Samsung TX20C53X/XET Service Manual page 87

Troubleshooting
6-26 Audio Signal Missing in Play Mode (MONO MODE)
TV NICAM PART(Sound Block)
6-20
Check ICM301
pin75 : 5V
Yes
Check
ICM301 pin23,24
(IC CLK DATA)
Yes
Check ICM301
pin 1 : PB Audio Signal
(Small Signal)
Yes
Check ICM301
pin100 : PB audio signal
(Small Signal)
Yes
Check ICM301
pin96 : PB Audio
Signal
Yes
Check
ICM501 pin54
PB Audio signal
Yes
Check
ICM501 pin56,58
out put Audio
Yes
Check
No
Check PC 5V Line
No
Check VCR MICOM
(ICM601- pin27, 28)
No Check A/C Head and PB EQ
Block (AUDIO HEAD AZIMUTH)
No
Check CM301
No
Replace ICM301
No
Check RM510, RM511, CM528
No
Check ICM501 & Hi-Fi Block
Samsung Electronics