Step-by-step troubleshooting for Sony, Samsung, and LG premium TVs, plus Sonos home theater and eero mesh Wi-Fi, from your Twin Star installation team in Naples, Florida.
Soft Reset — Resolves Most TV Issues in Under 60 Seconds
Hold the POWER button on your remote for 5–10 seconds until the TV turns off and restarts on its own. Wait 60 seconds. Works on Sony, Samsung, and LG — clears temporary errors without erasing any settings.
1Aim remote at TV IR sensor
2Hold POWER for 5–10 seconds
3Confirm shutdown on screen
4Wait 60 seconds, then restart
Quick Navigation
Streaming · Gaming · Bluetooth · 4K/HDR
Connected Devices
Troubleshooting for every device plugged into your AV system — Apple TV, Roku, Fire Stick, PS5, Xbox, and Bluetooth audio devices. Covers HDMI, HDCP errors, 4K/HDR setup, CEC control, and input lag.
16
Guides
Universal — All Connected Devices
Device Plugged In But No Signal
TV shows 'No Signal' even though device is connected
Easy
Likely Cause
Wrong input selected, HDMI cable not fully seated, or HDMI handshake failed between devices.
Steps to Fix
1
Confirm the HDMI port number on the TV back matches the input number selected on screen — mismatch is the #1 cause.
2
Unplug the HDMI cable from both ends, then firmly reseat it. A loose connection prevents signal handshake.
3
Power cycle everything: turn off TV and device, unplug both from power for 60 seconds, then restart TV first, device second.
4
Try a different HDMI cable. Low-quality or damaged cables are a leading cause of 'No Signal' errors.
5
Try a different HDMI port on the TV. Port 1 is most compatible with legacy devices; Port 2 or 3 is typically HDMI 2.1 for 4K/120Hz.
Pro Tip: On Sony: HDMI 3 is the eARC port. On Samsung: use Input Signal Plus per port. On LG: use HDMI Deep Colour per port. Mismatched port settings cause signal failures even with a perfect cable.
HDCP Error / Purple Screen
Purple error screen or 'HDCP Unauthorized' when playing content
Easy
Likely Cause
HDCP (copy-protection handshake) failed — caused by a loose cable, unsupported HDMI switch/splitter, or incompatible HDCP versions.
Steps to Fix
1
Unplug both ends of the HDMI cable, then firmly reseat them. Power cycle both the TV and source device.
2
If using an HDMI switch, splitter, or AV receiver between the TV and device: bypass it and connect directly to the TV to test.
3
Try a different HDMI port on the TV — not all ports support HDCP 2.2 on every TV model.
4
Replace the HDMI cable with a Premium High Speed or Ultra High Speed certified cable. Cheap cables fail HDCP 2.2 negotiation.
5
For Roku specifically: Settings → Display Type → change resolution if error persists after cable swap.
Important: HDCP errors do NOT mean content is pirated or that you're doing anything wrong — it simply means the copy-protection handshake between two legitimate devices failed. It's almost always a cable or HDMI switch issue.
4K / HDR Not Displaying — Picture Looks Like 1080p
Connected device outputs 4K but picture looks soft or HD-quality
Moderate
Likely Cause
HDMI port not set to Enhanced/UHD mode, wrong HDMI port, low-quality cable, or source device not outputting 4K resolution.
Steps to Fix
1
Enable Enhanced Mode on the TV HDMI port: Sony → Settings → Watching TV → External Inputs → HDMI Signal Format → Enhanced Format. Samsung → Settings → External Device Manager → Input Signal Plus → On (per port). LG → Settings → All Settings → General → External Devices → HDMI Settings → HDMI Deep Colour → On.
2
Move the device to the correct HDMI port — not all ports support 4K/60Hz or HDR on all TV models. Check your TV manual for port capabilities.
3
Use a Premium High Speed HDMI cable (HDMI 2.0) for 4K/60Hz HDR. Use an Ultra High Speed HDMI cable (HDMI 2.1) for 4K/120Hz.
4
Check the source device resolution: Apple TV → Settings → Video and Audio → Resolution. Roku → Settings → Display Type. Xbox → Settings → Display & Sound → Video Output. PS5 → Settings → Screen and Video → Video Output → Resolution.
5
Confirm your streaming plan supports 4K — Netflix, Disney+, Apple TV+ require specific subscription tiers for UHD content.
Pro Tip: Streaming 4K requires at least 25 Mbps of sustained bandwidth to your TV. If eero shows strong signal but 4K degrades to HD, run a speed test directly on the TV (Settings → Network → Connection Status or Speed Test).
CEC / HDMI Control Not Working
TV remote doesn't control volume on soundbar, or devices don't auto-switch input
Easy
Likely Cause
HDMI-CEC (Consumer Electronics Control) is disabled on TV, source device, or soundbar — or a non-CEC-compliant cable is in use.
Steps to Fix
1
Enable CEC on the TV: Sony → Settings → Watching TV → External Inputs → Bravia Sync Settings → Bravia Sync Control → On. Samsung → Settings → General → External Device Manager → Anynet+ (HDMI-CEC) → On. LG → Settings → All Settings → General → SIMPLINK (HDMI-CEC) → On.
2
Enable CEC on the connected device: Apple TV → Settings → Remotes and Devices → Control TVs and Receivers → On. Roku → Settings → System → Control other devices (CEC) → On. Xbox → Settings → TV & display options → TV & amp; → Device control → On.
3
If using a soundbar between the TV and source: enable CEC on the soundbar and confirm the HDMI cable is in the ARC/eARC port.
4
Power cycle everything after enabling CEC — devices must re-establish the CEC connection after the setting is turned on.
Pro Tip: CEC goes by different brand names: Bravia Sync (Sony), Anynet+ (Samsung), SIMPLINK (LG), EasyLink (Philips). They are all the HDMI-CEC standard and are cross-compatible when set correctly.
