How much does it cost to repair an amplifier that won't turn on?

The cost depends on the specific fault — from a fuse replacement to restoring the standby PSU. We give a firm estimate after diagnostics. We agree on the price before work begins; if you decide not to proceed, the unit goes back with no obligation.

Can I just replace the fuse myself?

If the fuse is accessible externally (in the IEC socket) you can inspect it. But if it has blown, replacing it without finding the root cause will almost certainly result in another blowout — the underlying fault needs to be found and fixed.

My Onkyo/Pioneer receiver flashes and won't start — what should I do?

A flashing indicator usually signals a tripped protection circuit. In Onkyo TX-NR and Pioneer VSX receivers this is often related to the HDMI board or output stage. Bench diagnostics are needed.

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 defect returns within the warranty period we redo the work at no cost.

How long does a power supply repair take?

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

Amplifier or receiver will not turn on

If your amplifier or AV receiver is completely dead — no indicator lights, no relay click, no response to the power button — the cause is most often in the power supply or protection circuitry. A truly dead unit is not the same as one that powers up but plays no sound: there the standby supply and microprocessor are alive and only the amplifier stage has failed; here even the primary circuit will not start.

3-month warranty

WhatsApp +371 29 547 002 +371 67 377 002

A completely dead amplifier or receiver is a symptom that can feel catastrophic, but in practice it is often resolved by replacing one or two components. Modern amplifiers and AV receivers use a two-stage power system: a low-power standby supply that runs continuously and powers the microprocessor and standby LED, and a main power transformer that engages only when the unit switches from standby to the on state. If even the standby LED is dark, the problem lies in the primary circuit: a blown mains fuse (often from a power surge or lightning strike), a failed bridge rectifier, dried-out filter capacitors in the standby PSU, or a faulty PWM controller IC (TNY268, FSDL0165R or equivalent). Less obvious culprits include a chafed mains lead at the chassis entry and a one-shot thermal fuse on the transformer that has latched open after an overheat event. If the standby LED is lit but the unit will not transition to the on state when you press the button, the issue may be a latched protection circuit (remembering a previous overload or output short), a failed relay driver board, or a worn-out power button microswitch. In Onkyo and Pioneer AV receivers of the TX-NR/VSX series there is a well-known issue where the HDMI board fails and prevents the unit from booting at all. We diagnose all these cases on the bench, check voltages at every stage of the power chain and agree on a firm estimate before any work starts. If you decide not to proceed, the unit goes back with no obligation.

Likely causes

Standby power supply failure (no standby LED) — The PWM controller (TNY268, FSDL0165R), bridge rectifier or filter capacitors in the standby PSU have failed — the unit is completely dead.
Main power transformer fuse blown — The fuse has blown from a power surge, lightning strike or internal short — replacing it without finding the root cause will result in another blowout.
Protection circuit latched (overload/short memory) — The protection circuit detected an output short or overload and has locked out power-on — sometimes resets with a 30-minute unplug, sometimes needs repair.
Transformer thermal fuse tripped — After a serious overheat event the one-shot thermal fuse opens permanently — the unit will not start until it is replaced, even if the original cause of the overheat is gone.
Relay driver board failure — The control IC or transistor that switches the main power relay has failed — standby works but the unit will not transition to the on state.
Power button microswitch worn out — The mechanical microswitch behind the power button is worn — the contact does not close on press, or only closes intermittently.

Try this first

Check whether the standby LED lights up — if it does not, the problem is in the primary power circuit.
Try unplugging the unit from the mains for 30 minutes and powering it back on — some protection circuits reset with a full power-down.
Check the outlet with another device to make sure mains power is present.
Make sure the power cable is firmly seated in the IEC socket on the rear panel.
If the IEC socket has a removable fuse holder (cylindrical, accessible without opening the case), inspect the fuse for continuity.

When to bring it in

If after a full power-down the unit still will not turn on, or the standby LED is lit but the power button does nothing — bench diagnostics are needed. We check voltages at every stage of the power chain, test the PWM controller, capacitors, fuses, relays and button. Failed components are replaced with originals or proven equivalents.

Fast on-site diagnostics. Warranty: 3 months.

Brands we repair

Yamaha Denon Marantz NAD Onkyo Pioneer Sony Technics Cambridge Audio

FAQ

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. Electronics service centre in Riga — we accept devices from anywhere in the country.