Why Your TV Signal Keeps Dropping Out (and How to Fix It)

Few things are more annoying than a TV signal dropping out right at the good bit. One minute the picture’s fine, the next it’s frozen, pixelated or showing “No Signal”. If your TV signal keeps dropping out, there’s almost always a reason, and many causes are easy to fix.

Here are the most common causes of digital TV signal dropouts in Queensland homes, what you can check yourself, and when it’s time to call a technician.

Why digital TV drops out instead of getting “snowy”

Old analogue TV would get fuzzy when the signal weakened. Digital TV behaves differently: it either works perfectly or it breaks up. When the signal falls below a certain level, even briefly, the picture freezes, pixelates or disappears. That’s why a signal that’s only slightly too weak can cause frequent dropouts.

Common causes of a TV signal dropping out

A weak or borderline signal

If your signal is only just strong enough, small changes like wind, rain or a passing truck can tip it over the edge. This is common in fringe areas and in homes where hills or tall trees partially block the path to the transmitter.

Damaged or ageing cables and connectors

Queensland’s heat, UV and humidity are hard on outdoor cabling. Over time, cable jackets crack, water gets in and connectors corrode. The result is a signal that comes and goes, often worse in wet weather.

Amplifier problems

A failing amplifier can cause intermittent dropouts. Surprisingly, too much amplification can also cause problems. An amplifier that’s too strong for your area can overload the TV’s tuner and cause pixelation, just like a weak signal.

Interference

Mobile phone towers and some electrical devices in the home can interfere with TV signals. If dropouts happen when a particular appliance is on, that’s a clue worth noting down for your technician.

Weather and seasonal effects

During warm, still weather, especially in summer, a phenomenon called tropospheric ducting can carry TV signals much further than normal. Along the Queensland coast, this can mean a distant transmitter interferes with your local one, causing dropouts that come and go with the weather. Storms can also knock antennas out of alignment.

Trees and new obstructions

A tree that’s grown over summer or a new building nearby can gradually block the signal. If your reception has slowly got worse, look at what’s changed around your home.

Is it the TV or the antenna?

Before blaming the antenna, it’s worth ruling out the TV itself. If the problem only happens on one TV, try swapping its antenna cable for one that works on another TV. If the problem follows the TV, it could be a faulty tuner or a setting on that TV. If the problem stays with the wall point, the cabling to that room may be at fault.

Most TVs also have a signal information screen in their settings, showing signal strength and quality. Strength tells you how much signal is arriving, while quality tells you how clean it is. A strong signal with poor quality often points to interference or over-amplification, while low strength points to the antenna, its aim or the cabling.

Checks you can do at home

• Make sure the antenna cable is pushed firmly into the TV and wall plate.
• Run an auto-tune or channel scan on your TV.
• Check any amplifier power supply is plugged in and switched on.
• Test a second TV. If only one TV drops out, the problem is likely that TV or its cable.
• Note when dropouts happen: in wind, rain, hot weather or when an appliance is running.

Keeping track of when the problem happens gives a technician a head start, and can save time (and cost) on the diagnosis.

When to call a technician

Book a professional check if:

• Dropouts happen on every TV in the house.
• Retuning doesn’t help.
• The problem is worse in wind or rain.
• You can see damage to the antenna, mast or cabling.

A technician will measure signal strength and quality with a proper meter, check the antenna and cabling, test the amplifier and look for sources of interference. Please don’t climb onto the roof yourself. It’s risky, and a small change in the antenna’s direction can make things worse.

TV signal repairs across South East Queensland

Mr Antenna fixes dropping TV signals for homes across Greater Brisbane and surrounds, including Logan, Ipswich, and Redcliffe. Wondering what a repair might cost? Our guide to TV antenna installation and repair costs in Brisbane explains what affects the price.