Streaming Devices — Apple TV, Roku & Fire Stick
Apple TV 4K — No Picture or Black Screen
Apple TV turns on but TV shows no signal or black screen
Easy
Likely Cause
Resolution mismatch, wrong HDMI port, or Match Dynamic Range causing a blank screen during format switching.
Steps to Fix
1
Hold Menu + Volume Down on Siri Remote for 5 seconds to cycle through resolutions — TV will switch every 20 seconds. Select OK when picture appears.
2
Try a different HDMI port and a certified HDMI cable.
3
If using an AV receiver or HDMI switch: bypass it and connect Apple TV directly to TV to isolate the issue.
4
Disable Match Frame Rate: Settings → Video and Audio → Match Content → Match Frame Rate → Off. This eliminates blank flashes when switching content.
Pro Tip: Apple TV 4K (3rd gen) supports HDMI 2.1. For 4K/120Hz on compatible Sony, Samsung, or LG TVs, connect to the HDMI 2.1 port (typically HDMI 1 or 2) and enable Enhanced Format on that port.
Apple TV — Audio Out of Sync or Looping
Dialogue is ahead or behind the picture; audio loops after pausing
Easy
Likely Cause
eARC handshake delay, soundbar lag, or tvOS audio buffer issue.
Steps to Fix
1
Restart Apple TV: Settings → System → Restart. This clears audio buffer state and resolves most sync issues.
2
If using a Sonos Arc or Beam: adjust AV Sync in the Sonos app → System → [Room] → TV Setup → AV Sync.
3
Disable Match Dynamic Range if enabled: Settings → Video and Audio → Match Content → Match Dynamic Range → Off.
4
If audio loops after pausing: force-quit the streaming app (double-press TV button, swipe up on the app).
Roku — Won't Connect to Wi-Fi
Roku shows error connecting, or drops Wi-Fi after initial setup
Easy
Likely Cause
Router DHCP issue, wrong Wi-Fi password, or Roku firmware needs update.
Steps to Fix
1
Restart router first (unplug 30 seconds), wait 2 minutes, then restart Roku: Settings → System → Power → System Restart.
2
Forget and re-add the network on Roku: Settings → Network → Set up connection → Wireless. Re-enter the password.
3
Move Roku closer to the eero access point. Roku devices are sensitive to signal strength — below −70 dBm causes instability.
4
Check router for MAC address filtering or device blocking — Roku may need to be approved in the eero app.
Pro Tip: Reserve a static IP for Roku in the eero app: Devices → [Roku] → Reserve IP. This prevents DHCP conflicts that cause random disconnects.
Roku — HDCP Error or Purple Screen
'HDCP Unauthorized' message appears when trying to stream content
Easy
Likely Cause
HDCP handshake failed between Roku and TV — almost always a cable or port issue, not a content issue.
Steps to Fix
1
Unplug the HDMI cable from both Roku and TV, wait 10 seconds, firmly reseat both ends.
2
Power off both TV and Roku, unplug from wall for 60 seconds, then reconnect.
3
Try a different HDMI port on the TV.
4
Replace the HDMI cable. Use a short cable under 6 feet for best HDCP reliability.
5
Roku: Settings → Display Type → change resolution to 1080p if error only appears on 4K content.
Amazon Fire Stick — Freezing or Buffering
Fire Stick lags, apps crash, or video constantly buffers
Easy
Likely Cause
Insufficient storage, cache buildup, or weak Wi-Fi signal.
Check storage: Settings → My Fire TV → About → Storage. Keep at least 500 MB free — delete unused apps if full.
4
Check Wi-Fi signal: Settings → Network → [your network]. Move Fire Stick closer to an eero unit or use an HDMI extender cable to move it away from the TV chassis.
5
Factory reset as last resort: Settings → My Fire TV → Reset to Factory Defaults.
Pro Tip: Fire Stick runs hot inside enclosed TV cabinets. Use the included HDMI extender cable to give it space and airflow — overheating causes throttling and buffering.
Gaming Consoles — PS5 & Xbox
PS5 — No Signal or Black Screen on TV
PS5 powers on but TV shows no signal or remains black
Easy
Likely Cause
Resolution set too high for TV, wrong HDMI port, or PS5 HDMI port dust/damage.
Steps to Fix
1
Boot PS5 in Safe Mode: hold Power button for 7 seconds until two beeps. Select 'Change Resolution' to drop to 1080p.
2
Confirm the HDMI cable is in the HDMI OUT port on PS5 (not HDMI IN) — an easy mistake to make behind a TV cabinet.
3
Move to a different HDMI port on the TV. For 4K/120Hz on PS5, use the port labeled HDMI 2.1.
4
Enable Enhanced Format on the TV's HDMI port (see 4K/HDR guide above).
5
Inspect the PS5 HDMI port for bent pins — a common hardware issue. If damaged, contact Sony or Twin Star for service.
Pro Tip: PS5 → Settings → Screen and Video → Video Output → Resolution: set to Automatic. Enable 4K and 120Hz independently under Video Output → 4K Video Transfer Rate and Automatically Set to 120Hz.
PS5 — 4K or HDR Not Working
PS5 connected but TV not showing 4K resolution or HDR
Moderate
Likely Cause
TV HDMI port not in Enhanced mode, HDMI cable not rated for 4K/120Hz, or PS5 4K/HDR not enabled.
Steps to Fix
1
Enable Enhanced Format on the TV HDMI port connected to PS5 (see the 4K/HDR guide above for brand-specific steps).
2
Use an Ultra High Speed HDMI 2.1 cable for 4K/120Hz with VRR.
3
PS5: Settings → Screen and Video → Video Output → Enable 4K and HDR → enable both.
4
PS5: Settings → Screen and Video → Video Output → HDR → On (Always on HDR).
5
For VRR: Settings → Screen and Video → Video Output → VRR → On. Confirm VRR is enabled in TV settings too.
