Samsung HCM653W Service Manual page 163

Block Diagrams
8-10 Sound Switching Block Diagram 1
8-10
Signal Processing
The first Sound Switching is performed at IC706:4052 IC,
the main micom is controlled by S-CON0/1, and then the
second Sound Switching is performed at MSP3452 Sound IC.
Note : The S-Video 1 sound is output only when Video 1
Sound is connected.
AV1 (SCART1) : PAL ONLY
AV2 (VIDEO1) : NT / PAL
AV3 (VIDEO2) : NT / PAL
AV4 (VIDEO3) : NT / PAL
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