Haier LE55B1381a Service Manual page 55

Service Manual
Model No.:
State: No Sound
N
N
Check
peripheral
audio
equipment:
Resetting
amplifier
power
supply
circuit
No sound
If there is anyaudio signal input
or Whether amplifier power supply
is normal?
Y
Check and repair
Check
amplifier power supply
external
circuit, if power supply
loudspeaker
is normal, then change U4
Y
Whether the volume,
MUTE
setting is normal?
signal output from J2?
Y
Check the
peripheral circuit
of U7, whether
software is correct?
- 53 -
Y
Whether there is
N
Whether there is signal
U4 TPA3110 3/12?
N
Check whether there is signal
output fromU7 audio input pin?
N
Check and repair
network
of the connecting
part between
U7 and U4
input in
Y