Audio drops out at high volumes when the thermal protection circuit triggers to protect the class-D amplifier chips.
Look closely at the power supply side of the board. You will likely see chunks of dark brown or black crusty glue smeared over components. logitech z906 service manual hot
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If the unit is already opened, check for signs of heat damage, such as browned circuit boards or bulged capacitor tops. 2. The Voltage Regulator (U18/U19) Hot Issue In the realm of consumer electronics, few things
If you are not comfortable with soldering or mains voltage electronics (the subwoofer contains lethal voltages even when unplugged), take the unit to a local electronics repair shop and bring a printout of the service manual if you find it.