Question 1

the magic remote pointer is super jumpy and inaccurate, can't select anything right

Accepted Answer

DIAGNOSIS The remote's gyro sensor is getting interference. Usually from strong ambient light or reflective surfaces. FIX Turn off or dim any bright lights behind you, especially LED or CFL bulbs. Cover any glossy surfaces (glass tables, picture frames) in front of the TV. Point the remote directly at the TV screen from no more than 10 feet away. IF THAT DIDN'T WORK Re-pair the remote. Press and hold the Back and Home buttons together for 5 seconds until the pairing message appears on screen. Follow the prompts. HEADS UP The remote uses an infrared sensor for pointing, not Bluetooth. Never use cleaning chemicals on the sensor window at the top. It will cloud the plastic.

Question 2

the power light just blinks red 3 times and the tv won't turn on at all

Accepted Answer

DIAGNOSIS Three red blinks is a definite error code. It means a problem with the TV's internal power supply or main board. FIX Unplug the TV from the wall for 5 minutes. Plug it directly into a wall outlet, not a power strip. Try turning it on. If the code returns, the internal power supply (PSU) board has failed. IF THAT DIDN'T WORK A failed main board can also cause this code. You must open the TV and test for DC voltages from the PSU. If all voltages are present, the main board (EAX67177504) is the cause. HEADS UP Do not ignore this code. Repeated attempts can damage other boards. This is a component-level repair. Call a technician if unsure.

Question 3

i get no sound from external devices connected to the hdmi ports, tv speakers work

Accepted Answer

DIAGNOSIS The audio signal from your external device is not being routed to the TV's internal speakers. This is almost always caused by the TV's Sound Out setting being configured for an external audio system (like HDMI ARC or an optical output), which mutes the internal speakers. The TV is waiting to play sound through a different device. FIX Press the Settings (gear) button on your LG remote. Navigate to All Settings > Sound > Advanced Settings. Select Sound Out. Change the selection from HDMI ARC or External Speaker to TV Speaker. The sound should immediately return. Test with your HDMI device. IF THAT DIDN'T WORK The issue may be an incompatible audio format. Try these steps: On the same HDMI device, ensure its audio output is set to a compatible format like PCM or Stereo, not Bitstream or Dolby Digital. On the TV, go to All Settings > Sound > Advanced Settings > Digital Sound Out. Set this to PCM. Try a different, known-working HDMI cable. Test the external device on a different HDMI port on the TV to rule out a port-specific fault. HEADS UP HDMI port 2 on your 43UR7300PSA is the ARC (Audio Return Channel) port. If you connect a soundbar or AV receiver to this port, you must set Sound Out to HDMI ARC. For all other standard HDMI devices (like game consoles or streaming boxes), Sound Out should be set to TV Speaker for sound to come from the TV itself.

Question 4

the tv won't connect to my 5ghz wifi, only finds the 2.4, my other devices work fine

Accepted Answer

DIAGNOSIS Your LG TV's wireless hardware or software has limited 5GHz band support. It cannot detect the specific channel your router is currently using, often because the router is set to a DFS (Dynamic Frequency Selection) channel (52-144) or a high-band channel (149-165) that the TV's wireless module doesn't recognize. This is a common compatibility issue with some smart TVs. FIX Access your router's admin settings via a web browser on a computer or phone. Locate the wireless settings for your 5GHz network. Manually change the 5GHz channel to a lower, non-DFS channel like 36, 40, or 44. Apply the settings and allow your router to reboot. On your LG TV, go to All Settings > Connection > Network > Wi-Fi Connection and select Scan again. Your 5GHz network should now appear. IF THAT DIDN'T WORK First, perform a power cycle: unplug the TV and your router for 60 seconds, then plug them back in. If the issue persists, reset the TV's network settings (Settings > General > Reset to Initial Settings > Network Settings Reset). As a last resort, the internal Wi-Fi antenna cable connection could be loose; securing it requires opening the TV's back panel, which should only be attempted if you are comfortable with electronics repair. HEADS UP Forcing your router to use a standard low-band channel (36-48) is the most reliable fix. Avoid "Auto" channel selection on your router, as it frequently chooses DFS channels that many TVs cannot see.

Question 5

how do i clean the screen on this lg without ruining it? the manual is scary

Accepted Answer

DIAGNOSIS The LG 43UR7300PSA features a sophisticated 4K LED panel with a specialized anti-glare coating. This layer is chemically sensitive; using harsh household chemicals, abrasive sponges, or excessive pressure can cause permanent "clouding," streaks, or physical scratches that cannot be buffed out. The goal is to remove oils and dust without stripping the chemical treatment or forcing liquid into the bezel where the electronics reside. FIX Power Down: Turn off the TV and unplug it from the wall. A dark screen makes smudges more visible and prevents electrical shorts if moisture is used. Dry Dusting: Use a clean, high-density microfiber cloth. Gently wipe the screen in a consistent horizontal or vertical direction. Avoid circular motions, as this can smear oils across the panel. Tackling Smudges: If dry wiping fails, lightly dampen a second microfiber cloth with distilled water. Do not use tap water, as minerals can leave white streaks or scratch the surface. The "Damp-Dry" Method: Wring the cloth out until it is barely damp to the touch. Wipe the affected area gently, then immediately follow up with the dry microfiber cloth to remove any lingering moisture. IF THAT DIDN'T WORK For stubborn organic residue or grease that water cannot move, create a solution of 50% distilled water and 50% white distilled vinegar. Apply the solution to the cloth—never directly to the screen. Wipe the spot with minimal pressure. Immediately dry the area with a clean microfiber cloth to prevent the vinegar from etching the coating. HEADS UP Never use Windex, glass cleaners, rubbing alcohol, acetone, or paper towels. Paper towels are made of wood pulp and will create microscopic scratches. Most importantly, never spray any liquid directly onto the screen; gravity will pull the fluid into the bottom edge of the panel, which can cause permanent vertical line failures or a complete board short.

