Speaker/Receiver Trouble - LG T5100 Service Manual

3. BASEBAND PART TROUBLE SHOOTING

3.7 Speaker/Receiver Trouble

Melody Generation
- U300(YMU762:MIDI IC) is controlled by DBB(Calypso)
- U300 generates 40-poly MIDI sound and it is delivered to U301(TLV320AIC23BGQE:Ext-Audio
Codec)
- U301(controlled by Calypso) operates filtering and amplifying the delivered MIDI sound and outputs
these signals to Analog switch IC(U707).
- U302(TPA2005D1GQYR) makes the mixed input signal to differential amplified audio signal
- These signals are finally delivered to speaker through the camera connector and receiver through
the LCD connector
Signal to Receiver
- RCV_P, RCV_N from ABB(IOTA)
- RCV_P, RCV_N are delivered to Receiver in LCD module through LCD connector
Receiver Trouble shooting setup
- Initialize GSM MS Test equipment
- Connect PIF-UNION Jig and Power on
- Make a test call to 112
- Set audio part at test equipment as PBRS or continuous wave, not echo
- Set the audio volume Max
Figure 28. Speaker/Receiver Trouble
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