How much does it cost to repair an amplifier with no sound?

We only quote a firm price after diagnostics — it depends on the specific fault and parts availability. We agree the estimate before work begins, and if you decide not to proceed the unit goes back with no obligation.

Can I replace the relay myself?

In theory yes, but in practice you need a soldering station, the correct relay rated for the current and voltage, and a check of the output stage — if the relay burned because of DC on the output, replacing it without fixing the root cause will result in another failure.

Do you repair valve (tube) amplifiers?

Yes, we work with both solid-state and valve amplifiers. For valve units we source tubes, test output transformers and set the bias current.

What warranty do you give on the repair?

All audio equipment repairs come with a 3-month warranty on labour and parts. If the same symptom returns within the warranty period we redo the work at no cost.

How long does an amplifier repair take?

With parts in stock, 2–5 working days. If specific transistors or relays need to be ordered, the time can extend to 7–14 days. We give you an estimated timeline before starting work.

Amplifier or receiver produces no sound — repair in Riga

If your amplifier or AV receiver powers up, the display lights up, but there is dead silence from the speakers, the cause is almost always hardware. The SATER service centre on Silmaču iela 6 in Riga has been repairing audio equipment of every brand for over 30 years, since 1993.

3-month warranty

+371 29 547 002 +371 67 377 002 WhatsApp

No sound from an amplifier is one of the most common symptoms we see from Hi-Fi and home-theatre owners. Behind this simple description lie very different faults: from an oxidised output-stage relay to fully blown output transistors placing DC on the speaker terminals. In a classic integrated amplifier or stereo receiver the audio signal passes through an input selector, preamplifier section, tone controls, volume potentiometer and the power amplifier output stage before it reaches the speaker binding posts. At every one of these stages there are components whose failure results in silence: coupling electrolytic capacitors, differential-pair transistors, op-amp ICs (NE5532, OPA2134, LM4562), protection relays by Omron, Takamisawa or Fujitsu, and the output pairs themselves (2SC5200/2SA1943, MJL3281/MJL1302, or MOSFET IRFP240/IRFP9240). In AV receivers you add a DSP processor, HDMI switching and Dolby/DTS decoders, any of which can block the audio stream. We run full bench diagnostics, scope the signal at every stage of the chain and give you a firm estimate before any work starts. If you decide not to proceed the unit goes back with no obligation. There is no mail-in service — the equipment must be brought in person to our centre at Silmaču iela 6 during working hours.

Likely causes

Speaker relay oxidation or failure — The speaker protection relay (Omron G2R, Takamisawa, Fujitsu) oxidises over time — contacts stop passing signal even though the relay clicks. Typical sign: the relay engages after 2–3 seconds but there is no sound.
Output transistors blown (DC on output) — The output pair (2SC5200/2SA1943 or equivalents) has shorted, placing DC voltage on the output, and the protection circuit locks out the speakers.
Protection circuit triggered by overload or short — The protection circuit has detected DC on the output, an overload or overcurrent condition and has latched the relay open — the amplifier powers on but stays silent.
Dried-out electrolytic capacitors in the signal path — Coupling capacitors between stages lose capacitance with age, blocking signal flow. Especially common in equipment older than 15–20 years.
Loose or oxidised speaker terminal connections — The speaker wire does not make reliable contact in the spring-clip or binding-post terminals — visually connected but the circuit is open.

What you can check yourself

Check the cables from the amplifier to the speakers — disconnect and reconnect, making sure you have a tight fit in the terminals.
Try the headphone output — if you get sound there, the problem is in the output stage or relay.
Connect a different source (phone via AUX) to rule out the player being at fault.
Look for a Protection/Protect LED — if it is flashing or lit, the protection circuit has tripped.
Unplug the unit from the mains for 30 minutes and power it back on — some protection circuits reset with a full power-down.

When to bring it in

If after checking cables and inputs there is still no sound, or the protection LED is lit, the amplifier needs bench diagnostics. We open the chassis, scope the signal path from input to output, measure the output stage bias and quiescent current, and test relays and capacitors. If the output transistors are blown we replace them as a matched pair with originals or proven equivalents. Relays are swapped for new Omron/Fujitsu units. Bring the unit to Silmaču iela 6.

Fast on-site diagnostics. Warranty: 3 months.

Affected brands

Yamaha Denon Marantz NAD Pioneer Sony Cambridge Audio TechnicsOnkyo

Frequently asked questions

Why customers choose SATER

Tube amplifier and Hi-Fi repair. We work with valve circuitry that most service centres no longer touch.
Vintage audio expertise since 1993. Radiotehnika, Technics, Marantz, Pioneer — we know this equipment from daily practice, not catalogues.
Turntable restoration. Belt replacement, tonearm adjustment, motor repair — we bring turntables back to life.
30+ years of experience. The service centre has been operating since 1993.
We serve all of Latvia. Our service centre is in Riga and we accept devices from anywhere in the country.