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The audio circuitry is located in the main board. Try unplugging the TV for a while and try again if the audio comes back.
I would suggest to check all your settings in the audio section first and if everything seems OK then the main board should be replaced.
Check the speaker/s first. If found OK, check and replace the audio output IC. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Be sure to check all connections on the rear. Are both channels bad? Also if it has preamp output or rec out, u can check to see if those work with a external amp of some kind. Good luck. Let me know if you need more suggestions.
i'm running os 10.5.6 w/ protools 8.0 and the original mbox. i had the same problem. protools opened and seemed to work except there was no sound from either analog outputs or headphones. this worked for me: 1. shut down computer 2. unplugged all usb cables except keyboard/mouse 3. restarted computer 4. re-plugged usb cable from computer to mbox 5. opened protools session 6. hit play and now i'm hearing sound and everything seems normal.
It sounds like the output transistors have failed.
Disconnect everything from the amp except for the B+, ground and remote and turn the amp on. If it goes into protect, the amp is in need of repair.
If you want to repair it yourself, email power acoustic for the schematic.