Xbox Series X / S — No Signal or Black Screen
Xbox powers on but no picture on TV
Easy
Likely Cause
HDMI cable in wrong port, resolution too high, or HDMI handshake needs reset.
Steps to Fix
1
Hold Xbox button for 10 seconds to full shutdown. Wait 30 seconds. Power on again.
2
Boot in Low Resolution Mode: hold Power + Eject (or Bind on Xbox S) for 15 seconds until you hear a second beep.
3
In Low Resolution Mode: Settings → General → TV & display options → Resolution → set to 1080p, then test with full settings after picture confirmed.
4
Try a different HDMI port and a different HDMI cable.
5
If using Xbox One (original): confirm HDMI cable is in the HDMI OUT TO TV port — Xbox One has a second HDMI IN port that is for cable box passthrough only.
Pro Tip: Xbox Series X supports 4K/120Hz with VRR on HDMI 2.1. For VRR to work: Xbox Settings → TV & display → Refresh rate → 120Hz AND your TV's HDMI port must have Enhanced/UHD mode enabled AND VRR enabled separately in TV settings.
Gaming — Input Lag or High Latency
Controls feel delayed, game response is sluggish
Easy
Likely Cause
TV Game Mode not enabled, post-processing features adding latency, or VRR/ALLM not active.
Steps to Fix
1
Enable Game Mode on TV: Sony → Settings → Display & Sound → Picture → Picture Mode → Game. Samsung → Settings → All Settings → General → External Device Manager → Game Mode Settings → Game Mode → On. LG → Quick Settings → Game Optimizer → On.
2
Disable all motion/image processing: MotionFlow (Sony), Auto Motion Plus (Samsung), TruMotion (LG) — these add 1–2 frames of latency.
3
Enable Auto Low Latency Mode (ALLM) on the TV — this switches to Game Mode automatically when a console is detected.
4
For Xbox: Settings → TV & display options → Video modes → Auto low latency mode → On.
5
For PS5: Settings → Screen and Video → Video Output → Enable VRR → On.
Pro Tip: In full Game Mode with ALLM active, Sony BRAVIA 9 and Samsung QN90D deliver input lag as low as 1.3ms at 4K/120Hz. This is imperceptible. If lag is still noticeable, check the game's internal V-Sync setting — enabling V-Sync inside a game adds more latency than the TV ever could.
Bluetooth Headphones & Speakers
Bluetooth Headphones Won't Pair to TV
Headphones not appearing in TV Bluetooth list or failing to connect
Easy
Likely Cause
Headphones already paired to another device, TV Bluetooth cache conflict, or incompatible A2DP profile.
Steps to Fix
1
Disconnect headphones from all other devices (phone, tablet, laptop) before attempting TV pairing.
2
Put headphones into fresh pairing mode — hold the pair button until the LED blinks rapidly. Don't just turn them on; force a new pairing session.
3
On the TV: navigate to Bluetooth settings and remove/forget any previous entry for those headphones, then rescan.
4
Restart TV: hold POWER on remote 5–10 seconds until TV restarts. Retry pairing immediately after reboot.
5
Keep headphones within 1 meter of the TV during pairing — Bluetooth pairing range is much shorter than normal use range.
Important: Sony and LG TVs output Bluetooth audio with a slight delay (~200ms). This is normal for Bluetooth and causes visible lip sync offset. For latency-free audio, use a wired connection, Sonos ARC/Beam via HDMI eARC, or headphones that support aptX Low Latency.
Bluetooth Audio Cuts Out or Drops During Use
Headphones or speakers connected but audio stutters or disconnects
Easy
Likely Cause
Interference from other 2.4 GHz devices, Bluetooth antenna obstruction, or device too far from TV.
Steps to Fix
1
Keep Bluetooth headphones within 20–25 feet of the TV with no walls between them.
2
Move Wi-Fi routers and cordless phones away from the TV — 2.4 GHz Wi-Fi and Bluetooth share the same spectrum.
3
Disconnect other Bluetooth devices from the TV — most TVs can only maintain one active Bluetooth audio connection.
4
Update TV firmware — Bluetooth stability fixes are commonly included in firmware updates.
5
Re-pair the device: forget it in TV Bluetooth settings and go through fresh pairing.
Sony BRAVIA · Google TV
Sony TV Troubleshooting
Common fixes for Sony BRAVIA 5, 7, 8, 9, and A95L OLED. Always try the soft reset on the Overview page first — it resolves the majority of issues without any settings loss.
12
Guides
All Sony BRAVIA Models
TV Won't Turn On
No standby light, no response to remote or power button
Easy
Root Causes
Power cord not fully seated, surge protector failing, or capacitors need to drain.
Steps
1
Check the LED indicator at the bottom-center bezel. If no light at all: unplug from wall, wait 2 minutes, replug directly — bypass any surge protector or strip.
2
Try the physical power button on the TV (bottom edge under the logo, or left side panel).
3
Point remote directly at the IR sensor (bottom-center of TV). Replace batteries. Hold POWER for 3 full seconds.
4
If LED blinks a specific number of times, count the blinks — Sony uses these as diagnostic codes. Search sony.com/support for your model + "blink code."
No standby light at all? Try a completely different wall outlet on a different circuit. Surge protectors and older power strips often fail silently.
Black Screen / No Picture
TV powers on but screen stays completely black
Easy
Root Causes
Incorrect input source selected, HDMI handshake failure, or Energy Saver blanking the display.
Steps
1
Press INPUT on remote. Cycle through each source (HDMI 1–4, etc.) and wait 5 seconds on each.
2
Unplug ALL HDMI cables. Wait 60 seconds. Plug back in one at a time.
3
Soft reset: hold POWER on remote 5–7 seconds until "Power Off" appears. Wait 60 seconds for restart.
4
Backlight test: in a dark room, shine a flashlight at the screen. If you faintly see an image, the backlight has failed — contact Twin Star.
