Hitachi 60DX10B Service Manual page 46

6. No Sound
No Sound
Check
voltage at pin 9 of
I401
30V
Is audio signal
input at pins 1 and 30
of IA01?
No
Is audio signal
input at pins 52 and 54
of I201?
No
U101
0V or lower
Yes
Check the I C bus (SCL2, SDA2)
Yes
(1) Check the I C bus (SCL1, SDA1)
46
Check Power
Supply Circuit
IA01
2
I201
2