Direct answer
For the Samsung QN90D Neo QLED 4K TV, output selection, mute/volume, format and the external audio path should be isolated. First, test TV speakers with a built-in app and PCM/stereo output.
What this covers
- Samsung QN90D Neo QLED 4K TV (QN43/50/55/65/75/85QN90D*)
- Samsung TV; panel type, One Connect box, HDMI 2.1 ports, Tizen year and remote vary by model.
- The specific fault this record addresses: has picture but no sound
What it does not cover
- ×The same symptom on a different Samsung product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
Audio output is routed to a device that is off or disconnected
What separates it No sound from the TV speakers, with an external audio device selected in the sound settings.
How to confirm Set the output explicitly to the internal speakers as a test. If sound returns, the fault is in the external path rather than the set.
- 2
The audio format is one the connected device cannot decode
What separates it Silence on specific apps or sources — typically Dolby Atmos or DTS content — while others play normally.
How to confirm Set the output format to PCM or Stereo as a test. If sound returns, the format was the problem and the receiving device does not support what was being sent.
- 3
Bluetooth headphones are still connected
What separates it No sound from the speakers or the soundbar, with a pair of headphones powered on somewhere in the room.
How to confirm A television that auto-reconnects to previously paired headphones mutes its own output silently. Disconnect them in the Bluetooth settings.
- 4
The set is muted or volume is at zero on a second control
What separates it No sound with the volume apparently up, in a setup with more than one remote.
How to confirm Where a soundbar or receiver handles audio, the TV's own volume may be irrelevant and the other device muted.
- 5
The internal speakers or amplifier have failed
What separates it No sound from the internal speakers on any source and any format, while headphones or an external output work.
How to confirm This is the conclusion once routing, format and mute state are eliminated, and is a service repair.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether the internal speakers are explicitly selected as the audio output.
- Whether silence affects every source and app, or only specific ones — the latter points at audio format.
- Whether any Bluetooth headphones are paired and powered on nearby.
- Whether a soundbar or receiver is in the chain with its own separate volume and mute.
Set the audio output explicitly to the internal TV speakers
ReversibleThis separates a set with no sound from a set sending sound somewhere you are not listening.
Set the audio format to PCM or Stereo as a test
ReversibleIf sound returns, a surround format was being sent that the receiving device cannot decode.
Check for connected Bluetooth headphones and disconnect them
ReversibleA set that silently auto-reconnects to previously paired headphones mutes its own output with no indication.
Check mute and volume on every remote in the chain
ReversibleWith a soundbar or receiver present, the TV's own volume may not be the one that matters.
Confirm sound on a built-in app before blaming an external device
ReversibleA built-in app bypasses the whole HDMI chain and isolates the set itself.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- QN43/50/55/65/75/85QN90D*. Samsung TV; panel type, One Connect box, HDMI 2.1 ports, Tizen year and remote vary by model.
- Panel — Mini-LED LCD, not OLED
- Neo QLED is a Mini-LED LCD with Quantum Matrix local dimming. It has a backlight, so a faint halo/bloom around bright objects on a dark background and slightly raised blacks in a dark room are normal LCD behaviour, not a fault — the opposite diagnosis from an OLED. Larger QN90D sizes use a wide-angle (ADS) panel and smaller ones a VA panel, so viewing-angle and contrast differ by size.
- No Dolby Vision
- Like every Samsung TV, the QN90D does NOT support Dolby Vision. It plays HDR10, HDR10+ and HLG. A title that offers Dolby Vision will fall back to HDR10/HDR10+ here — that is by design, not a fault, and no setting or update adds Dolby Vision.
- Smart platform
- Tizen with Smart Hub and the Samsung Gaming Hub (cloud gaming). Update path is Settings › Support › Software Update; screen sharing is Smart View (Miracast) and AirPlay 2. webOS, Google TV and Roku steps do not apply.
- Gaming / HDMI
- Four HDMI 2.1 ports with 4K 144 Hz, VRR (FreeSync Premium Pro), ALLM and the Game Bar. Enable Game Mode for the input; the Game Bar shows the live refresh and VRR state, which is the fastest way to confirm whether 120/144 Hz actually engaged.
- Symptom boundary
- This record covers Samsung QN90D Neo QLED 4K TV when it has picture but no sound. A different symptom on the same hardware, or this symptom on a different Samsung product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Unplug for a burning smell, distortion accompanied by heat, or visible damage at the rear panel.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Samsung publishes this as "Samsung TV has very low or no audio". Covers a Samsung TV with picture but no sound or very low volume, including sound output and mute/receiver checks. Probed 2026-08-21: title-verified. What that article does not carry is the model boundary — it is written for a product line, and QN43/50/55/65/75/85QN90D* is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
Why won't Dolby Vision play on my Samsung QN90D?+
No Samsung TV supports Dolby Vision, including the QN90D — Samsung backs HDR10+ instead. The app detects the TV has no Dolby Vision and streams the HDR10 or HDR10+ version, which is why you see HDR10+ where another brand would show Dolby Vision. It is a deliberate format choice by Samsung, not a fault, and it cannot be enabled by any setting or update.
I see a glow around bright objects on my QN90D.+
That is backlight blooming, normal on a Mini-LED LCD like the Neo QLED. Unlike an OLED it lights the picture with a zoned backlight, so a bright object on black can show a faint halo. Local Dimming set to High tightens it; it is a characteristic of the panel technology, not a defect.
Sound works on some apps but not others.+
That pattern almost always means an audio format problem rather than a hardware one. The silent apps are likely sending Dolby Atmos or DTS that something in your chain cannot decode. Set the TV's audio output format to PCM or Stereo as a test — if sound returns, that confirms it.
The TV suddenly has no sound at all.+
Check whether a pair of Bluetooth headphones is powered on somewhere in the room. Televisions silently auto-reconnect to headphones they have paired with before, and when that happens the set mutes its own speakers with no on-screen indication at all.
Does this answer apply to every Samsung model?+
No. It is scoped to QN43/50/55/65/75/85QN90D*. Samsung TV; panel type, One Connect box, HDMI 2.1 ports, Tizen year and remote vary by model.
What should I record before troubleshooting no sound or audio?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing no sound, audio. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for electrical noise, heat, sparks or repeated receiver protection.
Answer for the exact device and software version shown above.