LG NB3532A Service Manual page 22

RECEIVER BAR TROUBLESHOOTING
1-3. NO AUDIO OUTPUT
BD/ CD/ DVD disc or USB play
IC301
Pin112, 113 USB_IN signal
OK?
IC301
Pin69,70, 71, 74 PWM Signal
OK?
Check AMP IC output stage
and speaker terminal.
Portable function
IC304
Pin1, 2 PTB input signal
OK?
IC304
Pin 9,10,13 I2S output signal
OK?
Check AMP IC output stage
and speaker terminal.
YES
YES
YES
YES
YES
YES
NO
Check JK304 or replace.
NO
Check IC301 or replace.
NO
NO
3-9
Check JK303.
Check IC304.