Where do i purchase a hitachi surround circuit board for my HDTV (AP9X SURROUND P.W.B.)

Sounds (pardon the pun) like a audio circuit problem which is very rare in this set.

Check a few things--if using a cable box hook cable direct to set to rule the box out.

Also if you have a DVD player do you get sound that way?

Last and least likely in this case is in the menu for the set is there an option for the speakers to be turned off?

Failing all these--set has an audio problem and although a very good set may be too old and too expensive to fix for this problem.

It is POSSIBLE also that a surround sound unit could be purchased and with a cable box with audio outputs on back installed and BYPASS THIS PROBLEM--BOX WOULD PROVIDE AUDIO TO THE SURROUND SYSTEM AND IT WOULD HAVE ITS OWN SPEAKERS AND AUDIO CIRCUIT.

If set is Hitachi 60V500 and speakers are turned on, speakers are good and still no sound from internal speakers you have a audio circuit problem==this model is part of a class action lawsuit for another issue....

There is most likely an issue with the Surround PWB since you have the DP17 chassis. I would check the following items on the surround board. I have seen them all several times with the DP17

IT02 Shorted, pins 92 and 93 caused by Solder splash. IT02 Is also known to fail. Also pins 42, 43, & 44 have been known to have cracked solder
IT05 pins 20 & 21 shorted also Seems to have been caused by too much solder.

IS13, pins 1 & 2 shorted ( too much solder

Also check for cracked circuit trace patterns under IT05If you need further assistance let me know.

On your jack panel in the rear of the set look for the Audio Output Jacks. They will be Red and White. Just run the cables from there to your Aux Audio Input of your surround sound receiver.

If no sound in all input, check the surround board. Is the audio distorted or on and off before? if so replace surround board :)

the red green and blue are component video
to get the surround sound to work the red and white audio outputs from the tv go to the audio inputs on the reciever , and to get the digital surround sound the optical also has to be hooked up

On the back panel of your tv you will see two audio inputs labeled AUDIO TO HI-FI. Plug your surround sound audio jacks, ( red and white ) into that. Plug your video jack ( yellow ) into what ever number input you are going to use for dvd, if needed. This will allow you to watch tv and hear it in your surround sound. You should also go to menu- then- audio option and turn off your tv internal speakers, this will allow your tv remote to control your volume of surround sound. Hope this helped.

My mom and dad had this problem, after replacing the bulb everything is working great again.

There is an audio board that needs to be rebuilt or replaced as this is a common issue with these Hitachi's. It is the surround board.