Sound is out when you turn tv on.

This model uses a single "Surround/Sound" circuit board. All of them go bad---probably why he was using a surround sound system for the audio.

Board part number is: X480242 and it is no longer available from Hitachi---the only way you can get it fixed is to remove the board in the set and have it sent out for rebuild--company is PTS electronics--they repair/rebuild all kinds of boards.

Considering the cost for repair/rebuild is almost 200 dollars it may be smarter just to do what the other person did--get an inexpensive surround sound and get the audio that way.

I worked on a lot of these sets with this problem--some brand new ones were bad this way--

With the back off of the set you will see on the far left wall (as you look from the back) the Surround board--it is not hard to remove (several plugs and a few screws).

This was in my view a design flaw--the board is full of surface mounted IC chips and several are mounted near the audio output IC---heat from the output chip over time causes all kinds of bad solder connections.

I saw one tech in a shop where I worked spend three hours trying to resolder one of these boards (special soldering for surface mounted parts etc) and the board still did not work right.

That board got sent out for rebuild and worked fine after. Lots of these have problems where when cold or hot sound problems come or go.

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SD TECH