Guide topics

Picture, sound & playback

Compare one picture, audio or connection condition at a time and interpret the result carefully.

80 focused articles. Examples are illustrative; applicability and primary references appear on each guide.

Audio Path

Check silence that occurs only when audio formats change

Silence confined to audio-format boundaries can be investigated separately from sound dropping during one uninterrupted passage.

Compare Bluetooth lip sync with a wired or internal audio route

Compare the same visible-and-audible event across routes before correcting a delay that may belong to Bluetooth output.

Compare direct-to-TV sound with receiver-path sound

When video works but sound does not, an intermediary bypass can test whether the longer audio/video path is required for the failure.

Compare optical and HDMI only within each route’s documented limits

A working optical comparison can locate an audio route problem while leaving format and control differences explicit.

Compare selected audio track with receiver input information

Read the actual received channel format before using quiet surround speakers as evidence of a fault.

Compare sync on the same route across two known clips

Compare two items on the same route to discover whether the sync complaint is item-specific.

Compare volume levelling with the received surround format

Compare perceived level consistency and actual received format together when using Roku volume modes.

Find sound routed to headphones instead of the intended speakers

Check whether sound has moved to a connected headphone route before treating silent TV speakers as absent audio.

Interpret a persistent Atmos label on a continuous audio connection

A persistent receiver label can describe the connection mode while the original programme audio remains different.

Record whether audio leads or lags before adjusting delay

Record whether the sound leads or follows the picture so the next timing adjustment has a defined purpose.

Separate a fixed lip-sync offset from growing drift

Measure the shape of the complaint over time before treating it as one fixed lip-sync offset.

Separate missing TV return audio from working receiver input audio

Working sound from a receiver-connected source does not by itself verify the television’s return-audio path.

Separate receiver upmixing from a multichannel source

Sound from several speakers can come from receiver processing even when the incoming reference has only two channels.

Test missing dialogue with a receiver channel check

Use a local centre-speaker test to investigate missing dialogue without assuming every spoken line must use that speaker.

Use a supported stereo PCM output as an audio-path test

A supported stereo PCM comparison can show whether silence depends on the current automatic audio-format path.

Use TV speakers to isolate an external-audio fault

Keeping the picture and item fixed while changing only the audio destination can localise an external-audio symptom.

Verify both ends of an ARC audio return path

An audio return path depends on the correct documented port at both ends, not merely any HDMI socket.

Verify left and right channel order with a known stereo reference

A reversed stereo image should be checked as channel order before changing left/right level balance.

Colour Hdr

Check HDR capability on the exact display input

Check the exact input’s documented capabilities when an expected HDR format is missing.

Check highlight loss with a known reference pattern

A known bright-detail reference can distinguish a local picture-control effect from an unsupported claim about the stream.

Check which display receives an HDR setting

Check that an HDR or colour adjustment targets the screen actually showing the video.

Compare an HDR output indicator with known content provenance

An HDR indicator is evidence about what the display detects; source provenance still needs its own evidence.

Compare dark-detail patterns before suspecting the stream

Record both ends of the signal-range pairing before trying to recover dark detail with arbitrary brightness changes.

Compare fixed HDR output with dynamic-range matching

A known SDR reference can help evaluate a fixed HDR output against a supported matched-range path.

Compare SDR brightness inside a Windows HDR desktop

An SDR image inside an HDR desktop can be compared using Windows’ relative SDR brightness control before changing the media itself.

Compare the same neutral image with colour-temperature automation paused

A warm cast that follows a system colour-temperature feature can be tested without altering the video file.

Connect a laptop brightness change to its power state

A sudden brightness change on unplugging can be tied to HDR policy by recording power and display state together.

Test HDR availability with an extended desktop

A missing HDR option can be compared between duplicate and extended desktop configurations.

Trace HDR availability through an AV receiver

Compare HDR availability directly and through the intermediary before changing the content or assuming the TV lacks support.

Use a neutral reference to test a colour cast

Compare a suspected tint across a neutral reference and unrelated screen content before blaming a single programme.

Controls

Compare a remote command with the device’s supported app control

An already working virtual remote provides an independent command path for comparing one physical-remote failure.

Compare volume response with an unobstructed IR path

An unobstructed pointing comparison can test a volume command without changing pairing, content or network settings.

