Hitachi 42HDF52A Service Manual page 14

No sound issue
Picture is diaplayed. But no sound
Take off the back cover and
check ifl wires of the speakers
terminals have been well
connected to the PCB-Main
and speakers ?
Yes
Are the voltages applied to
CN2①② of the power
supply unit?
Yes
Are the signals applied to
P23①②③④ of the
PBC-Main?
Yes
Are there signals on
the speaker terminals?
Yes
Speakers
No
No sound
No
No
No
PCB-Audio
①+15.5~16V ②GND
(CN2)
(P23) ①NC ②L
14
Check
Power supply unit
PCB-Main or PCB-I/O
PCB-Speaker
Connector
③GND ④R