HDMI No Signal
Correct input selected but device shows no signal or wrong resolution
Easy
Root Causes
HDMI cable loose or failed, wrong signal format setting, or source device outputting an incompatible resolution.
Steps
1
Confirm HDMI port number on TV back matches the input selected on screen.
2
Unplug cable at both ends. Firmly reinsert. Try a different cable.
3
Power cycle: turn off source device AND TV. Power source device on first, then TV.
4
Adjust HDMI Signal Format: Settings → Channels & Inputs → External Inputs → HDMI Signal Format → Enhanced Format (4K/HDR) or Standard (older devices).
BRAVIA 5, 7, 8, 9: HDMI 3 and 4 support HDMI 2.1 (4K/120Hz). Use these ports for PS5, Xbox Series X, or gaming PCs.
No Sound / Wrong Audio Output
No audio from TV speakers or soundbar, or incorrect output routing
Easy
Root Causes
Wrong audio output device selected, ARC/eARC handshake issue, or audio format mismatch.
Steps
1
Confirm TV is not muted. Press MUTE or VOL+ on remote.
2
Settings → Display & Sound → Audio Output. Select TV Speaker (built-in) or your soundbar (external).
3
For ARC/eARC soundbar: use the HDMI port labeled ARC/eARC. Enable Bravia Sync on both TV and soundbar.
4
Set audio format: Settings → Display & Sound → Audio Output → ARC/eARC Mode → Auto (Passthrough).
Wi-Fi Drops or Slow Streaming
TV disconnects from Wi-Fi, streaming is choppy, or network not found
Moderate
Root Causes
Corrupted DNS settings, router channel congestion, stale DHCP lease, or outdated TV firmware.
Steps
1
Restart TV and router. Unplug router 30 seconds, allow full restart, then restart TV.
2
Change DNS: Settings → Network & Internet → Wi-Fi → Edit → IP Settings → Static → DNS 1: 8.8.8.8
3
Forget and rejoin: Settings → Network & Internet → Wi-Fi → Select network → Forget → Reconnect.
4
Update firmware: Settings → System → About → System Update.
TV Running Slowly / Apps Lagging
Home screen sluggish, apps slow to open, Google TV unresponsive
Easy
Root Causes
Energy Saver mode throttling the CPU, app cache buildup, or outdated OS version.
Steps
1
Disable Energy Saver: Settings → System → Power & Energy → Energy Saver → Off.
2
Restart TV: Settings → System → Restart.
3
Update firmware: Settings → System → About → System Update.
Daily Viewing: Standard or Custom with Motionflow → Smooth (low value).
4
Enable Auto HDR Tone Mapping: Display & Sound → Picture → Advanced Settings → Video Signal → Auto.
5
Run Panel Pixel Shift where available to reduce static content retention over time.
Factory Reset
Last Resort — Factory Reset
Full Reset — Sony BRAVIA / Google TV
Permanently erases all accounts, apps, settings, and network credentials. Cannot be undone.
A factory reset is irreversible. Try all troubleshooting steps on this page before proceeding.
Step 01
Open Settings
Press HOME on remote → gear icon → All Settings
Step 02
Navigate to System
Select System from the Settings menu
Step 03
Select About
About → Reset → Factory Data Reset
Step 04
Confirm Reset
Confirm the reset. The TV will restart automatically. Allow 3–5 minutes.
Step 05
Complete Setup
Follow the on-screen wizard to reconnect Wi-Fi, sign in to Google, and reinstall apps
Samsung Neo QLED · QLED · The Frame
Samsung TV Troubleshooting
Common fixes for Samsung Neo QLED, QLED, The Frame, and Crystal UHD running Tizen Smart Hub. Try the soft reset first: hold POWER for 10 seconds until the TV fully restarts.
10
Guides
All Samsung Smart TV Models
TV Won't Turn On
No standby light, no response from remote or physical button
Easy
Root Causes
Loose power cord, failed surge protector, One Connect Box issue, or remote needs re-pairing.
Steps
1
Check the small red standby light at the bottom edge. If lit, the TV has power — the issue is the remote.
2
Unplug TV (and One Connect Box if present) for 30 seconds. Reconnect directly to a wall outlet, bypassing surge protectors.
3
Press the physical POWER button on the TV itself (bottom edge or side).
4
Re-pair remote: point at TV, hold Return and Play/Pause simultaneously for 3+ seconds.
5
If standby light is lit but TV won't power on, service is required. Contact Twin Star Technology.
One Connect Box (Neo QLED / The Frame): Disconnect and firmly reconnect the Invisible Connection cable. A loose connection here causes phantom power failures.
Black Screen / No Picture
TV powers on but screen is completely black
Easy
Root Causes
Wrong input source, loose HDMI cable, no signal from source, or backlight failure.
Steps
1
Press SOURCE or HOME and cycle through all HDMI inputs (1–4).
2
Unplug ALL HDMI cables. Wait 60 seconds. Plug back in one at a time.
3
Soft reset: hold POWER on remote for 10+ seconds until TV fully restarts.
4
Backlight test: shine a flashlight at the screen in a dark room. If you see the home screen faintly, the backlight has failed.
5
Run diagnostic: Settings → Support → Device Care → Self Diagnosis → Picture Test.
Intermittent black screen with HDMI: Try disconnecting all HDMI cables except the one in use. Disable VRR/G-Sync in your PC GPU settings.
HDMI No Signal
Connected device shows no signal, wrong resolution, or source not detected
Settings → Support → Device Care → Manage Storage → [App] → Clear Cache. Force-close and relaunch.
2
Update apps: press HOME → Apps → gear icon → Auto Update.
3
Delete and reinstall any specific crashing app from the Samsung Apps store.
4
Reset Smart Hub: Settings → Support → Device Care → Self Diagnosis → Reset Smart Hub.
Soft Reset — Resolves Most Issues
The correct restart procedure for all Samsung Tizen Smart TV models
Easy
Root Causes
Samsung's soft reset clears temporary system errors and fixes most common issues in under 2 minutes without erasing settings.
