Why is my TV picture pixelating? A diagnostic guide for Gippsland homes

The phone calls we get most often go something like: “The picture on Channel 7 keeps freezing and going blocky. The other channels are fine.” Or “All the TVs in the house used to work — now only the lounge one does.” Or simply “The picture’s gone weird.”

In every case the customer is convinced the TV is broken. It almost never is.

Pixelation is what happens when your TV doesn’t have enough clean digital signal to decode the picture properly. The signal is either weak, intermittent, or being interfered with — and the TV can either hide the problem (briefly), show it (pixelation, freezing, audio dropouts), or give up entirely (“No Signal”). Below is the diagnostic logic we use on a call-out, so you can rule a few things out before you call an electrician.

Step 1: Is it one TV or every TV?

If only one TV in the house is affected, the problem is somewhere between the wall plate and that TV. The antenna and the bulk of the distribution are fine.

Things to check:

• The cable from the wall to the TV. A cheap fly-lead can lose a surprising amount of signal. Swap it with one from another TV that works.
• Is anything plugged into the TV’s antenna input that wasn’t before? Surge protectors, splitters, signal boosters — anything in line can degrade signal as much as it helps.
• Has the TV been retuned recently? Auto-tune can pick up weaker repeater stations from another transmitter; manually re-tune to your local services only.

If only one TV is affected and none of the above fixes it, the wall plate itself or its short cable run might have failed. That’s a domestic-electrician job, usually a 20-minute fix.

Step 2: If every TV is affected — is it every channel?

If every TV has trouble on the same channels, the problem is upstream — antenna, amplifier, or distribution.

A useful detail: digital TV pixelates worst on the channels at the edges of the frequency band. In Australia that’s typically the higher-numbered channels. If your TV is fine on most channels but stutters on the higher ones, the antenna is most likely either misaligned or under-gain for your location.

If every channel pixelates on every TV, the issue is one of:

• Amplifier failed. Most distribution-amplifiers have a 7-10 year service life. After that the gain drops and noise creeps in. Replacing an amplifier is usually $200-400 in parts plus install time.
• Water in a connector. Roof-cavity joints get sweated on and salt-crystallised over years. Any connector outdoors that wasn’t sealed properly will eventually drip rust onto its inside.
• Splitter failed. Cheap two-way and four-way splitters degrade slowly. The 4-port splitter that fed your house for 15 years might now be eating 6dB instead of the 4dB it was rated for. Same outcome.

Step 3: Does it pixelate worse in bad weather?

This is one of the strongest clues. If the picture is fine on a still day and falls apart in a thunderstorm or strong wind, you have a marginal-signal situation. The antenna is right at the edge of pulling enough signal, and weather is pushing it over.

The fix is rarely “add an amplifier” — adding gain to a noisy signal just gives you a louder noisy signal. The fix is usually:

• Higher-gain antenna, or
• Taller mast, or
• Re-aiming the existing antenna so it has a clearer line to the transmitter.

In Gippsland the dominant TV transmitter is Mount Tassie, south of Traralgon. If your antenna is pointing at a hill, a row of tall trees that have grown over 15 years, or a new house up the road, no amount of amplifier-replacement will fix the underlying problem. The geometry has to change.

Step 4: Have you recently added a TV or a long cable run?

Every TV you add to a distribution system divides the available signal. Add a fourth TV and each of the four TVs gets roughly a quarter of what one TV was getting on its own. If the antenna was marginal to start with, the new TV will pixelate first — and the existing TVs will start to follow within a few weeks as conditions vary.

Same story with long cable runs. Every metre of coax loses a small amount of signal, and the cheap RG-59 that’s often used loses a lot more than RG-6 or RG-11. A 25 m run from the roof to a back-room TV through tired RG-59 will pixelate where the same TV next to the antenna would be fine.

The right fix is a properly designed distribution system — antenna, amplifier matched to the number of outputs, splitter sized for the run lengths, and quality cable for any new pull. Done once and forgotten about for ten years.

What you can rule out

• Streaming issues are not antenna issues. If Netflix or Foxtel-via-app stutters, the antenna is irrelevant — it’s a network problem. (We do that side of the work too.)
• A new TV usually isn’t worse than an old one. Modern digital tuners are if anything slightly more forgiving than 2010-era TVs.
• The signal isn’t “weaker because of the neighbour’s solar panels.” Solar PV doesn’t transmit on TV frequencies. The story you hear about that is wrong.

What it costs to fix

We’re transparent about pricing. During business hours (Mon-Fri 7am-5pm) a service call is $149 inc GST and includes the first 30 minutes of labour on site — usually enough to diagnose the issue with a signal meter and explain what’s actually wrong. After that we bill at $125/hour + GST in 30-minute blocks. Outside business hours it’s $195/hour + GST from when we leave our Sale warehouse.

Materials are quoted on site. As a rough guide:

• New domestic antenna install: a few hundred to around a thousand depending on antenna spec, mast height, cable runs and wall-plate work
• Amplifier replacement only: usually under $400 all-in
• Splitter and a single bad connector: closer to the minimum call-out fee

We fit Matchmaster antennas as standard — Australian-made, built for Australian conditions (salt air, wind, fringe-area signal). They cost slightly more than the cheap import gear at a hardware store and last about three times as long in Gippsland.

When to just call

If you’ve worked through this list and the picture is still pixelating, or if you’ve never had clean reception and want it sorted properly, book a job online or call us on 03 4130 5012. We service every town in Gippsland and most central-area jobs we can do same-day.