Question 1

screen has a weird purple or green tint on the edges, especially in dark scenes, is this normal?

Accepted Answer

DIAGNOSIS This is color uniformity variance, often called "IPS glow" or backlight bleed. A slight tint on the edges, particularly in dark content, is a characteristic of Nano IPS panels like the one in the 27GP850-B. FIX First, ensure your viewing environment and angle are correct. Sit directly centered in front of the monitor. The tint is most visible from an angle. Adjust the monitor's tilt and height so your eyes are level with the center of the screen. Next, adjust the monitor's brightness. OSD > Picture > Brightness. Lower it from a default 100 to between 60-80 for typical room lighting. High brightness exacerbates glow. Finally, in the OSD under Picture, set Gamma to Mode 2. This is the most accurate gamma and can improve shadow detail, making the tint less noticeable. IF THAT DIDN'T WORK The tint could be influenced by the color temperature setting. In the OSD under Picture > Color Temp, try switching from Cool or Custom to Warm. This reduces blue light, which can minimize a perceived purple cast. For a green tint, manually adjust the Custom color temp, reducing the Green gain slightly. HEADS UP True backlight bleed appears as cloudy white/yellow patches, not a uniform tint. IPS glow is normal and appears as a purplish, bluish, or golden glow that shifts as you move your head. It is not a defect unless it is severe and obstructs content in a well-lit room. Photographing it often makes it look worse than it appears to the eye.

Question 2

the crosshair aim point in the center of the screen won't turn off, i must have pressed something

Accepted Answer

DIAGNOSIS You have accidentally enabled the Black Stabilizer or FPS Counter feature, which includes a dynamic on-screen crosshair, or you have enabled the dedicated Aim Point feature. FIX Press the joystick on the monitor to open the OSD. Navigate to the Game Adjust menu. Scroll down to Aim Point. Toggle it to Off. The crosshair should immediately disappear. If it does not, return to the Game Adjust menu. Find Black Stabilizer. This feature dynamically adjusts gamma and can include a visual reticle in some modes; setting it to 50 (the default) will disable any auxiliary visuals. Also, check the FPS Counter setting in the same menu; while it shows numbers, ensure it is also set to Off. IF THAT DIDN'T WORK Perform a full reset of the monitor's settings. In the OSD, navigate to General. Scroll to the bottom and select Reset. Choose Yes to reset all settings to factory default. This will turn off all game features, including Aim Point, and reset your picture modes. HEADS UP The Aim Point feature is stored per picture mode (Gamer 1, Gamer 2, FPS, etc.). If you switch picture modes, the Aim Point setting for that new mode may be independently on or off. Disable it in each mode you use if you find it re-enables itself.

Question 3

my monitor keeps saying 'check signal cable' and going to sleep even though the pc is on

Accepted Answer

DIAGNOSIS The monitor is losing the video signal intermittently. This is a handshake issue between the GPU and monitor, often triggered by power states or a faulty cable connection. FIX First, replace the DisplayPort or HDMI cable with the one that came with the monitor. If that's not possible, use a certified VESA DisplayPort 1.4 cable. Ensure it is firmly connected. Disable power-saving features that can interrupt the signal. In the monitor OSD, navigate to General > Energy Saving and set it to Off. Also, in the same menu, set Auto Off to Off. In Windows, go to Power & Sleep Settings and set both screen and sleep to Never while troubleshooting. IF THAT DIDN'T WORK The GPU may be entering a low-power state that drops the signal. For NVIDIA GPUs, open the NVIDIA Control Panel. Go to Manage 3D Settings > Global Settings. Find "Power Management Mode" and set it to "Prefer Maximum Performance." For AMD GPUs, in Radeon Software, go to Graphics > Advanced, and disable Vari-Bright and any power efficiency options. HEADS UP If you are using a GPU riser cable or a motherboard PCIe slot that is not Gen 3/4 compliant, it can cause signal instability. Try plugging the GPU directly into the motherboard's primary PCIe slot. Also, check for GPU driver updates that address DisplayPort stability.

Question 4

there's a faint but constant high pitched whining or buzzing noise coming from behind the screen

Accepted Answer

DIAGNOSIS This is coil whine from the monitor's internal power supply or circuitry. It is often related to the backlight brightness level or the refresh rate being used. FIX The noise is often most pronounced at specific backlight brightness levels. Adjust the brightness. Open the OSD, go to Picture, and adjust Brightness. Try setting it to 100% or to a very low level like 20%. Often, the whine diminishes at the extremes. If using a high refresh rate like 180Hz (Overclock), try reducing it to 144Hz in the OSD under Game Adjust > Overclock. IF THAT DIDN'T WORK The whine may be exacerbated by the monitor's power saving features or the specific content being displayed. In the OSD, go to General > Energy Saving and set it to Off. This provides consistent power to the panel. Also, ensure the monitor is plugged directly into a wall outlet, not a power strip with other high-draw devices. HEADS UP Coil whine is not typically a sign of imminent failure but can be a nuisance. It is more common in units with high refresh rate Nano IPS panels. If the noise is severe and changes with the on-screen content, it is a characteristic of the specific unit's components. Contact LG support if the noise is intolerable, as some units are quieter than others.

