Full antenna guide
How to Rescan TV Channels — and When a Rescan Will Not Fix Reception
Use the section map if you only need a quick answer. The full guide covers the diagnostic path, decision factors, practical next steps, and FAQs.
01 / Service detail
Rescan Only After You Confirm a Usable TV Signal
A channel rescan asks the television to search the broadcast frequencies it can receive and rebuild its saved channel list. It can restore channels after a broadcaster change, a new TV setup or an accidentally cleared list. It cannot repair a loose cable, failed wall outlet, damaged antenna, overloaded amplifier or local interference.
The important sequence is: check the source and antenna lead, confirm whether other TVs or neighbours receive the channels, then rescan if the evidence points to tuning. Rescanning during a complete reception failure may remove channels that were previously stored.
If channels keep disappearing or the scan finds nothing despite correct connections, the next step is TV reception diagnosis in Brisbane, not repeated rescans.
Short answer
Open the TV’s settings, choose the broadcast or channel menu, select Antenna or Free-to-Air as the source, and run Auto Tune, Auto Scan or Channel Search. Menu names vary, so use the manufacturer’s manual for the exact path. Do not choose factory reset unless you are prepared to restore every setting and account.
The ABC’s reception troubleshooting guidance warns that a reset or retune can delete stored channels and preferences. The ACMA also recommends diagnosing the reception path rather than assuming tuning is the cause.
02 / Service detail
When a Rescan Is the Right Tool
| Situation | Rescan value | Check first | |---|---|---| | Brand-new television | High | Antenna lead connected; TV source selected | | TV was moved to another address | High | Local transmitter and antenna connection | | Broadcaster advises a retune | High | Follow the broadcaster’s timing | | One saved channel was deleted | Useful | Confirm other channels from that network work | | Picture breaks up in wind or rain | Low | Antenna, cable, signal margin and interference | | Every TV suddenly says No Signal | Low | Shared reception path and local outage | | One outlet fails but another works | Low | Fly lead, outlet and branch | | Scan repeatedly finds zero channels | Diagnostic clue | Correct source, cabling and usable signal |
A rescan changes the channel list. It does not improve the radio-frequency signal reaching the tuner. That distinction prevents a software step from hiding a hardware or reception problem.
03 / Process
A Safe Five-Step Rescan
1. Record what is currently missing
Write down the network names or channel numbers, whether the problem affects standard-definition and high-definition services, and whether any channels still work. This creates a before-and-after record.
If only one network is missing, check that broadcaster’s reception notices before altering the whole list. A broad local outage cannot be fixed inside the television.
2. Confirm the input and antenna connection
Select the tuner source, usually labelled TV, DTV, Live TV, Antenna or Broadcast. Check that the coaxial fly lead is firmly connected at the wall and TV. If a set-top box supplies the tuner, scan through that device rather than the television.
Streaming apps working is not proof of antenna reception. They use the internet and bypass the tuner.
3. Find the channel-search menu
Common menu paths include:
- Settings → Channels → Auto Tuning
- Settings → Broadcasting → Auto Program
- Setup → Digital Setup → Digital Auto Tuning
- Channels → Channel Scan
Choose Antenna, Air, Terrestrial or Free-to-Air if asked for a signal source. Do not select Cable unless the property actually uses a compatible cable service.
4. Let the scan finish
Do not switch the TV off midway. The television will step through available frequencies and save the services it detects. A complete scan may reorder favourites or remove channels it cannot currently receive.
5. Check results before changing more settings
Compare the new list with the record from step one. Test several networks, not just the first channel displayed. If the expected services return and remain stable, the issue was likely the stored list. If they remain absent, stop rescanning and diagnose the signal path.
04 / Service detail
Auto Scan, Manual Tune or Factory Reset?
Auto scan
Use this for a new setup, address change, broadcaster-requested retune or missing saved list. It searches the supported broadcast range automatically.
Manual tune
Manual tuning targets a known frequency or channel. It is useful when you know the intended transmitter and want to test a specific service without rebuilding the entire list.
The Australian Government’s mySwitch service can show the predicted transmitter, channel frequencies, antenna direction and polarisation for a full street address. Treat that output as planning evidence rather than a promise of reception at one roof position.
Factory reset
A factory reset is much broader. It can remove picture settings, network connections, app logins, accessibility preferences and the saved channel list. Use the television manufacturer’s instructions and make a settings record first. It should not be the opening move for an antenna fault.
05 / Service detail
What the Scan Result Tells You
The TV finds all expected channels
The tuning step worked. Test picture stability at different times and note whether any network breaks up. A successful scan followed by intermittent failure points back to reception margin or interference, not the channel database.
The TV finds some networks but not others
Record the missing network group. Television services use different frequencies, so one weak or interfered part of the path can affect a group while others remain visible. Check broadcaster notices and compare another TV before changing equipment. See why some free-to-air channels are missing for the next decision.
The TV finds zero channels
Confirm it scanned the antenna source, not cable or satellite. Then check the fly lead and another working outlet or TV. Zero results on every TV can indicate a shared antenna, main cable, distribution or external problem. Zero on one TV may be device, lead or outlet-specific.
Duplicate or regional channels appear
The antenna may be receiving more than one transmitter. Duplicates can be stored under high channel numbers or produce inconsistent network selection. Use mySwitch to identify the predicted transmitter before attempting a manual tune or changing antenna direction.
06 / Service detail
Why Repeated Rescans Can Make Diagnosis Harder
Repeatedly rescanning changes the evidence. A marginal signal may be found during one scan and missed during another, creating a moving list without fixing the cause. A scan during an outage can also erase services that would have returned when the signal recovered.
Before another scan, record:
- 1affected TVs and outlets;
- 2exact missing networks;
- 3whether failure is constant or intermittent;
- 4weather, appliance or time-of-day pattern;
- 5what another household nearby receives;
- 6changes to cables, splitters, amplifiers or television equipment.
This fault map is more useful than a sequence of undocumented resets.
07 / When to call
When to Move From Tuning to Reception Diagnosis
Request an assessment when the correct scan finds no services, missing channels return only briefly, multiple outlets behave differently, reception changes with rain or appliances, or accessible cable checks do not isolate the fault.
A technician can test the signal at the antenna, distribution points, outlets and tuner, then compare those measurements with the predicted transmitter. That separates tuning from antenna repair and upgrade work and avoids replacing equipment by guesswork.
08 / Questions
Frequently Asked Questions
Will rescanning improve a weak TV signal?
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No. It may save whatever services the tuner can detect at that moment, but it does not strengthen or clean the incoming signal.
Why did a rescan delete channels?
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The TV rebuilds its list from services detected during the scan. If reception was absent or marginal, previously stored services may not be found and can disappear from the list.
Should I use manual tuning?
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Use it when you have reliable transmitter and frequency information, such as mySwitch output, and understand the TV’s menu. Auto scan is simpler for initial setup.
Do all TVs use the same rescan steps?
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No. Menu labels and options vary by brand and model. Use the manufacturer’s current manual for the exact sequence.
What if a new TV finds no channels?
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Check that it has a free-to-air tuner, is connected to an antenna outlet and is scanning Antenna or Terrestrial rather than Cable. Then compare a known-working TV or outlet before assuming the new device is faulty.