Question 6

webos is so slow and laggy on this tv, menus take forever to load, is mine broken?

Accepted Answer

DIAGNOSIS Your TV is likely not hardware-broken. The 43UR7300PSA uses a mid-range processor that can struggle when the webOS system cache becomes bloated or when too many background processes are running. Laggy menus and slow app launches are typically caused by "system clutter"—accumulated temporary data, fragmented storage, and background updates that consume the limited available RAM. FIX To restore snappiness to the interface, follow these optimization steps: Clear System Cache: Navigate to All Settings > General > System > Storage. Identify apps using excessive space and clear their cache. Additionally, go to General > System and select "Delete Viewing History" and "Delete Voice Recognition Information" to prune unnecessary database files. Run Device Care: Go to All Settings > Support > Device Care and select "Optimize Now." This utility flushes temporary files and optimizes the system's current memory allocation. Disable Quick Start+: Go to All Settings > General > Devices > TV Management and toggle off "Quick Start+". While this makes the TV take slightly longer to turn on, it forces a full system reboot every time you power off, preventing the RAM from becoming clogged over time. IF THAT DIDN'T WORK If the lag persists, try these advanced steps: Perform a Power Cycle: While the TV is on, unplug the power cord from the wall. Wait at least 60 seconds. While unplugged, hold the physical power button on the TV chassis for 15 seconds to drain remaining capacitors. Plug it back in. Limit Background Apps: Uninstall any apps you do not use frequently. Each installed app can occasionally trigger background update checks that eat into CPU cycles. Network Refresh: Sometimes "menu lag" is actually a network timeout. Restart your router or switch from Wi-Fi to a wired Ethernet connection to see if the UI responsiveness improves. HEADS UP Avoid performing a full Factory Reset unless absolutely necessary, as this removes all account credentials and custom calibrations. Be aware that because this model has limited onboard storage, you will need to repeat the "Device Care" optimization every few months to maintain peak performance.

Question 7

tv makes a loud clicking sound from the back every few minutes, it's driving me nuts

Accepted Answer

DIAGNOSIS That's the plastic housing expanding and contracting from heat changes. The mounting clips or screws are too tight. FIX Unplug the TV. Lay it screen-down on a soft blanket. Remove the back cover. Check all screws along the perimeter. Loosen each one a quarter-turn, do not remove them. This allows the plastic to flex without popping. IF THAT DIDN'T WORK The sound may be coming from the power supply board. A failing capacitor can cause a rhythmic tick. Inspect the PSU board for bulging tops or leaking electrolyte. HEADS UP Do not overtighten screws when reassembling. Snug is enough. Cracked plastic is not repairable.

Question 8

my new lg 43ur7300psa just shows a black screen with sound when i turn it on, picture never comes on

Accepted Answer

DIAGNOSIS You have sound, which confirms the TV's main processor and power supply are mostly functional. The black screen with audible audio points to a failure in the video signal path between the main board and the LCD panel itself. Since you can hear sound, the backlight is likely on but very dim (you may see a faint glow in a dark room). The most common culprits are a loose connection on the T-Con (Timing Control) board, a failed T-Con board, or a faulty main board not sending the correct video signal. FIX First, perform a soft reset: unplug the TV from the wall outlet, hold the physical power button on the TV (if present) for 30 seconds, then plug it back in and power on. If that fails, internal inspection is needed. Unplug the TV for at least one hour. Remove the back cover by unscrewing all screws along the edges. Locate the long, narrow T-Con board; it's mounted near the center top, connected to the main board via a single flat cable and to the LCD panel with two thin, wide ribbon cables. Carefully unplug and firmly reseat the ribbon cable connections on the T-Con board. Reassemble and test. IF THAT DIDN'T WORK If reseating cables doesn't help, the T-Con board (part number 6870L-2583A) or the main board (EAX67177504) has likely failed. You'll need to test voltages on the T-Con board's fuses with a multimeter or swap in a known-good board. For most users, the next step is ordering a replacement main board, as it's the more common point of failure and easier to swap. Ensure any replacement board matches your TV's exact model and serial number prefix. HEADS UP TV internals hold high-voltage charge even when unplugged. Avoid touching the large silver capacitors on the power supply board. Always ground yourself by touching the TV's metal chassis before handling circuit boards, and never touch the gold contacts on the ribbon cables.

LG 43 inch 43UR7300PSA 4K Smart TV

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