Mp3 Link Does Not Work - Philips HTB5540D/12 Service Manual

MP3 Link does not work

MP3 Link does
not work
Go
Check voltage 5V at FB23 whether normal or
not
Yes
Check signal at XP9 PIN22: MP3_R PIN20:
MP3_L on front board whether normal or not
Yes
Check Main Board U18 74HC4052 PIN2,
PIN15 L/R signal input right or not
Yes
Check voltage at U18 PIN16 (6V), check
12V on Main Board whether normal or not
Yes
Check U18 74HC4052 whether broken
or not
Yes
Replace U18 74HC4052
5-9
No
Check Main Board U9
No
Check U21 U22 on front board
No
Check Main Board C361, C352, R352,
R458
No
Refer to Power Board CON501
Check Main Board power supply
No
circuit.
Trouble shooting Chart