: A shorted speaker cable often causes a cascade failure of output transistors. Always replace the driver transistors and emitter resistors alongside the main BJTs.
Bias circuit, input differential pair, faulty limiter circuit. Filter capacitors (Power Supply), Ground loop. Component Inspection nx audio rx 4000 circuit diagram
If you are struggling with a specific issue, I can help you: on the board Provide typical voltage readings for the power supply Explain how to bridge the amplifier safely : A shorted speaker cable often causes a