Sharp Aquos LC-60LE450U, Service Manual

Page: 22 / 45

Sharp LC-60LE450U/LC-60LE452U Service manual
22
5.3 Audio Troubleshooting
（
No Sound
）
OK
Check the signal between
CPU and amplifier IC
NG
OK
NG
Change U2
1. Repair the circuit between
CPU and amplifier IC
2. Change U2
Change or Debug
the Audio input
OK Check the Audio
input
NG
Check if it is
on Mute
OK
Turn off Mute
OK
Check J8 Audio output
NG
1.Check the connection of
.
speaker cables
2.Check the speakers
Check the voltage
(12V) of U2
NG
Repair the voltage (12V)
circuit of U2
OK
1. Check the voltage (12V) of Pin 15.16 of U2
2. Check the voltage (12V) of Pin 27.28 of U2
NG
3. Repair the circuit of Pin
15.16.27.28 of U2
4. Change U2