LG MG180C Service Manual page 53

4. TROUBLE SHOOTING
Speaker Part
Receiver Part
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.
• Check receiver cable states.
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.
U201
U200
Receiver
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SPEAKER