Video equipment will not turn on
If your DVD player, home cinema system or other video equipment does not respond to the power button at all, or powers on for a moment and immediately shuts off, the fault is usually the standby power supply, the main fuse, or failing capacitors. Bring the device in and we will open the power supply and show you which stage has failed.
Failure to turn on is one of the most common problems we encounter day to day. The root cause usually sits in the power supply — the standby section provides the 3.3V or 5V rail that keeps the microprocessor and IR receiver alive. If that section has failed, the device responds to neither the button nor the remote — it is effectively dead. The second common fault is the main line fuse: after a lightning strike or mains surge it blows, leaving the device completely without power. The third scenario is capacitor ageing — electrolytic capacitors in the power supply swell or lose capacitance after 5–8 years, and the supply can no longer deliver stable voltage. On home cinema systems with a built-in amplifier (Panasonic SC-BTT, Samsung HT-J, Sony DAV) the amplifier protection circuit can also trip — if one speaker channel is shorted or an output transistor has blown, the system refuses to start and the PROTECT indicator lights up. Yet another possibility is a faulty power button board — the button physically fails to send the signal to the main board. Bring the device in and we will identify the cause with no obligation.
Likely causes
- Standby power supply failure — The standby section on the SMPS board has failed — the small MOSFET or STR-type IC has burned out. The standby voltage (3.3V/5V) never reaches the microprocessor, so the device responds to neither the button nor the remote.
- Main fuse blown — After a lightning strike, mains surge or short circuit the main fuse (typically 2–5A) has blown. The device is completely dead — no standby LED, no reaction at all. The MOV varistor and bridge rectifier are often damaged at the same time.
- Power button board failure — The power button microswitch is worn out or the board solder has cracked. The button physically does not send a signal to the main board, so the device will not start even though the power supply is healthy.
- Capacitor failure (bulging/leaking) — Electrolytic capacitors in the power supply have swollen or started leaking after 5–8 years. The supply can no longer deliver stable voltage, and the device either will not start or powers on briefly then shuts off.
- Amplifier protection latched (home cinema) — On home cinema systems with a built-in 5.1 amplifier (Panasonic SC-BTT, Samsung HT-J, Sony DAV) — if a speaker channel is shorted or an output transistor has blown, the protection circuit prevents the system from starting and the PROTECT indicator lights up. The protection resistor in the emitter rail is often charred at the same time.
Try this first
- Try a different wall outlet and a different power cable — this rules out the simplest cause.
- Check whether the standby LED (usually red or orange) is lit — if not, the power supply is not working at all.
- Unplug the device from the mains for 5 minutes to fully discharge the capacitors, then try powering on with the button on the device itself, not the remote.
- On a home cinema, disconnect every speaker cable from the rear panel and try powering on — if the system starts without the speakers, one of the channels has a short.
- Listen for quiet clicks or ticking from the back of the device — this means the power supply is trying to start but tripping into protection.
When to bring it in
If the device still will not turn on after checking the cable and outlet, it is time to bring it to our service centre. We open the power supply, check the fuse, measure standby and main voltages with an oscilloscope, and pinpoint the exact fault location. Capacitor and fuse replacement is one of the fastest and most cost-effective repairs — often done in a single day. Before any work begins we agree the estimate; if you decline, the device goes back with no obligation. All work carries a 3-month warranty. The device must be brought in person; we do not offer shipping.
Fast on-site diagnostics. Warranty: 3 months.
Brands we repair
FAQ
Why customers choose SATER
- Projector repair — all types. DLP, LCD, LED projectors — from home cinema to professional installations.
- Analogue video equipment. VHS decks, video mixers, analogue CCTV systems — we repair what others won't take on.
- Component-level video board repair. We don't swap whole modules — we find and replace the faulty component on the board.
- 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.