Karaoke In Does Not Work - Philips HTB3510 Service Manual

Karaoke in does not work

Karaoke in does
not work
Go
Check signal
signal from front board normal or not
Yes
Check Main Board U18 74HC4052 PIN5,
PIN14 L/R signal input right or not
Yes
Check U18 74HC4052 whether broken
not
Yes
Replace U18
at XP15 PIN18:MIC_in
or
5-11
No
Refer to Main Board XP9
Check the cable between XP9 and XP15
No
No
Check Main Board U26
Trouble shooting Chart