Question 1

when i turn on my game console, the lg tv says 'no signal' on the hdmi port. i have to unplug and replug the hdmi cable to get it.

Accepted Answer

DIAGNOSIS This is an HDMI-CEC (SIMPLINK) and device handshake failure. The TV is not properly detecting the active signal from the source on wake-up. FIX First, enable HDMI Deep Color for that port. Go to Settings > All Settings > General > Devices > HDMI Settings > select the problematic HDMI port > enable 'HDMI Deep Color'. Second, disable Quick Start+. Go to Settings > General > turn off 'Quick Start+'. Power cycle the TV (unplug for 2 minutes). This forces a fresh HDMI handshake on each boot. IF THAT DIDN'T WORK Manually set the input label. Go to Settings > General > Devices > HDMI Settings > edit the input label for that port to 'PC'. This changes the TV's video processing mode and can stabilize the handshake. HEADS UP This model's HDMI ports can be sensitive to lower-quality cables. Use certified Premium High Speed HDMI cables. The issue is most common on HDMI ports 2 and 3. Try a different port as a diagnostic step.

Question 2

the magic remote for my lg nano 75 keeps disconnecting or the pointer is super laggy and unresponsive.

Accepted Answer

DIAGNOSIS This is a Bluetooth pairing interference issue or low remote battery. The remote uses RF and Bluetooth, which can be disrupted by other devices. FIX Re-pair the remote. Point the remote at the TV. Press and hold the BACK and HOME buttons together for 5 seconds until the pairing icon appears on screen. Follow the prompt. Replace the batteries with new AAA alkalines, even if the current ones show charge. Ensure no large objects block the path to the TV's bottom-right sensor. IF THAT DIDN'T WORK Disable competing wireless signals. Move any Bluetooth speakers, USB 3.0 devices, wireless routers, or dense metal objects away from the TV and the remote's usual location. These can cause RF interference. HEADS UP The remote's gyro/pointer requires recalibration if thrown or dropped. Lay the remote flat on a stable surface for 10 seconds. Do not use rechargeable batteries if their voltage is below 1.5V as they can cause lag.

Question 3

the audio from the tv speakers cuts out for a split second every few minutes, happens on all hdmi inputs and apps.

Accepted Answer

DIAGNOSIS This is an audio sync or signal processing bug in webOS, often triggered by certain sound modes or ARC/eARC conflicts. FIX Disable all audio processing. Go to Settings > Sound > Sound Mode > set to 'Standard'. Go to Sound > Additional Settings > turn off 'Auto Volume Leveler' and 'Sound Sync'. Go to Sound > Advanced Settings > Digital Sound Out > set to 'PCM'. Power cycle the TV. IF THAT DIDN'T WORK Reset the audio driver. With the TV on, press and hold the MUTE button on the remote for 10 seconds. The TV will momentarily blank. This forces a re-initialization of the audio subsystem. Check for a software update immediately after. HEADS UP If using an external soundbar via HDMI ARC, the cutting out can be an HDMI handshake issue. Try a different high-speed HDMI cable on the ARC port (HDMI 2). Ensure the soundbar's firmware is also updated.

Question 4

how do i clean the screen on this lg nanocell without damaging it? the microfiber cloth just smears it.

Accepted Answer

DIAGNOSIS Smearing is caused by using a dry cloth on oily fingerprints or using a cleaner not formulated for anti-reflective coatings. The NanoCell screen has a specific coating. FIX Use distilled water only. Power off and unplug the TV. Lightly dampen a clean, lint-free microfiber cloth with distilled water. Wipe the screen gently in a circular motion. Immediately dry the screen with a second clean, dry microfiber cloth using straight strokes. IF THAT DIDN'T WORK For stubborn marks, use a 50/50 mix of distilled white vinegar and distilled water. Dampen (do not soak) the cloth with the solution. Test on a small corner first. Wipe gently and dry immediately. The mild acidity can break down grime. HEADS UP Never spray liquid directly onto the screen. Never use window cleaners, abrasives, paper towels, or compressed air. Do not apply pressure. The anti-glare coating is delicate. Avoid cleaning near the screen's edges to prevent liquid seepage.