Question 5

the colors look really washed out and flat on my lg gaming monitor compared to my laptop screen

Accepted Answer

DIAGNOSIS The default picture mode is likely set to Gamer 1 or a non-color-accurate preset. The monitor's wide color gamut (DCI-P3) can also look oversaturated if not managed correctly by the GPU. FIX Press the joystick to open the OSD. Go to Picture. Set Picture Mode to sRGB. This locks the color gamut to the sRGB standard, which is used by most web content and games, and locks many color settings for accuracy. If you need adjustability, use the Custom picture mode. In Custom, set Gamma to Mode 2, set Color Temp to Custom, and adjust R, G, B gains to 50 each as a neutral start. Finally, in Windows, run Display Calibration and ensure the "SDR color appearance" slider is set to the middle (or preferred) position. IF THAT DIDN'T WORK The signal from your GPU may be incorrect. In the NVIDIA Control Panel, under "Change resolution," ensure Output dynamic range is set to Full (not Limited). For AMD Radeon Settings, ensure Pixel Format is set to RGB 4:4:4 PC Standard (Full RGB). A Limited range signal will crush black and white levels, causing a washed-out look. HEADS UP The monitor's HDR mode (labeled HDR Effect in the OSD) is simulation-only and not true HDR. For SDR content, keep HDR turned off in the Windows HD Color settings and the monitor's HDR Effect mode off to avoid distorted colors and brightness.

Question 6

how do i get 180hz to show up in windows? my lg monitor is stuck at 144hz max

Accepted Answer

DIAGNOSIS The 180Hz mode is an Overclock function that must be manually enabled in the monitor's On-Screen Display (OSD) before it becomes available in Windows or driver settings. FIX Press the joystick on the back of the monitor to open the OSD. Navigate to the Game Adjust menu. Select Overclock. Toggle it from Off to On. A warning message will appear; confirm. The monitor will test the overclock. If successful, the setting is saved. Now, in Windows, right-click the desktop and select Display Settings > Advanced Display Settings. Select the monitor, choose Display Adapter Properties, go to the Monitor tab, and you should now see 180Hz in the Screen Refresh Rate dropdown. Select it and apply. IF THAT DIDN'T WORK The 180Hz overclock may fail if your DisplayPort cable is not high-bandwidth. Use the cable that shipped with the monitor. Also, ensure you are connected via DisplayPort, as HDMI on this model is limited to 144Hz. If Overclock fails in the OSD, the monitor will revert to 144Hz; this is a panel limitation and not a fault. HEADS UP Running at 180Hz may slightly increase motion clarity but can also raise panel temperature and, for some units, cause minor visual artifacts. If you see faint horizontal lines or flicker at 180Hz, revert to 144Hz. The overclock setting is per input source.

Question 7

the screen on my 27gp850-b goes black for a second randomly during games, like it's switching inputs

Accepted Answer

DIAGNOSIS This is typically caused by the monitor syncing to a changing refresh rate (Adaptive-Sync) or a momentary signal loss due to cable or port issues. FIX Navigate the OSD with the joystick. Go to Game Adjust > Adaptive-Sync. Toggle it to Off. Test if the black screens stop. If they do, the issue is related to G-Sync or FreeSync handshaking. You can try re-enabling it later with a different setting. Next, check your cable. For high refresh rates at QHD, you must use a high-quality DisplayPort 1.4 cable that came with the monitor or a certified replacement. Reseat the cable at both ends. IF THAT DIDN'T WORK The issue could be GPU driver related or a power saving feature. Update your GPU drivers to the latest stable version. In the NVIDIA Control Panel (for NVIDIA GPUs), under "Manage 3D settings," set "Monitor Technology" to "Fixed Refresh" temporarily to test. In the monitor OSD, navigate to General > HDMI Compatibility Mode and ensure it is set to 1.4 (not 2.0) if you are using an HDMI cable. HEADS UP If you are using a GPU power cable daisy-chain or an underpowered PSU, the GPU may have momentary power dips that cause signal loss. Use separate PCIe power cables for each port on high-end cards.

