No sound from the speakers
No sound from the speakers
No
Is sound muting set?
No
Cancel muting then check
again.
Is the volume set to "0"?
Raise the volume then
check again.
Yes
Yes
Is it the only TV sound that
doesn't come out?
Is it only HDMI sound that
doesn't come out?
Is it only the FRONT
input sound that doesn't
come out?
No
No
Yes
Yes
Yes
Is a signal input to IC4401?
(pin 1), (pin 3)
Is a signal input to IC4801?
(pin 25), (pin 26)
Check the communications
around the FE (U4401 or
U4402) and between the
FE (U4401 or U4402) and
the microcomputer.
No
Yes
Is a signal input to IC4402?
(pin 7)
Check around IC4402 and
check the communications
between IC4402 and
the FE.
No
Yes
Is a signal output from
IC4402?
(pin 22), (pin 23)
Check the communications
around the IC4402 and
between the IC4402 and the
microcmputer.
Is a signals input to IC4801?
No
Yes
Is a signal input to IC4801?
(pin 19), (pin 20)
Check the communication
between IC4402 and IC4801.
Is a signal input to IC4801?
(pin 10), (pin 11)
No
Check the communication
between IC6405 and
IC4801.
No
Yes
Yes
Is the flexible cable between
CN4001 and CN7804
connected normal?
Connect Flexible cable,
then check again.
No
Yes
Is it the only input REAR
input analog sound that
doesn't come out?
No
No
Yes
Is a signal output from
IC6405?
(pin 7), (pin 8)
Yes
Yes
Yes
Is a signal output from
IC4801?
(pin 35), (pin 36)
Check around IC4801 and
check the communications
between IC4801 and the
microcomputer.
No
Check around IC6405 and
check the communication
between IC6405 and the
microcomputer.
Check the communication
between the jack and
IC4801.
Yes
No
Yes
Has the signal come to
CN7201?
(pin 13), (pin20)
Check the communication
between CN7201 and
IC4801.
No
Yes
Is a signal output from
CN4005?
(pin 35), (pin36)
Check the communication
between CN4005 and
CN1402.
No
Has the symptom been
settled when the system
cable is replaced?
The panel is defective.
No
Finishing troubleshooting
Yes
45