Distinguish repeated input from delayed playback reaction

A menu-level test can show whether unwanted repeated actions occur even when video playback is paused.

Identify input switching that looks like an app closing

A TV changing inputs can look like the player app closed, so record which physical source remains selected.

Isolate unwanted HDMI control by reconnecting one device at a time

Reconnecting one supported HDMI device at a time can identify which addition triggers unwanted control behaviour.

Separate working navigation from failing TV volume control

Working app navigation and failing TV volume are separate command classes that can narrow a remote-control complaint.

Geometry

Check whether picture-size differences belong to one input

A framing difference between inputs may be retained screen configuration rather than different video quality.

Compare native and lower-resolution output using text

Compare an unchanged text reference at native and lower output resolution before blaming video softness on delivery quality.

Decide whether black bars preserve the whole picture

Compare visible picture area before deciding that black bars represent missing video.

Locate black borders added in two different stages

Black borders can arise at more than one sizing stage, so change one stage at a time.

Separate desktop scaling from video picture size

Larger desktop text and a larger video picture are different adjustments that should be compared separately.

Test overscan with a visible edge marker

An edge-marked reference can show whether picture margins disappear at the display boundary.

Use a round object to detect image stretching

A known circle or square can reveal stretching that faces and landscapes make difficult to judge.

Use cropped captions as a picture-boundary clue

Clipped lower text can be a clue to picture cropping when other markers disappear from the same edge.

Motion

Avoid treating a display refresh readout as the content frame rate

A display’s refresh readout describes the output timing and cannot by itself establish how many unique frames the programme contains.

Check whether interpolation creates moving-edge artifacts

Repeated halos or broken-looking edges around moving objects can be compared with the TV’s motion interpolation held off.

Check whether laptop refresh policy changes motion on battery

Check the actual refresh setting before attributing a power-state motion difference to the online video.

Compare a moving object with its paused frame

Inspecting the same moving object paused and playing helps describe whether softness exists inside a frame or appears mainly in motion.

Compare a steady pan before and after frame-rate matching

A steady pan provides a repeatable reference for comparing fixed output with content frame-rate matching.

Compare a supported low-latency picture mode with the viewing mode

Compare response timing using a supported low-latency mode while keeping picture-quality preference as a separate decision.

Compare playback on one monitor with a two-monitor desktop

A single-display comparison can show whether a motion problem requires the current multi-monitor arrangement.

Compare supported 50 Hz and 60 Hz output for a known 50 fps clip

Known 50 fps motion is a useful reference for a supported output-rate comparison, provided the source rate is verified.

Compare switching delay only when QMS prerequisites are met

QMS should be compared only on a chain that documents support, with frame-rate transitions separated from dynamic-range changes.

Separate a motion hitch from a playback stall

Record whether playback time continues through an uneven pan before calling the event a buffering pause.

Picture Path

Check a laptop video path with its dock removed

Removing a dock can reveal whether a display failure requires the accessory stage to be present.

Collect useful evidence from an explicit HDCP error

An explicit HDCP message is more useful than a general black-screen label when comparing a supported output path.

Compare a lower supported output mode with an unstable higher mode

A stable lower mode can narrow an intermittent output problem without proving that the source video itself has changed.

Compare a screenshot with the visible display fault

A screenshot and a photograph answer different questions about where a visible defect may enter the picture.

Compare two TV HDMI inputs without changing the source

Changing only the display input helps test whether a failure belongs to one port or its retained configuration.

Distinguish random display sparkles from repeatable source defects

Record whether a mark follows the content position or appears unpredictably before deciding which path to test.

Recognise a format-change blackout at playback boundaries

A brief blank screen exactly when playback starts or stops can belong to a display-format transition.

Separate a missing HDMI signal from black video

A black screen becomes easier to investigate when you first record whether the TV still recognises an active input.

Swap one HDMI cable while preserving the rest of the chain

A cable swap is informative when the cable is the only planned change and the failure can be repeated.

Test an HDMI picture path with the receiver bypassed

A temporary direct connection can show whether a picture failure requires an intermediary to be in the chain.

Use a second source to test a suspect display input

A second source can test the display side of a picture fault while preserving the input and supported output mode.

Use the monitor self-test as a boundary check

A monitor-generated test helps decide whether a visible defect remains when the external video source is removed from the test.