S
ervice M
a
nu
a
l
Model No.:
- 5
3
-
St
a
te: No Sound
No sound
If there is anyaudio signal input
or Whether amplifier power supply
is normal?
Check
peripheral
audio
equipment:
amplifier
power
supply
circuit
Whether there is signal
input in
U4
˄
TPA3110
˅
3/12?
N
Y
Y
N
Whether the volume,
MUTE
setting is normal?
Resetting
Whether there is
signal output from J2?
Y
N
Check
external
loudspeaker
Check and repair
amplifier power supply
circuit, if power supply
is normal, then change U4
Check whether there is signal
output fromU7 audio input pin?
N
Y
Y
Check and repair
network
of the connecting
part between
U7 and U4
Check the
peripheral circuit
of U7, whether
software is correct?
N
