Smart TVs from every major brand can develop issues over time. This guide covers the most common smart TV problems and practical solutions to fix them, whether you own a Samsung, LG, Sony, TCL, Hisense or other model.
Smart TV WiFi Not Connecting
WiFi connectivity is one of the most frequent smart TV complaints. Symptoms include the TV not finding your network, dropping the connection, or showing "connected" but with no internet access.
- Power cycle your TV and router. Unplug both for 60 seconds, then plug the router in first and wait for it to fully start before turning on the TV.
- Go to your TV's network settings (for example, Settings > General > Network on many models) and reset the network connection. Re-enter your WiFi password carefully.
- Update the TV firmware via the Software Update option in the settings menu. Outdated firmware is a common cause of WiFi dropouts on any smart TV.
- If the TV connects to other networks but not yours, the issue may be your router. Try changing the WiFi channel or switching from 5 GHz to 2.4 GHz for better range.
- As a last resort, use an Ethernet cable for a stable wired connection, or add a WiFi extender closer to the TV.
Smart TV Apps Not Working
Streaming apps freezing, crashing, or failing to load is a widespread smart TV issue, especially after system updates or server-side changes by the app provider.
- Clear the app cache from the storage or app management section of your TV's settings. Select the problematic app and choose Clear Cache.
- Uninstall and reinstall the app from your TV's app store.
- Reset your TV's smart hub or app platform (called Smart Hub on Samsung, webOS on LG, Google TV on Sony and others) via the support or self-diagnosis menu. You will need to re-sign in to all apps.
- Check if the streaming service's servers are down. Outages happen across Netflix, YouTube and other platforms regardless of TV brand.
- For older TVs that no longer receive app updates, use an external streaming device such as a Chromecast, Apple TV or Amazon Fire TV Stick.
Smart TV Black Screen
A black screen with or without sound can indicate anything from a minor software glitch to a backlight failure.
- Try a soft reset: hold the power button on the remote for 10 seconds until the TV restarts.
- Check all HDMI cables and input sources. Switch to a different HDMI port to rule out a faulty connection.
- Shine a torch close to the screen. If you can faintly see the picture, the backlight has failed and the TV needs professional repair.
- Disable any ambient light or eco sensor feature in the power and energy saving settings, as these can sometimes dim the screen to black.
Smart TV Screen Flickering
Screen flickering on smart TVs is often caused by software settings rather than hardware failure.
- Disable motion smoothing features (called Auto Motion Plus on Samsung, TruMotion on LG, or MotionFlow on Sony) in the picture or expert picture settings.
- Turn off any eco sensor or energy saving mode, which can cause brightness fluctuations.
- Check the HDMI cable. A loose or damaged cable can cause intermittent flickering, especially at 4K resolution.
- Try a different picture mode. If flickering only occurs in one mode, the issue is software-related.
- Update the TV firmware, as manufacturers regularly release fixes for flickering in software updates.
Smart TV HDMI Not Working
HDMI problems can prevent external devices such as gaming consoles, Blu-ray players and soundbars from displaying correctly.
- Unplug the HDMI cable from both ends, wait 30 seconds, and reconnect firmly.
- Try a different HDMI port on the TV. If one port works, the original port may be faulty.
- Enable HDMI-CEC (branded Anynet+ on Samsung, SimpLink on LG, or BRAVIA Sync on Sony) in the external device settings if your connected device supports it.
- For 4K devices, ensure the HDMI port is set to an enhanced colour or UHD input mode (often called HDMI UHD Color or Input Signal Plus) in the external device settings.
- Test with a different HDMI cable. High-speed or Ultra High Speed HDMI cables are required for 4K and 8K content.
Smart TV Sound Not Working
Audio issues range from no sound at all to distorted, delayed or intermittent sound.
- Check that the TV is not muted and the volume is up. Press the volume button on the TV itself, not just the remote.
- Go to your TV's sound settings and make sure the output is set to TV Speaker (not Bluetooth or HDMI ARC) unless you are using an external speaker.
- Run the built-in sound test, usually found in the support or self-diagnosis menu. If the test tone plays, the issue is with the input source, not the TV.
- For HDMI ARC or eARC soundbar setups, try switching the audio format to PCM in the sound settings.
- A factory reset of the sound settings can resolve persistent audio glitches.
Smart TV Problems After a Software Update
Firmware and software updates occasionally introduce new bugs on any smart TV. Common post-update issues include apps crashing, WiFi dropping, or settings being reset.
- Perform a soft reset after updating: unplug the TV for two minutes, then plug it back in.
- Reset the smart hub or app platform if apps are affected, as above.
- If the update caused serious issues, contact the manufacturer's support team. Follow-up patches are often released within days.
- To prevent future issues, enable automatic updates so you always have the latest fixes via the Software Update settings.
Smart TV Remote Not Working
Remote control issues are common and usually easy to resolve.
- Replace the batteries. Even if the remote light blinks, low batteries can cause intermittent failures.
- Re-pair the remote by following your TV's pairing instructions, often by holding two buttons together for a few seconds.
- Remove obstacles between the remote and the TV's IR sensor. LED light strips and some soundbars can interfere with the signal.
- Try your TV manufacturer's companion remote app (such as Samsung SmartThings or LG ThinQ) on your phone as a temporary remote while troubleshooting.
When to Call a Professional
If your smart TV has physical symptoms such as a cracked screen, persistent backlight failure, or burning smell, it needs professional repair. Contact Manly Electronics for smart TV repairs on the Northern Beaches.
Original 2011 Review: Samsung UA55D8000
This section covers issues specific to the Samsung UA55D8000, a 55-inch LED 3D Smart TV released in 2011. While this model is long discontinued, many of the WiFi and app issues described below were common across smart TVs of that era generally, not just Samsung's. Samsung has since resolved these early growing pains and is now widely regarded as one of the most reliable smart TV brands on the market.
Known Problems
- Poor image quality on DVDs and standard-definition digital TV channels, likely due to an MPEG filter issue. Particularly noticeable in moving details. The TV lacked noise filter settings.
- Difficulty connecting to BigPond (Telstra) WiFi, including password rejection and intermittent connection loss. Replacing the ISP-supplied router with a third-party Netgear or TP-Link router resolved these problems.
- Samsung apps freezing with a "connectivity problem" message, even while WiFi appeared to be working.
- BigPond app sign-in failures showing "incorrect password" despite the same credentials working on a PC.
- YouTube app defaulting to popular clips with poor search usability via the TV remote.
- Inconsistent DLNA streaming from Windows Media Player, particularly for MP4 video files.
- Insufficient internet speed for streaming. The BigPond app required at least 3.5 Mbps, and ADSL connections of 6 Mbps could not handle multiple simultaneous streams.
Solutions That Worked
- Updated the firmware, which was four revisions behind at purchase. Some app freezes persisted even after updating.
- Used a streaming media player (Apple TV or Chromecast) instead of built-in Samsung apps for reliable playback.
- Connected a Telstra T-Box (now Telstra TV) via HDMI for better resolution and reliability than the Samsung BigPond app.
Summary
Despite its issues, the UA55D8000 delivered outstanding HD picture quality with vibrant colours and striking contrasts. The 3D functionality worked well in simulated mode, though 3D TV content never became widely available. Samsung's news ticker app was a notable feature for its time.
The lesson remains relevant: built-in smart TV apps are often the weakest link. A dedicated streaming device connected via HDMI consistently outperforms built-in apps.
July 2011, revised April 2026 Tags: Audio Visual, WiFi