Samsung HCR4755WX/XAA Service Manual page 27

3-2 Repairing No Sound
Confirm that CN601 is inserted
Abnormal Check IC603 Output
Terminal Pins 2 and 4
Check IC603 Input Terminal Pin 3
Check IC603 Input Terminal Pin 5
Check IC603 Input Terminal Pin 7 and 11
Check IC601 Input Terminals
Samsung Electronics
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Normal
Abnormal
Insert the CN601 Connector
Check the Speakers
Check FD802S of the SUB Board
Check the Sound Mute Circuit
Check IC603
Troubleshooting
3-5