Question 5

the built-in apps like netflix and disney+ keep freezing or buffering constantly but my internet is fine on every other device.

Accepted Answer

DIAGNOSIS This is typically a software cache issue with webOS or insufficient RAM for the 4K stream. The TV's network hardware or software is struggling. FIX Clear the app cache and data. Go to Settings > General > Storage > Internal Storage > select 'Cached Data' and clear it. Then go to Settings > Support > Software Update > check for updates. Install any available updates. After updating, power cycle the TV (Settings > General > turn off Quick Start+, then unplug for 2 minutes). IF THAT DIDN'T WORK Change the DNS server. Go to Settings > Network > Wi-Fi Connection (or Wired) > Advanced Settings > DNS Setting > set to Manual. Use 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare). This bypasses often slower ISP DNS servers. HEADS UP The 65NANO75UQA has a 10/100 Ethernet port, not Gigabit. For high-bitrate 4K streams, a strong 5GHz Wi-Fi connection may outperform the wired Ethernet. Avoid using VPNs on the router as webOS apps often fail with them.

Question 6

i'm getting a weird vertical line or band of discoloration down the left side of my lg nanocell screen, it's there on all inputs.

Accepted Answer

DIAGNOSIS This is a panel or T-Con (Timing Control) board fault. A vertical line present on all content indicates a hardware failure in the display driver or connections. FIX Perform a panel self-test to isolate the issue. With the TV off, press and hold the VOLUME DOWN button on the TV itself (not remote). While holding it, press the POWER button on the remote once. The TV will start and display a solid color screen. If the line is still present, the panel is faulty. IF THAT DIDN'T WORK If the line disappeared during the self-test, the issue is with the main board output. Try a factory reset (Settings > General > Reset to Initial Settings) to clear any corrupted video processing firmware. HEADS UP Do not attempt to physically press on the screen. This is not a temporary stuck pixel issue. Document the line with photos/video for LG warranty service. The 65NANO75UQA panel has a specific warranty period separate from the main unit.

Question 7

the tv keeps randomly turning itself off after like 20 minutes of watching. no error code, just goes black and the red light blinks.

Accepted Answer

DIAGNOSIS This is an overheating protection shutdown. The TV's internal temperature sensor is triggering due to insufficient ventilation or a failing component. FIX First, ensure ventilation. The TV requires 4 inches of clear space on all sides, especially the top and back. Remove any objects blocking vents. Second, disable the Eco mode timers. Go to Settings > General > AI Service > turn off 'AI Energy Saving'. Go to Settings > General > Eco Mode > set 'Auto Power Off' to Off. IF THAT DIDN'T WORK Check the power supply board. Overheating can be caused by failing capacitors on the power supply board not regulating voltage correctly, causing the main board to overheat and shut down. HEADS UP Do not place the TV above a fireplace or in direct sunlight. The 65NANO75UQA panel generates significant heat. A cooling fan placed near the top rear vents can be a diagnostic stopgap.

Question 8

my new lg 65nano75 just got delivered but the screen is completely black, no sound, nothing when i press power. the red light is on though.

Accepted Answer

DIAGNOSIS The TV is in standby mode but not fully booting. This is most often a power supply board issue or a failed main board boot sequence. FIX Perform a hard power reset. Unplug the TV from the wall outlet. Press and hold the physical power button on the TV (if present) or the joystick control on the back for 30 seconds. Wait 5 full minutes. Plug the TV directly back into the wall outlet, not a power strip. Press the power button on the remote. IF THAT DIDN'T WORK Check the main board for failed capacitors. Visually inspect the main board (behind the rear panel) for any capacitors with bulging or leaking tops. A failed capacitor on the main board will prevent boot. HEADS UP Do not repeatedly try to power it on. If the hard reset fails, the issue is internal. The 65NANO75UQA uses an external power brick. Ensure the brick's cable is fully seated in the TV's DC input port.

LG 65 inch 65NANO75UQA NanoCell 4K Smart TV

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