The 5 Most Common AV Failures at Live Events (And How to Prevent Them)

No one remembers the AV when it works perfectly.  Everyone remembers when it fails.

A screen going black during a CEO's keynote.  A microphone screeching with feedback during a panel.  The wrong slide appearing on the LED wall at a product launch. 

These moments are not just embarrassing.  They undermine the credibility of the event and everyone involved in organising it.

Most AV failures are preventable.  Here are the five most common ones and what to do about each.

1. LED Video Wall Blackout During a Session

The screen goes dark in the middle of a presentation.  The audience stares at a black rectangle.  The speaker does not know what happened.

This usually comes down to one of three things: a loose signal cable, a video processor overheating, or a power interruption to the LED controllers.

How to prevent it: test the full signal chain before the event.  Source device to processor to LED wall.  Run it for at least 30 minutes at full brightness.  Keep the video processor in a ventilated position. 

Use a UPS on critical systems so a brief power fluctuation does not kill the screen.  And always have a backup signal path ready.

2. Microphone Feedback During a Live Session

That sharp screech that makes everyone in the room wince.  It happens when the microphone picks up sound from the speakers and creates a loop.

Feedback is almost always a positioning problem. 

The speaker walks in front of the main speakers.  The stage monitor is angled toward the microphone.  The volume is pushed too high to compensate for a large room.

How to prevent it: place speakers ahead of the microphones, not behind them. 

Use directional microphones that reject sound from the sides.  Set up stage monitors at the correct angle.  And have a sound engineer managing levels in real time. 

Feedback can be caught and corrected in a fraction of a second if someone is watching.

3. Lighting Cues Firing at the Wrong Time

The award winner is announced.  The spotlight was supposed to hit the podium.  Instead, the stage goes into full colour wash mode.  The moment is lost.

Mis-timed lighting cues usually happen when the cue sheet is not synced with the program flow, or when the lighting operator is not clear on the sequence.

How to prevent it: create a detailed cue sheet that is shared between the lighting operator, the stage manager and the content operator. 

Rehearse the transitions.  If the event has an award ceremony or a product reveal, those specific cues should be practised multiple times.  The lighting team should know the program, not just the cue numbers.

4. Audio and Video Out of Sync

The speaker is talking but the words and the lip movement on the LED screen do not match. 

Or the presentation slide changes two seconds after the speaker references it. 

This looks amateur.

Sync issues happen when the video processing chain adds latency that the audio chain does not. 

The live camera feed goes through a switcher, a scaler and then the LED wall.  Each step adds a small delay. 

The audio goes directly from the microphone to the speakers with almost no delay.  The result is a visible gap.

How to prevent it: use a video processor that supports low-latency output.  Align the video and audio chains during testing. 

If the sync is off, add a small audio delay to match the video path.  This adjustment should be made during setup, not during the event.

5. Content Appearing Incorrectly on the LED Wall

The presentation was designed on a laptop.  It looks perfect on a 15-inch screen. 

On a 40-foot LED wall, the text is tiny, the colours are washed out and the bottom of the slide is cut off.

This happens when the content resolution does not match the LED wall resolution, or when the aspect ratio is different. 

A 16:9 presentation displayed on a screen that is 32:9 will either stretch or crop.

How to prevent it: confirm the LED wall resolution and aspect ratio before any content is created.  Design all screen content for the actual display, not for a laptop. 

Test every piece of content on the actual LED wall before the event.  What looks fine on a laptop may not look fine at scale.

The Common Thread

All five failures share one root cause: insufficient planning and testing before the event.

An experienced AV team tests every system, rehearses every cue and checks every piece of content on the actual screens before the first guest arrives.  The event audience should never be the first audience for a technical setup.

If you are planning a live event and want to make sure the AV works the way it should, talk to us.

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