LG LG9200 Service Manual page 47

4. TROUBLE SHOOTING
Speaker/Receiver Trouble (3)
• Receiver Trouble shooting setup
- Initialize GSM MS test equipment.
- Connect PIF-UNION and power on.
- Make a test call to 112.
- Set audio part at test equipment as PRBS
or continuous wave, not echo.
- Set the audio volume max.
• Trouble shooting Procedure
- Check the audio signal levels at each point.
- Check the soldering of the connector.
- Check the soldering of the receiver.
- Check the receiver.
• Speaker Trouble Shooting Setup
- Connect PIF to the phone, and power on.
- Enter the engineering mode, and go to
menu "Baseband -> Alert -> Ring"
• Trouble Shooting Procedure
- Check the voltage levels of power supplies.
- Check all sound path.
- Check the sound level to the speaker.
- Check the speaker and the soldering.
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