Toshiba Satellite L450 series, Руководство по обслуживанию

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2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
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Procedure 1: Audio source test
Procedure 2: Earphone test
Procedure 3: Connection check
Procedure 4: Replacement check
Procedure 1 Audio source test
Try different audio sources (e.g. an audio CD and digital music file) to determine whether the
fault is in the speaker system or not. If not all sources have sound problem, the problem is in
the source devices. If all have the same problem, continue with Procedure 2.
Procedure 2 Earphone test
Connect a set if earphones or external speakers. If these function correctly, go to Procedure 3.
If they do not function correctly, the system board may be defective or damaged. Replace it
with a new one.
Procedure 3 Connection check
Disassemble the computer following the steps described in Chapter 4, Replacement
Procedures and make sure the speaker cable is firmly connected to the audio board. If the
stereo speakers are still not functioning properly, go to Procedure 4.
Procedure 4 Replacement check
If the stereo speakers don't sound properly, the stereo speakers may be defective or damaged.
Replace them with new ones. If the stereo speakers still do not work properly, try replacing in
turn the audio board and system board.