Steps
1
Aim the remote at the TV's IR sensor at the bottom edge.
2
Hold POWER on the remote for 10+ seconds until the TV screen flashes off and restarts automatically.
3
The TV will power down, show the Samsung logo, and restart. Wait for full boot.
4
If the TV does not respond, unplug from wall for 30 seconds, then replug and press POWER.
Always run the soft reset before attempting any other fix. It resolves the majority of Tizen Smart Hub issues including black screens, audio glitches, and app problems.
Factory Reset
Last Resort — Factory Reset
Full Reset — Samsung Tizen / Smart Hub
Permanently erases all accounts, apps, settings, and network credentials. Cannot be undone.
A factory reset is irreversible. Try all troubleshooting steps on this page before proceeding.
Step 01
Open Settings
Press HOME → gear icon → All Settings → Support
Step 02
Device Care
Select Device Care → Self Diagnosis
Step 03
Reset Smart Hub
Select Reset Smart Hub for apps-only reset. Enter PIN: 0000
Step 04
Full Factory Reset
Settings → General → Reset → enter PIN 0000 → confirm
Step 05
Complete Setup
Follow on-screen wizard to reconnect Wi-Fi, sign in to Samsung account, and reinstall apps
LG OLED · QNED · webOS
LG TV Troubleshooting
Common fixes for LG OLED (C4, G4, B4), QNED, and NanoCell TVs with the Magic Remote. Soft reset: unplug TV, then hold the physical power button on the back of the TV for 30 seconds.
10
Guides
All LG Smart TV Models
TV Won't Turn On
No standby light or no response from Magic Remote or buttons
Easy
Root Causes
Loose power cord, Magic Remote needs re-pairing, or capacitors need to drain.
Steps
1
Check the LED indicator at bottom-right of screen. If no LED: unplug for 2 minutes, then replug to a direct wall outlet.
2
Press the physical joystick button on the back of the TV (center-bottom of rear panel) to power on without remote.
3
Re-pair Magic Remote: point at TV and hold HOME + OK simultaneously for 5 seconds.
4
Check the LED blink pattern — LG uses blink codes for fault diagnosis. Count the blinks and search lg.com/us/support.
No response from any input: Unplug from wall, then hold the physical power button on the TV for 30 full seconds to discharge capacitors. Reconnect power.
Black Screen / No Picture
TV appears on but screen is completely dark
Easy
Root Causes
Input source mismatch, Energy Saving blanking display, or HDMI device issue.
Steps
1
Press INPUT on Magic Remote. Cycle through every source (HDMI 1–4).
2
Disable Energy Saving: Settings → All Settings → Picture → Energy Saving → Off.
3
Soft reset: hold POWER on Magic Remote for 5+ seconds until reboot prompt. Confirm restart.
4
Run Picture Test: Settings → All Settings → Support → Self Diagnosis → Picture Test.
OLED models (C4/G4/B4): OLED pixel refresher may run briefly at first use of the day. Wait 1–2 minutes after power-on before troubleshooting.
HDMI No Signal or Input Not Detected
Source shows no signal, wrong resolution, or device missing from inputs
Easy
Root Causes
Incorrect input selected, cable quality issue, or HDMI port compatibility mode needs adjustment.
Steps
1
Confirm the physical HDMI port number on TV back matches the input number selected on screen.
2
Unplug both devices. Power on source first, then TV.
3
Try a different HDMI cable and a different HDMI port on the TV.
4
Adjust HDMI compatibility: Settings → All Settings → Channels → External Devices → HDMI Settings → HDMI Deep Colour → Enable for 4K/HDR, Standard for older devices.
OLED C4/G4 — HDMI 4: Supports full HDMI 2.1 with 4K/120Hz, VRR, ALLM, and G-Sync. Use it for your primary gaming or home theater source.
No Sound or Audio Problems
No audio from TV or soundbar, or dialogue is hard to hear
Easy
Root Causes
Wrong audio output, SIMPLINK CEC conflict, or audio format incompatibility.
Steps
1
Confirm TV is not muted. Press MUTE or VOL+ on Magic Remote.
2
Settings → All Settings → Sound → Sound Out. Select Internal TV Speaker or your soundbar.
3
For ARC/eARC soundbar: confirm cable is in the ARC port. Enable SIMPLINK: Settings → General → SIMPLINK → On.
4
Set audio format: Settings → All Settings → Sound → Additional Settings → Digital Sound Out → Passthrough.
Wi-Fi Drops or Streaming Issues
TV disconnects from network, streaming buffers, or Wi-Fi not found
Moderate
Root Causes
Stale DHCP lease, DNS misconfiguration, outdated webOS firmware, or router frequency conflict.
Steps
1
Restart TV and router. Router first, wait 2 minutes, then restart TV.
2
Set DNS: Settings → All Settings → Network → Wi-Fi Connection → [Your Network] → Edit → DNS Server → 8.8.8.8
3
Forget and rejoin: Settings → All Settings → Network → Wi-Fi Connection → [Network] → Forget → Reconnect.
4
Update webOS: Settings → All Settings → Support → Software Update → Check for Updates.
5
LG OLED and QNED TVs have a Gigabit Ethernet port. Wired connection eliminates wireless variables entirely.
TV Slow or webOS Lagging
Home screen sluggish, Magic Remote pointer stutters, apps load slowly
Easy
Root Causes
webOS cache buildup, outdated software, or Home Dashboard overloaded.
Steps
1
Clear cache: Settings → All Settings → Support → Self Diagnosis → Clear Cache.
2
Update webOS: Settings → All Settings → Support → Software Update → Check for Updates.
3
Remove unused devices from Home Dashboard to reduce background scanning load.
4
Soft reset: hold POWER on Magic Remote for 5+ seconds → select Restart.
Magic Remote Not Working or Not Registering
Magic Remote unresponsive, pointer disappears, or won't re-pair
Easy
Root Causes
Dead batteries, lost Bluetooth pairing, or Magic Remote gyroscope needs recalibration.
