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My Technics SA-AX540 Surround sound feature has no sound. I heard a massive pop while playing a game on PS4 while using it and the sound just went dead. it works fine on 4.0/2.0 stereo.
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It is unlikely that the display itself is faulty although it can happen. The typical problem is either the backlight is defective or the suply to the unit has a bad connection. If you can solder, try resoldering the pins on the display itself. The pins on the ends are the power and ground. I don't recall whether or not your model has a separate back light bulb or not. That too could be burned. Chack for that too.
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