SOURCE: i have a samsung ht-tx75 and it keeps shutting
Protection is very likely caused by an over heat condition, even with the fan working if the receiver is in a very enclosed place that warms up and is not ventilated it will cause the problem. The solution is to provide more ventilation so that the receiver can cool itself properly.
SOURCE: my samsung ht-tx75 home theater
It sounds like you have either a thermal problem , or an electronic component fault in the power amp section. If the protection circuit is being activated, which disconnects the speakers so you have no sound, this is like to be the problem. Unless you are a trained technician, you should take it to a repair center. If the repair estimate is larger than you are prepared to pay (unlikely, unless it is a snobby shop) you have to decide whether to replace it with a new or used one.
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