The sound went off in my livingroom TV with no warning and no obvious cause. I called a technician several times and was assured that he would contact me for an appointment to fix the problem, but by day 3 after my call I still had not heard from him, so I went to the internet and did some exploring.
Seems that one trick to try before involving the pros is to turn off the TV and the box from the cable company, then disconnect the main cable from both and wait for about 15 minutes. Plug everything back together and let the cable box reboot. Voila!! Sound appears and the problem is fixed.
I don't know how/why this fix worked, but I'm glad it did -- it certainly saved me some big bucks from a TV tech's visit.
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