Steps
1
Replace Magic Remote batteries (AAA x2).
2
Deregister and re-pair: Settings → All Settings → General → External Devices → Magic Remote Settings → Deregister Magic Remote → Re-register.
3
Re-register shortcut: point at TV and hold HOME + OK for 5 seconds.
4
Use ThinQ app (iOS/Android) as a temporary remote while troubleshooting.
Pointer missing: Wave the Magic Remote left and right vigorously to wake the gyroscope. Set pointer: Settings → Accessibility → Pointer Options.
Picture Quality — Calibration & Best Settings
Colors look off, motion blurry, or OLED not at its best
Moderate
Root Causes
Wrong picture mode, TruMotion enabled, or display calibration not optimized.
Steps
1
Select Filmmaker Mode for movies — disables all post-processing for studio-accurate color.
2
Turn off TruMotion: Settings → All Settings → Picture → Additional Settings → TruMotion → Off.
3
For gaming: enable Game Optimizer (G-Sync/VRR + Low Latency) from the quick access menu.
4
OLED C4/G4: run OLED Care → Self Pixel Refresh monthly and enable Screen Saver for static content.
OLED ABL: OLED panels at very high brightness may trigger ABL (Automatic Brightness Limiter). This is normal panel protection — not a defect. Use Cinema or Filmmaker Mode for best sustained HDR.
TV Turns Off or On By Itself
Unexpected power events — random shutdowns or TV powers on without input
Easy
Root Causes
SIMPLINK CEC device sending power commands, No Signal Auto-Off, or Quick Start+ waking the TV.
Steps
1
Check event log: Settings → All Settings → Support → Self Diagnosis → Diagnostics History.
2
Disable auto power off: Settings → All Settings → General → Timers → Auto Power Off → Off.
3
Disable SIMPLINK: Settings → All Settings → General → SIMPLINK → Off.
4
Disable No Signal Auto-Off: Settings → All Settings → General → No Signal Auto Power Off → Off.
Apps Crash or Won't Load
LG Content Store apps freeze, fail to launch, or can't be installed
Easy
Root Causes
Outdated webOS app, cache corruption, or LG account token expired.
Steps
1
Clear cache: Settings → All Settings → Support → Self Diagnosis → Clear Cache. Restart TV.
2
Update apps: Home → LG Content Store → Manage Apps → Update All.
3
Sign out and back into LG account: Settings → All Settings → General → LG Account → Sign Out → Sign In.
4
Delete and reinstall the specific app from LG Content Store.
Factory Reset
Last Resort — Factory Reset
Full Reset — LG webOS
Permanently erases all accounts, apps, settings, and network credentials. Cannot be undone.
A factory reset is irreversible. Try all troubleshooting steps on this page before proceeding.
Step 01
Open Settings
Press gear button on Magic Remote → All Settings
Step 02
Go to Support
Select Support from the settings menu
Step 03
Self Diagnosis
Self Diagnosis → Reset to Initial Settings
Step 04
Enter PIN
Enter TV PIN (default: 0000) and confirm. Allow 3–5 minutes.
Step 05
Complete Setup
Follow on-screen wizard to reconnect Wi-Fi, sign in to LG account, and install updates
Sonos Home Theater Audio
Sonos Support & Troubleshooting
Common fixes for Sonos Arc, Beam, Amp, and Sub. Select your product below. Contact Twin Star if any issue persists after following these steps.
18
Guides
Sonos Arc — HDMI eARC Soundbar
Arc Setup — First-Time Connection to TV
Connecting Sonos Arc via HDMI eARC for the first time
Easy
Root Causes
Arc requires HDMI eARC (not standard ARC) for full Dolby Atmos TrueHD passthrough, plus HDMI-CEC for volume control.
Steps
1
Plug the included HDMI cable into the port labeled eARC on the TV rear panel. Always check the label — not just any HDMI port.
2
Power on Arc. Open Sonos app → + → Add Product → Home Theater → Arc. Follow guided setup.
3
Enable HDMI-CEC on TV: Sony (Bravia Sync) / Samsung (Anynet+) / LG (SIMPLINK).
4
Set TV audio output to eARC: Sony → Display & Sound → Audio Output → ARC/eARC. Samsung → Sound Output → Receiver (HDMI). LG → Sound Out → HDMI (ARC).
5
Run Trueplay after setup: Sonos app → System → [Arc] → Trueplay. Walk through room holding phone at ear height.
Dolby Atmos passthrough: Set TV Audio Format to Passthrough (not Bitstream or PCM). In your streaming app, confirm Atmos is enabled under audio settings.
Arc No Sound After TV Restart
Arc goes silent after TV power cycles or after switching inputs
Easy
Root Causes
eARC handshake did not re-establish after TV restart — the most common Arc support issue.
Steps
1
Power cycle Arc: unplug power cable for 10 seconds, replug.
2
Use only the cable supplied with Arc or a Premium High Speed HDMI 2.1 cable. Budget cables fail eARC handshake requirements.
3
Manually toggle TV audio output: set to TV Speaker, wait 5 seconds, then switch back to Arc/eARC.
4
Verify HDMI-CEC is still enabled — some TV firmware updates silently reset this to Off.
HDMI ARC vs eARC: Full lossless Dolby Atmos TrueHD requires eARC. Standard ARC delivers Atmos via Dolby Digital Plus — excellent, but not lossless.
Lip Sync / Audio Out of Sync
Dialogue sounds ahead of or behind the picture
Easy
Root Causes
Video processing latency on TV, or Arc delay setting needs adjustment.
Steps
1
Sonos app → System → [Arc] → TV Setup → AV Sync. Adjust slider until lips and audio align.
2
Enable Filmmaker Mode on the TV to remove video processing delays.
3
Disable any HDR tone mapping or AI picture enhancement that adds frame processing latency.
