Before diving into schematics, it's crucial to understand the system's architecture. The Z-5500 is not a traditional home theater setup. All the amplification is housed inside the subwoofer enclosure. The satellites (front, rear, center) are passive speakers that receive their amplified signal directly from the subwoofer via standard speaker wire.
The Logitech Z5500 is one of the most legendary 5.1 surround sound systems ever created. However, many systems are left unusable due to a single points of failure: a damaged control pod, a cut serial cable, or a dead control unit.
Are you using a or an AV receiver as the audio source?
Ensure that Pin 13 is securely connected to the negative terminal of your power circuit to prevent line hum and pop noises.
This comprehensive guide provides the exclusive wiring diagrams and pinout configurations needed to repair, bypass, or customize your Logitech Z-5500 system. The Proprietary DB15 Interface
The subwoofer features standard spring-clip terminals on the back, color-coded for easy identification. White Spring Clip Right Front (R): Red Spring Clip Left Rear (SL): Blue Spring Clip Right Rear (SR): Grey Spring Clip Center (C): Green Spring Clip
VGA cables rarely follow a standard color code. You must test continuity with a multimeter.
Connect Pin 7 to a +5V source to wake the amplifier from standby.
To trick the subwoofer into turning on without the control pod, you must bridge the power supply pins to the control pins.
The system uses TDA-series amplifier chips (like the U6 and U7 TDA amps mentioned on Head-Fi.org ). These chips are often bootstrapped together to drive the subwoofer, where one chip handles the positive feed and another handles the negative.