Philips HTS3538 Service Manual page 40

AUX in does not work
AUX in does not
work
Check voltage at U12 PIN8:12V on Main
Board whether normal or not
Yes
Check Main Board U5 PIN2,PIN15 signal
input whether right or not
Yes
Check voltage at U5 74HC4052 PIN16,
+6V, on Main Board
Whether normal or not
Yes
Check U5
Or not
broken
Yes
Replace U5 74HC4052
Go
74HC4052 whether
5-8
No
Refer to Power Board CN502
No
Check C166,C167,R87,R91
Check Main Board U1 power
No
supply and out circuit
No
Check Main Board U1
Trouble shooting Chart