Audio Trouble (No Sound) - Daewoo LX32L1 Series Service Manual

Hardware Trouble shooting
5-5)Audio Trouble(No sound)
N
N N
Check
peripheral
audio
equipment
Check the Check the
Reset R
speaker
No sound
Is there audio input signal
Check if the setting of volume
and MUTE are normal
Y
N
Check the circuit
from U12 from U12
to sU6 or U12 I/O
has been damaged
Y
Y
Check if CN22 has
output signal
Y
Check if the voltage of Check if the voltage of
U13-pin34≥2.5V
Check if U13-pin19,32
Y Y
Check if U13-pin11,12,39,40
have signal output
N Y
Check if the audio input signal
is normal:PC:U12-pin47,48
AV: U12-pin49,50 SCART: U12-55,56
U13 is
Check the circuit
damaged
from U13 to CN22
-11-
N
Check if the power supply of
U13/R2A15122FP –pin13 –pin14 >11V
Y
has signal input?
N N
Check if U12-pin64,65
has signal output?
Y
N
Check the
circuit
Y N
between
U12-pin64,65
Check if the
audio input
Change
from U13 is
U12
normal or U13
is damaged
N
Repair the
power
supply for l f
U13