Question 8

my new lg 27gp850-b says no signal when i turn my pc on, but my old monitor works fine

Accepted Answer

DIAGNOSIS The monitor is powered on but not receiving a video signal from your PC. The most common cause is the monitor defaulting to a source or refresh rate your GPU can't initially output. FIX First, power cycle the entire chain. Turn the monitor off with its power button. Shut down your PC completely. Disconnect the DisplayPort or HDMI cable from both the monitor and the GPU for 30 seconds. Reconnect firmly, ensuring the cable is fully seated. Power on the PC, wait 30 seconds for it to fully boot, then turn the monitor on. Use the monitor's joystick to manually open the input list and select the correct port (DisplayPort 1, DisplayPort 2, or HDMI). IF THAT DIDN'T WORK Your GPU may be trying to output a refresh rate or resolution beyond the monitor's initial capability. Boot your PC with the old monitor. In Windows Display Settings or NVIDIA/AMD Control Panel, set the resolution to 2560x1440 and the refresh rate to 60Hz. Shut down, reconnect the LG monitor, and boot. Once you have a signal, you can increase the refresh rate to 144Hz or 180Hz (Overclock) in the OSD under Game Adjust > Overclock. HEADS UP If using DisplayPort, ensure you are not using an old or faulty DP cable. Version 1.4 is required for full bandwidth. The monitor's "Deep Sleep" mode in energy settings can also cause slow wake-up; you can disable it in the OSD under General > Energy Saving.

Question 9

the on-screen menu joystick feels super stiff and sometimes doesn't register my pushes, am i breaking it?

Accepted Answer

DIAGNOSIS: You're not breaking it, but the joystick/navigation button on the back can be finicky. It's a multi-direction press: up, down, left, right, and a press-in to select. Stiffness or missed inputs usually mean you're not pressing directly in one of the four cardinal directions. FIX: Use the pad of your thumb, not the tip. Place your thumb squarely over the center of the joystick. To move up/down/left/right, apply pressure by sliding your thumb in that direction from the center, don't try to push the edge of the stick. You should feel a distinct click for each direction. To press-in (select), push straight down from the center. Practice navigating a menu you know, like Picture Mode, to get the feel. IF THAT DIDN'T WORK: There's a small chance debris got into the mechanism. With the monitor off, try gently wiggling the joystick in all directions and blowing a short, sharp breath of air around its base to dislodge any dust. Don't use compressed air cans, as they can force moisture inside. HEADS UP: If the joystick is physically stuck or only works in some directions no matter how you press, that's a hardware fault. Contact LG support while the monitor is under warranty. Don't try to pry it open yourself.

Question 10

the hdr mode makes everything look dark and grayish instead of bright and punchy on my ps5.

Accepted Answer

DIAGNOSIS: That's expected behavior for this monitor. The 27GP850-B uses an HDR10 standard but doesn't have the high peak brightness or local dimming of a premium HDR display. In HDR mode, it accepts the signal but can't display it dramatically, often resulting in a washed-out, dim look. FIX: For most users, especially on console, I recommend turning HDR off on the monitor and letting the SDR picture modes do their job. 1) On the monitor, press the joystick and go to Picture > HDR Mode. Set it to 'Off.' 2) On your PS5, go to Settings > Screen and Video > Video Output and turn 'HDR' to 'Off.' You'll get a much brighter, more vibrant image using the 'Game Optimizer' or 'sRGB' picture modes instead. IF THAT DIDN'T WORK: If you're set on using HDR, try adjusting the in-game HDR brightness/paper white settings. Many games have separate HDR calibration sliders. Crank the 'paper white' or midpoint brightness setting up to compensate for the monitor's lower peak brightness. HEADS UP: This monitor's HDR is more of a compatibility feature than a highlight. For a true HDR experience, you'd need a monitor with higher brightness (like 600+ nits) and full array local dimming, which this model doesn't have.

Question 11

how do i clean the screen on this thing? the manual says not to use any liquids but it's got smudges.

Accepted Answer

DIAGNOSIS: You're right to be careful. The screen has a matte anti-glare coating that can be damaged by harsh chemicals or abrasive cloths. Water alone often just smears grease around. FIX: Here's the safe, shop-teacher method. 1) Get a soft, clean, lint-free microfiber cloth—the kind you'd use for glasses or a camera lens. 2) Use dry, gentle pressure in a circular motion for light dust. 3) For fingerprints or smudges, dampen a second microfiber cloth with distilled water (tap water can leave mineral spots). Wring it out completely so it's only barely damp. 4) Wipe the screen gently, then immediately follow up with the dry side of your first cloth to buff it streak-free. IF THAT DIDN'T WORK: For stubborn spots, you can use a 50/50 mix of distilled white vinegar and distilled water. Same process: a barely-damp cloth, then immediate dry buffing. The mild acidity can cut through residue. Avoid the edges where liquid could seep in. HEADS UP: Never spray liquid directly onto the screen. Never use window cleaner, isopropyl alcohol, acetone, or paper towels. These will permanently haze or scratch the anti-glare coating. Always apply liquid to the cloth, not the monitor.

