Philips HTD5540/12 Service Manual page 26

No output by Aux IN
No output by Aux in
Go
Check U361 pin1 ,12
Yes
Check U211 pin1 , 2
Yes
Check U211 I2S output
pin9 , 10,11,12
Yes
Replace Main board
5 - 7
No
Fix
Aux In
No
No
Replace U211
Trouble shooting chart
line to main board
Replace U5