You sit down to watch the evening news and the presenter's face breaks into a mosaic of coloured blocks. The audio cuts in and out. The picture freezes, skips, and then catches up ten seconds later.
If this sounds familiar, you're dealing with TV pixelation, and it's one of the most common complaints among Australian free-to-air TV viewers.
The good news is that pixelation almost always has a fixable cause. Here's what's likely going wrong and what you can do about it.
📋 In This Guide You'll Learn
- ✅ Why digital TV pixelates instead of going fuzzy like analogue
- ✅ The most common causes of pixelation
- ✅ Step-by-step troubleshooting you can do yourself
What Causes Pixelation on Digital TV?
With analogue TV, a weak signal gave you a snowy, grainy picture, but you could still make out what was happening. Digital TV works differently.
The signal is either strong enough to produce a perfect picture, or it falls below the threshold and the image breaks apart into blocks.
This is called the "digital cliff." There's very little middle ground between perfect reception and unwatchable television. So when your picture starts pixelating, it means your signal has dropped to right around that cliff edge.
The Most Common Causes
Damaged or Deteriorating Antenna
If your antenna is more than 10 to 15 years old, there's a strong chance it's the source of your problems. Exposure to Australian sun, wind, rain, and salt air (if you're near the coast) takes a serious toll on antenna components over time.
Corroded elements, loose connections at the antenna head, and a deteriorating mounting bracket can all reduce signal capture.
Good to Know
Even if the antenna looks intact from the ground, the internal connections and element joints may have degraded significantly. A visual inspection from ground level isn't enough to rule out antenna deterioration.
Loose or Damaged Cabling
The coaxial cable running from your antenna to your TV is a common culprit. Over the years, cables can be damaged by weather exposure, rodents chewing through the outer sheath, or simple wear at connection points.
A loose F-type connector at the wall plate or behind your TV can cause intermittent pixelation that comes and goes unpredictably.
Check every visible cable connection in your setup. The cable should be firmly attached at both the wall outlet and the back of your TV or set-top box.
Antenna Misalignment
Your antenna needs to point directly at the broadcast tower that serves your area. Even a shift of a few degrees can cause significant signal loss.
High winds, storms, or even birds perching on the antenna can gradually move it out of alignment over time.
If your pixelation started after a storm or period of severe weather, antenna misalignment is the most probable cause.
4G and 5G Mobile Tower Interference
This is an increasingly common problem across Australia. Mobile phone towers broadcast on frequencies that sit close to the TV broadcast spectrum, and in some cases, the powerful mobile signals can overwhelm your TV antenna and receiver.
If you've noticed pixelation that started around the time a new mobile tower was installed in your area, or if your problems are worse during peak mobile usage hours, 4G or 5G interference is a likely cause.
The fix is usually a filter installed at the antenna that blocks mobile frequencies while letting TV signals through.
Faulty Splitter or Amplifier
If you have multiple TVs connected to one antenna, there's a splitter somewhere in your system dividing the signal between outlets. A faulty splitter can degrade signal quality to all connected TVs.
Similarly, if you have a signal amplifier (booster) installed, a failing amplifier can actually make reception worse than having no amplifier at all.
Common Mistake
Amplifiers can also cause problems if they're boosting unwanted interference signals along with the TV signal. If your pixelation started after an amplifier was installed, try bypassing it temporarily to see if reception improves.
Weather Conditions
Heavy rain, electrical storms, and extreme heat can all temporarily affect TV reception. Rain can scatter signal energy, while temperature inversions (common in warmer months) can cause distant broadcast signals to interfere with your local ones, a phenomenon called atmospheric ducting.
If your pixelation only occurs during severe weather and clears up afterward, your installation is probably fine. But if bad weather consistently causes problems while your neighbours seem unaffected, your antenna setup may be marginal and could benefit from an upgrade.
Overloaded Signal from a Booster
This one surprises a lot of people. If you're in a strong signal area and someone has installed a signal booster on your system, the amplified signal can actually overload your TV's tuner.
The result looks identical to a weak signal: pixelation, dropouts, and frozen frames. The solution is counterintuitive: remove or bypass the booster.
How to Troubleshoot Step by Step
Start with the simplest checks first:
Retune Your TV
Go into the settings menu and run a full channel scan. Broadcast frequencies occasionally change, and a retune picks up the current ones.
Check All Cable Connections
Make sure connections between your wall plate and TV are tight and free of corrosion.
Try a Different Cable
Try a different coaxial cable between the wall and your TV to rule out a faulty fly lead.
Bypass the Booster
If you have a signal booster, unplug it and see if reception improves.
Check with Neighbours
If they're having the same problems at the same time, it may be a broadcast issue rather than something specific to your home.
When to Call a Professional
If you've run through the basic checks and your TV is still pixelating, it's time to get a professional antenna technician to your home.
They'll bring a signal meter that can measure exact signal strength and quality at your antenna, at your wall outlet, and at your TV. This quickly pinpoints where the signal is being lost.
Common professional fixes include:
- →Replacing an old or damaged antenna
- →Realigning the antenna to the correct tower
- →Replacing deteriorated cabling with new quad-shield RG6 cable
- →Installing a 4G or 5G interference filter
- →Replacing a faulty splitter or amplifier
Most of these repairs are straightforward and can be completed in an hour or two.
Don't Put Up with Bad Reception
Pixelation isn't something you need to accept as normal. In the vast majority of locations across Australia, it's possible to achieve clean, reliable free-to-air TV reception on every channel.
If your picture is breaking up, something in your antenna system needs attention.
FAQ: TV Pixelation
Common questions about pixelating TV reception.