Trueplay Not Calibrating or No Improvement
Trueplay fails, or room calibration has no audible effect
Moderate
Root Causes
Trueplay requires an Apple iOS or iPadOS device. Android cannot perform Trueplay tuning.
Steps
1
Use an iPhone or iPad running the Sonos app. Android is not supported.
2
Walk continuously to all corners and seating areas, holding phone at ear level. Keep moving.
3
Eliminate background noise during calibration (HVAC, conversation, appliances).
4
If Trueplay is grayed out: update Sonos app and iOS, ensure iPhone is on same Wi-Fi as Arc.
Arc Won't Connect to Wi-Fi or Shows Offline
Arc disappears from app, won't reconnect, or shows unavailable
Power cycle Arc (unplug 30 seconds) and restart router. Power router fully before reconnecting Arc.
2
Wi-Fi must use WPA2 or WPA3. WEP is not supported by any Sonos product.
3
Reset network settings only: hold Join button on back of Arc for 5 seconds until LED pulses orange/white. Room assignments and audio settings are preserved.
Sonos Beam Gen 2 — HDMI ARC Soundbar
Beam Gen 2 Setup — HDMI ARC Connection
First-time connection of Sonos Beam Gen 2 to any TV
Easy
Root Causes
Beam Gen 2 uses HDMI ARC (not eARC). Always use the port labeled ARC on the TV.
Steps
1
Connect Beam Gen 2 to the port labeled ARC on the TV rear.
2
Open Sonos app → + → Add Product → Home Theater → Beam Gen 2. Follow guided setup.
3
Enable HDMI-CEC: Sony (Bravia Sync) / Samsung (Anynet+) / LG (SIMPLINK).
4
Set TV audio output to ARC (matching the port in use).
5
Run Trueplay after setup (iPhone/iPad required): Sonos app → System → [Beam] → Trueplay.
Beam Gen 2 delivers Dolby Atmos via Dolby Digital Plus over ARC. For lossless Dolby TrueHD Atmos, upgrade to Sonos Arc (requires eARC).
Beam No Sound or Audio Cuts Out
No audio from Beam or sound drops randomly during use
Set impedance: Sonos app → [Amp] → Settings → Speaker Impedance. Default 8 ohm; change to 4 ohm if required.
5
For TV audio via Amp: connect TV optical output to Amp optical input. Set TV audio → PCM.
Sonos Amp delivers 125W RMS per channel (8 ohm). Do not wire more than one pair of 8-ohm speakers per channel without a speaker selector switch.
Amp Sound on One Channel Only or Distorted
One speaker is silent, audio is distorted, or balance shifted
Moderate
Root Causes
Loose or crossed speaker wire connection, incorrect impedance setting, or short circuit.
Steps
1
Inspect all speaker wire connections at the Amp terminals. Touching + and − strands cause distortion or protection shutoff.
2
Verify impedance setting matches your speakers.
3
Swap speaker connections to determine if issue follows the Amp output or the wire run.
4
If distortion only at high volume: reduce Amp output ceiling in app and check speaker wattage rating.
Amp Offline or Not Found in App
Amp disappears from Sonos app or won't complete initial setup
Easy
Root Causes
Network credentials changed, IP conflict, or firmware update in progress.
Steps
1
Power cycle Amp (unplug 30 seconds). Restart router first, wait 2 minutes, then reconnect Amp.
2
Try a different Ethernet port and replace the patch cable.
3
Reset network settings only: hold Join button on back for 5 seconds until LED flashes orange/white.
Sonos Sub — Wireless Subwoofer
Sub Setup — Pairing to Beam or Arc
Adding Sonos Sub or Sub Mini to an existing soundbar system
Easy
Root Causes
Sonos Sub uses Wi-Fi, not a cable. It must be on the same network as the soundbar before pairing.
Steps
1
Plug Sub into power. Open Sonos app → System → [Your soundbar room] → Add Surrounds & Sub → Sonos Sub.
2
Follow in-app pairing steps. Keep Sub and soundbar in the same room during initial pairing.
3
Once paired, run Trueplay again (iPhone required) to recalibrate the whole system.
4
Sub LED not solid white? Wait 90 seconds after power-on for full boot.
Sub placement: Sonos Sub is omnidirectional. Placing it in a room corner reinforces low-frequency output by ~3 dB at no cost to clarity.
Sub Producing No Bass
Sub is paired and online but no audible low-frequency output
Easy
Root Causes
Sub level set to zero, Night Sound suppressing bass, or content has no low-frequency content.
Steps
1
Sonos app → System → [Room] → Sub Level slider. Increase to a higher value.
2
Play bass-heavy content to verify (movie trailer, action scene, bass-heavy music).
3
Disable Night Sound: Sonos app → System → [Room] → Night Sound → Off.
4
Re-run Trueplay (iPhone required). Trueplay may set a very low crossover in rooms with excessive resonance.
Checking Sub directly: With moderate volume and bass-heavy content playing, place your palm on the Sub enclosure — you should feel vibration even if the output seems subtle.
Sub Disconnects or Shows Offline
Sub drops from app intermittently or shows as unavailable
Moderate
Root Causes
Sub too far from Wi-Fi access point, DHCP conflict, or router interference.
Steps
1
Move Sub closer to an eero unit or Wi-Fi router. Sub needs a signal above −65 dBm for stable connection.
2
Power cycle Sub (unplug 30 seconds) and the soundbar it's paired with.
3
Reserve a static IP for Sub in eero app: Devices → [Sub] → Reserve IP.
Sub Not Found During Pairing
App says "Sub not found" when attempting to add it to the soundbar
Easy
Root Causes
Sub not fully online, or app session needs refresh.
Steps
1
Confirm Sub LED is solid white. If blinking white, wait 90 seconds.
2
Force-quit Sonos app. Reopen → System → [Soundbar room] → Add Surrounds & Sub → retry.
