 N/B MAINTENANCE
M722 N/B MAINTENANCE
6.9 AUDIO FAILURE
No sound from speaker after audio driver is installed.
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 the parts one at a time and test after each replacement.
Parts
:
U510, U25
C592,C256
U24,VR501
C243, C237
C570, L582
L516, L515
J10, J9
Signals:
AOUT_R
AOUT_L
SPEAKER-
LINE-HP_RIGHT
LINE-HP_LEFT
SPK_OFF
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
:
U25, C562
L517, C600
C599, L29
MIC1, J11
L42, C277
Signals:
MIC1
Parts
:
U25, C563
C232, C239
J510
Signals:
CDROM_L
CDROM_R
CDROM_COMM
AUDIO DRIVE FAILURE
1. Check if speaker cables are connected
properly.
2. Make sure all the drivers are setting
properly.
Test
OK?
1.Try another known good
speaker, CD-ROM.
2. Exchange another known
good charger board.
Test
OK?
Replace M/B or go
into board-level
Troubleshooting.
End.
Board-level
Troubleshooting for
audio test error.
YES
NO
YES
NO