How to Fix Pixelation on TV: 8 Proven Solutions
TV pixelating and ruining your viewing? Learn exactly what causes it and try these 8 expert-tested fixes before calling an engineer.
Nothing ruins a film night like pixelation. That annoying mosaic effect where your TV picture breaks into blocks, freezes momentarily, then catches up. It happens on Freeview, Freesat, Sky—you name it.
The good news? Most pixelation is fixable at home in 5 minutes. The better news? If it's not, we can have it repaired same-day for £49-£99.
What Causes Pixelation on TV?
Pixelation happens when your TV doesn't receive the complete signal data. Think of it like a broken phone call where you're missing half the words—your TV fills in the blanks, and you see that blocky, broken-up picture.
Weak Signal
Signal strength below 50% is the #1 cause
Loose Cable Connections
Corroded or loose HDMI/coax cables lose signal
Damaged Aerial
Bent elements or loose connections reduce reception
Weather Interference
Rain and storms weaken signals by 20-40%
4G/5G Tower Interference
New 4G/5G towers can block Freeview signals
8 Proven Ways to Fix TV Pixelation
This fixes the problem 30% of the time because it clears temporary glitches in your tuner box's memory.
- Turn off your TV and tuner box completely
- Wait 30 seconds (let capacitors discharge)
- Power everything back on
- Test a few channels
Success rate: 30% | Time: 1 minute
Corroded or loose cables lose signal strength. Check these:
- Aerial cable: Should be screwed tightly to back of tuner (not just plugged in)
- HDMI cable: Reseat it—remove and reconnect firmly
- Power cable: Make sure tuner isn't getting power spikes
- Satellite cable: (if applicable) Check for water damage or corrosion
Success rate: 25% | Time: 2 minutes
Rescanning resets your tuner's channel database, sometimes fixing pixelation on specific channels.
For Freeview:
- Go to Settings → Channels → Full Retune
- Select Aerial
- Wait for full scan to complete
For Freesat/Sky:
- Press Home → Settings → Installation → Scan
- Select Scan for New Channels
- Wait 5-10 minutes
Success rate: 20% | Time: 3-10 minutes
Signal strength below 50% causes pixelation. Here's how to check:
Freeview:
Settings → Signal Information → Check signal %
Freesat:
Settings → Installation → Signal Level (aim for 85%+)
Sky:
Settings → System Setup → Signal Strength
Signal Quality Guide:
- ✓ 80-100% = Excellent (no pixelation)
- ⚠ 60-79% = Good (occasional pixelation in bad weather)
- ✗ Below 60% = Poor (regular pixelation)
Success rate: 40% (identifies the problem) | Time: 1 minute
Your aerial might be aimed wrong or blocked. Try this:
- Check for obstructions (trees, buildings) between your aerial and the TV transmitter
- Move the aerial 2-3 inches in different directions while watching signal strength
- Try horizontal vs. vertical positioning
- If you have an external aerial on your roof, check that it hasn't been bumped by wind
Success rate: 35% | Time: 5 minutes
Pro tip: If repositioning helps, that means your aerial is in the wrong position permanently. Consider professional realignment to fix it properly.
New 4G and 5G towers can block Freeview signals. If pixelation started recently, this might be the cause.
How to check:
- Visit Ofcom.org.uk/4G
- Enter your postcode
- If your area has 4G rollout nearby, that's likely your culprit
Solution:
Install a 4G/5G filtered aerial. These have special filters that block 4G/5G interference while allowing TV signals through. Cost: £89-£150 installed.
Success rate: 90% (if 4G/5G is the cause) | Time: 1 minute to diagnose
If you have Freesat or Sky, weather or wind can misalign your dish slightly.
- Go to Settings → Installation → Signal Level
- Loosen the dish mounting bolts slightly (don't remove them)
- Gently tilt the dish up/down 1-2mm at a time
- Watch signal level improve
- Retighten bolts once signal improves
⚠ Safety Warning:
If your satellite dish is on the roof, don't attempt this yourself. It's dangerous and easy to make it worse. Call a professional for £69-£99.
Success rate: 60% (if misalignment) | Time: 5 minutes
If none of the above works, your aerial or satellite LNB (the little box on the dish) may be faulty and needs professional replacement.
Signs you need replacement:
- Signal strength shows 20-40% even after repositioning
- Only one specific channel pixelates repeatedly
- Aerial is visibly bent, rusted, or has loose elements
- Pixelation started after high winds or storms
Replacement costs:
- Freeview aerial: £89-£150 installed
- Satellite LNB: £69-£120 installed
- Full dish replacement: £150-£250 installed
Success rate: 99% (eliminates hardware issues) | Cost: £49-£250
Frequently Asked Questions
Is pixelation a sign my TV is dying?
No. Pixelation is almost always a signal or connection problem, not a TV problem. Your TV is just displaying the incomplete data it receives. Less than 5% of pixelation is caused by a faulty TV.
Why does my TV pixelate only during storms?
Rain reduces signal strength by 20-40%. Heavy rain clouds literally block part of the signal. This is normal and usually resolves when weather clears. If pixelation continues after storms, you may have a permanently misaligned dish.
Can a bad HDMI cable cause pixelation?
Very rarely. HDMI cables are digital, so they either work perfectly or not at all. You'd usually see no picture, not pixelation. However, old or damaged coax cables (aerial/satellite input) can definitely cause pixelation.
Should I upgrade to a new TV to fix pixelation?
Absolutely not. Your TV isn't the problem. A brand-new TV will show the same pixelation if your signal is weak. Fix your signal first (it costs £49-£150), then consider a TV upgrade only if you want one.
Is pixelation covered by my TV warranty?
Usually not, because it's not a TV problem. Your warranty covers defects in the TV itself. Pixelation is caused by external factors (signal, cables, aerials). However, if your TV's tuner is faulty, that might be covered—contact your manufacturer.
When Should You Call a Professional?
Call a professional if:
- None of the 8 DIY solutions work
- Signal strength is permanently below 60%
- Your aerial is visibly damaged or rusted
- The dish is on your roof (safety concern)
- Pixelation started after a storm (possible damage)
Still Seeing Pixelation?
If you've tried all 8 solutions and your TV still pixelates, our engineers can diagnose and fix it same-day. We'll check your signal strength, reposition your aerial, replace faulty cables, or swap your LNB—whatever's causing the issue. No fix, no fee.
Same-day service available. Free quotes, no call-out fee.