A3 Audio Trouble
No sound
(VWDEOLVKHG
GDWH
5HYLVHGGDWH
/('79
(UURU
V\PSWRP
6WDQGDUG5HSDLU3URFHVV
6
12
31
5/1
0
5
ǃ
ǃ
Audio Trouble
˄
No sound)
No sound
Check the AMP power
Check the power supply circuit
Y
Check if PIN24 &PIN31 of the AMP
chip voltage is normal
Check the control circuit
Check the input signal
Check the circuit from AMP to the jack
Check the output signal
Check the circuit from U1
to AMP
Check the circuit between output jack
and AMP chip, Change AMP chip
N
N
N
N
Y
Y
Y
Copyright
ⓒ
2017 LG Electronics Inc. All rights reserved.
Only training and service purposes.
Copyright
ⓒ
2017 LG Electronics Inc. All rights reserved.
Only training and service purposes.
Summary of Contents for 28LJ400B
Page 38: ......
