LG 55G2 - 8. Trouble shooting - No Audio (all audio source)

8. Trouble shooting - No Audio (all audio source)
Check the TV Speaker Menu
(Menu -> Sound setting -> TV Speaker)
On
ok
ok
Check Output Signal
P5400 :1, 2, 3, 4 pin
Replace Audio AMP IC
IC5400
ok
No
Check Connector & P5400
Replace connector
If found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC5400 )
Power : 24V, 3.3V
No
Check BEAD & Regulator
L5400,L5401,L2304
Check LG1152 I2S Output
R543 ~ R545
No
Check signal line.
Or replace LG1152( IC100)
Check AUDIO_MASTER_CLK
R542
No
Replace LG1152( IC100)
or Main Board.
ok
Check AMP I2C Line
R5402,R5403
No
Check signal line.
Or replace LG1152( IC100)
Check AMP IC RESET / FAULT PIN (MUTE)
(low is mute , high is un-mute)
Check reset & mute signal line
No
ok
Copyright ⓒ 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only