Tip & How-To about Logitech Z-5500 Surround Sound Computer Speakers Thx Home Theater Audio
If there is no light on the control, check the mains fuse on the back of the woofer box, if blown, you may have an amplifier ic (tda7294) blown (there are 6 on the big board), replace the ic, if still no sound, mute may be blocked in on position, on small side board there is a transistor (2n4401) connected to a white wire going to the big board, replace the transistor (you may use a bc337)
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