Speaker/Receiver Trouble - LG LG9200 Service Manual

4. TROUBLE SHOOTING

4.1.3 Speaker/Receiver Trouble (1)

• Block Diagram
SPK_EN
Calypso
U102
RCV_N
IOTA
U101
RCV_P
U202
MAX4624
R209
C215
• Melody Generation
- U201(YMU788,MIDI) is controlled by
Calypso (DBB)
- U201 generates 64poly MIDI sound and it is
delivered to the speaker.
• Signals to the receiver
- RCV_P,RCV_N From IOTA (ABB).
- EAR_P,EAR_N to Receiver via B-to-B
Connector
Main Board
EAR_N
R292
C292
EAR_P
R291
C291 C293
Connector
SPKN
YMU788
Speaker
SPKP
U201
C217
CN201
- 46 -
Slide Board
CN301 CN901
FPCB
B-to-B B-to-B
Connector
• Check Points
- Audio signals from ABB
- Audio signals to the receiver
- Audio signal path
- Check the sound level to the speaker.
- Soldering of connector & speaker/receiver
- Speaker/Receiver
Receiver
EAR_N
EAR_P