Shivaki STV-26ALED3, Руководство по обслуживанию, Страница: 58 / 80

All Channels No Sound
4. Audio Trouble 4. Audio Troubleshooting
（ （
All Channels No Sound All Channels No Sound
） ）
Check Volume and MUTE
Settings are normal
N
Y
Check if
UA1 PIN1 3 10 12 19 20
Check if there is
signal on CN17
N
Y
N
N
UA1_PIN1,3,10,12,19,20 are
24V
Y
Check if the voltage of
UA1 PIN2 i hi h th 3V
Ch k if di
Y
UA1_PIN2 is higher than 3V
and the voltage of UA1_PIN4 is
lower than 0.3V
Check if surrounding
components of UA1 are
normal?
Y
N
Check
the
Check
R16 R18 R
Change UA1
Replace related components
N
Check if U1_PIN201,203
have signal output ？
N
Change U1
power
supply
circuit
Reset
Check
Speaker
R16,R18,R
A14 and
RA1
have signal output
Y
Check the circuit between U1_PIN201,203
and UA1_PIN5,6
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