Hitachi LE55S606 Service Manual page 13

3). No Sound, Sound Failed (Loading Interrupt, Noise, Etc.)
First, confirm the connection of all connectors between Board's and speakers, then survey by following the flowchart
as shown below.
No Sound, Sound failed
(Loading interruption,
Occurred at only
Video input (CVBS)?
Voltage of
pin No.3 or 4 of CN701 on
Main Board is 12V?
Main Board or Speaker units
LE55S606/LE55T506/LE55T516/LE55U516
Noise, etc)
No
Yes
Main Board
Yes
Power Board
No
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