LG CE110 Service Manual page 81

4. TROUBLE SHOOTING
z Speaker Part
U200
SPK_AMP
U201
ANA_SW IC
z Receiver Part
Receiver Trouble Shooting Setup
z Initialize GSM MS test equipment.
z Connect PIF-UNION and power on.
z Make a test call to 112.
z Set audio part at test equipment as PRBS or continuous wave, not echo.
z Set the audio volume max.
Trouble shooting Procedure
z Check the audio signal levels at each point.
z Check the soldering of the connector.
z Check the soldering of the receiver.
z Check the receiver.
z Check receiver cable states.
Speaker Trouble Shooting Setup
z Connect PIF to the phone, and power on.
z Enter the engineering mode, and go to menu
"Baseband -> Alert -> Ring"
Trouble Shooting Procedure
z Check the voltage levels of power supplies.
z Check all sound path.
z Check the sound level to the speaker.
z Check the speaker and the soldering.
LGE Internal Use Only
U201
ANA_SW IC
Main 60 Pin
connentor
- 82 -
LCD Connector
FPCB 60 Pin
SPK/RCV
connentor
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