7521Plus / N N/B MAINTENANCE
8.10 AUDIO FAILURE
No sound from speaker after audio driver is installed.
AUDIO DRIVE FAILURE | |
| Troubleshooting for |
| audio test error. |
1.Check if speaker cables are connected properly.
2.Make sure all the drivers are installed properly.
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.
YES | Test |
| |
| OK? |
NO
1.Try another known good speaker,
2.Exchange another known good charger board.
YES
End. | Test | |
OK? | ||
| ||
| NO |
Replace M/B or go
into board-level Troubleshooting.
1.If no sound cause of line out, check the following parts & signals:
Parts: | Signals: |
U5, C52 | AOUT_R |
U6, C65 | AOUT_L |
VR501 | ROUT+ |
C81, C80 | ROUT- |
C71, C62 | LOUT+ |
R52, R49 | LOUT- |
R45, R31 | SPK_OFF |
R64, R61 |
|
R34, R33
Charge BD
2.If no sound cause of MIC, check the following parts & signals:
Parts: Signals:
U5, C61 MIC1
L506, L505
C75, J509
J4, L13, L10
R41, R42
C39, R50
D2, U4
3.If no sound cause of
Parts: Signals:
U5, C63 CDROM_LEFT C73, C64 CDROM_RIGHT
J512 CDROM_GND
