Logitech Z-5500 Schematic Diagram |link|

The TDA7294 DMOS audio amplifier IC is vulnerable to static shocks, overheating, and shorted speaker wires. : Positive supply voltage input. Pin 8 & Pin 15 (-VS) : Negative supply voltage input.

To understand the schematic, you must first understand that the Z-5500 is not just a "set of speakers"; it is an integrated amplifier system. The system consists of three main sections found within the large subwoofer cabinet: logitech z-5500 schematic diagram

Trace the Mute/Standby trace coming from the DB25/PID connector. When the system is "On," this line should shift voltage (usually to a positive DC voltage) to release the amplifier ICs from standby mode. If this voltage is missing, trace it backward into the control pod or check the small signal transistors on the amplifier board that act as switches. 3. One Specific Channel is Dead or Distorted The TDA7294 DMOS audio amplifier IC is vulnerable