Why does the audio delay only appear with a soundbar?

The soundbar adds its own processing latency (DSP effects, format decoding) that the TV cannot automatically compensate for. Try disabling the soundbar audio effects, or switch to eARC if both devices support it — eARC provides tighter synchronisation.

What is ARC vs eARC and what is the difference?

ARC (Audio Return Channel) supports compressed formats up to 5.1 Dolby Digital, while eARC (enhanced ARC) can carry uncompressed 7.1 PCM and Dolby Atmos with considerably lower latency. If your TV and soundbar both support eARC, switch to it.

Can disabling CEC cause other problems?

With CEC off you lose automatic power-on and shared remote control, but the audio path becomes more stable. Try disabling CEC as a test — if the delay disappears, the problem was a CEC conflict.

How much does an audio sync repair cost?

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

What warranty do you give on audio sync repairs?

All audio synchronisation repairs carry a 3-month warranty on labour and parts. If the problem recurs within the warranty period we redo the work at no charge.

TV audio out of sync or delayed — repair in Riga

If your TV audio noticeably lags behind the picture, comes with an echo or does not match lip movements, the problem often traces back to the HDMI ARC/eARC link, soundbar settings or the mainboard audio processing chain. At the SATER service centre on Silmaču iela 6 we have been solving TV audio synchronisation issues across all brands since 1993.

3-month warranty

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Audio-video synchronisation in a modern television is a surprisingly complex process. When a picture arrives from an HDMI source (set-top box, games console), the TV SoC processes it through the video pipeline — scaling, HDR tone-mapping, motion interpolation — and each step adds latency. Meanwhile the audio signal can travel several routes: the internal DAC and amplifier, an HDMI ARC/eARC output to a soundbar, an optical SPDIF output, or Bluetooth. Each route introduces a different delay — HDMI eARC is typically under 20 ms, Bluetooth aptX can reach 40–80 ms, and the standard SBC codec up to 200 ms. If the TV audio DSP does not correctly compensate for these differences, or the CEC protocol conflicts between devices, the result is an audible mismatch between lip movement and sound. Sometimes the culprit is the mainboard audio DAC (digital-to-analogue converter) whose timing is off — the output signal is generated with a floating phase offset. We diagnose with an oscilloscope and audio analyser, pinpoint the exact source of the delay and carry out a repair or configuration correction. We always agree a firm estimate before any work begins. The unit must be brought in person during opening hours.

Likely causes

HDMI ARC/eARC handshake failure — The TV and soundbar cannot correctly negotiate the audio format and synchronisation over the ARC channel — the result is sound lagging 100–500 ms behind the picture or dropping out entirely.
Audio processing delay in soundbar passthrough — The soundbar applies its own audio processing (virtual surround, EQ) that adds significant latency, and the TV does not compensate for it.
CEC conflict between devices — Multiple HDMI devices send conflicting CEC command signals, causing the audio path to switch or the synchronisation to become unstable.
Main board audio DAC timing error — The digital-to-analogue converter (DAC) IC on the mainboard generates the output signal with a floating phase offset, creating inconsistent audio delay.
Firmware bug in audio pipeline — A software bug in the audio processing chain — the DSP miscalculates the lip-sync compensation or the audio buffer size changed after an update.

What you can check yourself

Check the HDMI ARC/eARC connection between the TV and soundbar — use only the HDMI port labelled ARC and a certified High Speed HDMI cable.
Disable soundbar audio processing effects (virtual surround, night mode) and check whether the delay decreases.
In the TV settings find the Audio Delay / Lip Sync option and manually adjust the value until sound matches the picture.
Disable CEC (Anynet+, SIMPLINK, BRAVIA Sync) on all HDMI devices and check whether the conflict disappears.
Update the TV and soundbar firmware to the latest version — manufacturers frequently fix ARC sync bugs in updates.

When to bring it in

If after these checks the audio delay persists or fluctuates erratically, the problem may be hardware-level. We use an oscilloscope and audio analyser to trace the signal path from the HDMI input through the DSP to the DAC output, pinpoint the exact source of the delay and carry out a repair — whether that is a DAC IC replacement, DSP reprogramming or mainboard signal path restoration. All work carries a 3-month warranty. Bring the TV to Silmaču iela 6.

Fast on-site diagnostics. Repair warranty: 3 months.

Affected brands

Samsung LG Sony Philips TCL Hisense Panasonic

Frequently asked questions

Why customers choose SATER

From CRT to the latest Smart TVs. We repair televisions of every era — from tube sets to OLED and QLED.
LED backlight diagnostics on a professional test rig. We pinpoint the faulty LED strip without replacing the entire panel.
Samsung, LG, Sony parts in stock. Power boards, T-Con boards, LED drivers — key components always on the shelf.
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.