3
Confirm phone is on same Wi-Fi as Sub and soundbar. VPN or Guest network prevents discovery.
4
Reset Sub network settings: hold Join button on Sub bottom for 5 seconds until LED flashes.
eero Mesh Wi-Fi Network
eero Wi-Fi Troubleshooting
Common fixes for eero, eero Pro, eero Pro 6, 6E, and eero Max mesh systems. Start with the LED Status guide — the LED color tells you exactly what to do next.
8
Guides
eero Mesh — Setup, Connectivity & Speed
Understanding LED Status Lights
Your fastest diagnostic — what every eero LED color and pattern means
Easy
Root Causes
The eero LED communicates network status at a glance. Reading it correctly saves unnecessary troubleshooting.
Steps
1
Solid White — Online and functioning normally.
2
Blinking White — Starting up or connecting. Wait 1–2 minutes.
3
Solid Red — No internet. Follow the "No Internet" guide below.
4
Blinking Red — Factory resetting in progress. Do not unplug.
5
Yellow / Amber — Power supply issue. Use only the included eero USB-C adapter.
6
Solid Blue — Setup mode, paired with eero app for configuration.
7
Dark LED (off) — Normal if you've disabled LED in app. Does NOT mean it's offline.
Turn LED off for a cleaner installation: eero app → Settings → Network Settings → LED Indicator → Off.
Solid Red Light — No Internet
One or all eeros show solid red — no internet connection
Easy
Root Causes
ISP outage, modem needs restart, faulty Ethernet cable, or double-NAT from modem/router combo.
Steps
1
Test first: plug a laptop directly into the modem via Ethernet. If laptop also has no internet, the problem is ISP or modem — not the eero.
2
Restart modem: unplug power, wait 30 seconds, replug. Wait 2–3 full minutes before testing.
3
Restart gateway eero: unplug for 30 seconds, replug. LED will blink white, then turn solid white when online.
4
If only a satellite eero shows red: restart that unit. If it stays red, move it closer to the gateway eero.
ISP combo units (Xfinity, AT&T, Spectrum): Enable Bridge Mode on the ISP device to prevent double-NAT conflicts.
eero Drops or Disconnects Randomly
Devices lose connection, speeds fluctuate, or brief offline periods
Restart in order: modem first (wait 3 min) → gateway eero → satellite eeros one at a time. Never restart all simultaneously.
2
Check eero app → [each eero] → Details. Any unit with yellow or red dot needs individual restart.
3
Check placement: max 40–50 feet between eeros, line of sight preferred. Cordless phones and microwaves cause interference.
4
Reserve static IPs for frequently disconnecting devices: eero app → Devices → [Device] → Reserve IP.
Twin Star recommendation: For homes with multiple 4K TVs and Sonos systems, we recommend Ethernet backhaul between eero units for dedicated mesh bandwidth.
eero Not Found in App During Setup
New eero won't appear during setup, or satellite won't add to network
Easy
Root Causes
Phone Bluetooth not enabled, eero not in setup mode, or app needs reset.
Steps
1
Enable Bluetooth on your phone — eero uses Bluetooth for initial discovery. No pairing required; just leave it on.
2
Confirm eero LED shows solid or blinking blue. If not: factory reset by holding the recessed button on back for 15 seconds until LED blinks red, then blue.
3
Stand within 5 feet of the eero during setup. Bluetooth discovery range is limited.
4
Force-quit eero app, reopen, and start setup from the beginning.
Slow Wi-Fi Speeds Through eero
Speeds on wireless devices slower than your internet plan
Moderate
Root Causes
Device connected to farther eero, wrong Wi-Fi band, modem bottleneck, or interference.
Steps
1
Baseline test: plug a device directly into gateway eero via Ethernet. If wired speed matches plan, issue is wireless placement.
2
Wireless near gateway: run speed test next to gateway eero. Good speed here = satellite placement issue.
3
Enable Band Steering: eero app → Settings → Network Settings → Band Steering → On.
4
Move eero away from microwave ovens, cordless phones, baby monitors, and Bluetooth speakers.
eero Pro 6E and eero Max use a dedicated 6 GHz radio as backhaul — your entire 2.4 GHz and 5 GHz spectrum stays free for your devices.
Wired Devices Not Working Through eero
Device connected via Ethernet to eero has no internet
Easy
Root Causes
Cable to wrong port (WAN vs LAN), damaged cable, or eero LAN port needs restart.
Steps
1
Confirm Ethernet is in a LAN port, not the WAN/Internet port. WAN port is only for modem-to-gateway connection.
2
Try a different Ethernet cable. Use Cat5e minimum; Cat6 for speeds above 1 Gbps.
3
Restart the specific eero: unplug for 30 seconds, replug.
4
Check device network settings for conflicting static IP from a previous router.
Device Not Visible in App or Profile Not Applying
Device not in app, parental controls not working, or schedule not applying
Easy
Root Causes
Device on guest network, app needs refresh, or Profile assignment needs reset.
Steps
1
Force-quit and reopen eero app. Tap Discover → Devices for updated list.
2
Confirm device is on main eero network — not Guest network. Guest devices cannot be managed.
3
Tap device → Edit → rename, then re-assign to the correct Profile.
4
Toggle Profile off and back on to force a policy refresh.
Full eero Network Reset — Starting Over
Complete reset after home move, ownership change, or persistent fault
Moderate
Root Causes
Full reset erases all network settings, device names, profiles, and parental controls.
Steps
1
Open eero app → Settings → Advanced Settings → Reset Network. Factory resets all eeros simultaneously.
2
Individual unit reset: hold recessed button on back for 15 seconds until LED blinks red, then blue.
3
After reset: set up gateway eero first (connected to modem via Ethernet). Add satellite eeros one at a time.
4
After setup: reconfigure network name, password, device names, Profiles, and parental controls.
Moving or replacing your modem? You do NOT need to factory reset the eero. Only restart the gateway eero after new modem is online.
Twin Star Technology LLC
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