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By Pro-Logic Technologies
There are few more alarming moments for an audio enthusiast than pressing play, turning up the volume, and hearing nothing at all. A no-sound fault can have many causes — from something as simple as a muted input or a disconnected cable to something as serious as a failed amplifier output stage. Pro-Logic Technologies provides expert no-sound fault diagnosis and repair services across Nairobi, systematically identifying the cause of complete audio failure and restoring your system to full operation.
Starting with the Basics
Before assuming a hardware fault, Pro-Logic Technologies always begins with a systematic check of the basics — not because we assume the client is at fault, but because the most straightforward causes are always worth eliminating first:
Is the correct input selected on the amplifier or receiver? Is the volume above minimum? Is the mute function active? Are all cables correctly seated and connected? Is the amplifier in protection mode? Are all power supplies on and functioning? Is the source device outputting a signal?
These checks can be completed quickly and occasionally reveal that the fault is not a hardware issue at all — which saves the client the time and expense of a workshop repair.
Amplifier and Receiver No-Sound Faults
If the basics are ruled out, the investigation moves to the electronics. Protection mode is one of the most common causes of no sound from an AV receiver or amplifier. When the receiver's protection circuit detects a fault condition, it mutes the outputs to prevent damage to the speakers. The receiver powers up, the display lights, but no audio passes. We read any fault codes displayed, disable the protection circuit temporarily under controlled conditions to identify the fault, and carry out the necessary repair.
Failed output relay — the output relay in an integrated amplifier disconnects the speakers during power-up and power-down to prevent thumps, and reconnects them when the circuit stabilises. A failed or corroded relay can leave the speakers disconnected permanently. Relay replacement restores normal operation.
Blown internal fuse — a blown rail fuse or speaker output fuse cuts the supply to the output stage, causing total silence. We identify and replace the fuse, and investigate any underlying fault that caused it to blow.
Failed preamplifier or source stage — if the power amplifier stage is functioning but the preamplifier is not passing signal, no sound will result despite the speakers and amplifier being undamaged. We inject a test signal at the power amplifier input to determine where in the chain the signal is lost.
Speaker-Side No-Sound Faults
Occasionally, the no-sound fault lies not in the amplifier but in the speakers themselves. Open-circuit speaker cables, corroded binding posts, blown driver voice coils, or open-circuit crossover components can all cause complete loss of output. We check speaker continuity and impedance as part of a thorough no-sound investigation.
Digital and Streaming No-Sound Faults
On modern systems, no-sound faults can also originate from digital configuration issues — incorrect audio format settings, mismatched HDMI ARC configurations, sample rate conflicts, or software faults in network streamers. Our engineers are experienced in diagnosing both hardware and software/firmware causes of no-sound conditions.
Contact Pro-Logic Technologies for professional no-sound fault diagnosis and repair in Nairobi.