Mitac 8080 Service Manual - laptop schematics, notebook ...
Mitac 8080 Service Manual - laptop schematics, notebook ...
Mitac 8080 Service Manual - laptop schematics, notebook ...
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8.10 Audio Failure<br />
Audio Failure<br />
1. Check if speaker cables are<br />
connected properly.<br />
2. Make sure all the drivers are<br />
installed properly.<br />
Test<br />
OK?<br />
Re-test<br />
OK?<br />
No<br />
1.Try another known good<br />
speaker, CD-ROM.<br />
2. Exchange another known<br />
good charger board.<br />
No<br />
<strong>8080</strong> N/B Maintenance<br />
No sound from speaker after audio driver is installed.<br />
Yes<br />
Yes<br />
Correct it.<br />
Correct it.<br />
Board-level<br />
Troubleshooting<br />
Replace<br />
Motherboard<br />
Check the following parts for cold solder or one of the following parts on the<br />
motherboard may be defective,use an oscilloscope to check the following signal<br />
or replace parts one at a time and test after each replacement.<br />
1.If no sound cause<br />
of line out, check<br />
the following<br />
parts & signals:<br />
Parts:<br />
U3<br />
U509<br />
U511<br />
U18<br />
Q23<br />
Q26<br />
Q31<br />
L533<br />
L535<br />
L536<br />
L37<br />
L38<br />
Signals:<br />
AOUT_R<br />
AOUT_L<br />
DEVICE_DECT#<br />
SPDIFOUT<br />
DECT_HP#/OPT<br />
SPK_OFF<br />
2. If no sound cause<br />
of MIC, check<br />
the following<br />
parts & signals:<br />
Parts:<br />
U3<br />
U509<br />
J519<br />
L537<br />
L35<br />
Signals:<br />
H8_AVREF<br />
MIC<br />
3. If no sound cause<br />
of CD-ROM, check<br />
the following<br />
parts & signals:<br />
Parts:<br />
U3<br />
U509<br />
J509<br />
R309<br />
R302<br />
Signals:<br />
CDROM_LEFT<br />
CDROM_RIGHT<br />
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