Question 12

i'm getting a weird faint buzzing sound from the back of my 27gp850-b, is it coil whine?

Accepted Answer

DIAGNOSIS: Yes, that's almost certainly coil whine. It's a high-pitched electronic buzz that comes from the internal power components, especially common when the monitor is outputting a very high refresh rate (like 180Hz) or during high frame rate, dark-colored scenes. FIX: First, try changing the refresh rate. 1) Press the joystick, go to Game Adjust > Overclock. 2) Turn 'Overclock' to 'Off.' This drops the max refresh rate from 180Hz to 165Hz. See if the buzzing diminishes or stops. The higher the refresh rate, the more likely coil whine is to occur. IF THAT DIDN'T WORK: The whine might be tied to a specific feature. Go through the Game Adjust menu and try turning off features one by one to see if it stops. Try 'Adaptive-Sync' off. Try 'Black Stabilizer' at 50. Sometimes a specific combination of settings stresses the power circuitry differently and induces the noise. HEADS UP: Coil whine, while annoying, doesn't indicate a failing monitor or a safety issue. It's a physical vibration of components. If it's very loud and happens at all refresh rates, contact LG support, as it might be excessive enough to warrant a warranty claim.

Question 13

the monitor won't wake up from sleep when i move my mouse, i have to turn it off and on again.

Accepted Answer

DIAGNOSIS: This is a common handshake issue between the monitor and your PC's power management. The PC sends a wake signal, but the monitor doesn't recognize it and stays in standby. FIX: Start with the simplest fix. 1) Power off the monitor with its physical button. 2) Unplug the DisplayPort or HDMI cable from both the monitor and your PC. 3) Unplug the monitor's power cord from the outlet for 60 seconds. This performs a full power cycle and clears the monitor's internal memory. 4) Plug everything back in firmly and power on. This often resets the communication. IF THAT DIDN'T WORK: The problem might be on the PC side. Go into your Windows Power Options (search for it in the Start menu). Click 'Change plan settings' for your current plan, then 'Change advanced power settings.' Expand 'PCI Express' and set 'Link State Power Management' to 'Off.' This prevents your graphics card from going into too deep a sleep. HEADS UP: Also check your graphics card driver software. Both NVIDIA and AMD have settings related to monitor power and detection; make sure nothing is set to aggressively turn off the display output.

Question 14

the colors look super washed out and flat compared to my old monitor, did i get a bad panel?

Accepted Answer

DIAGNOSIS: You almost certainly didn't get a bad panel. Out of the box, the monitor defaults to a gamer-focused 'Gamer 1' picture mode which prioritizes speed over color accuracy. It makes things look washed out. FIX: Let's set it up for better color. 1) Press the joystick button on the back. 2) Go to Picture > Picture Mode. 3) Change it from 'Gamer 1' to 'sRGB.' This will immediately look more natural. For even better control, go to Picture > Color Adjust. Set Gamma Mode to 'Mode 2' (this is the sRGB standard) and set Color Temp to 'Warm.' That's a good baseline. IF THAT DIDN'T WORK: The issue might be your graphics card output settings. Right-click your desktop, open your NVIDIA Control Panel or AMD Radeon Software. Under 'Change resolution,' make sure the output color format is set to 'RGB' (not YCbCr) and output dynamic range is set to 'Full' (not Limited). Limited range crushes your blacks and whites. HEADS UP: The 'sRGB' mode locks some color settings, which is fine for most users. If you want to calibrate further, you'll need to switch to a 'Gamer' or 'Custom' picture mode and adjust from there.

Question 15

the monitor stand wobbles a lot on my desk when i type, is this normal for the 27gp850-b?

Accepted Answer

DIAGNOSIS: That's not normal. The stock stand is generally sturdy. The wobble usually means the stand isn't fully locked into the monitor body, or your desk surface isn't perfectly level or is itself flexible. FIX: Here's what to check. First, grasp the monitor head with both hands and gently try to tilt it forward and back. If it moves independently of the stand, the quick-release isn't engaged. 1) Carefully lift the monitor off the stand. 2) Look at the red locking lever on the back of the stand's neck—make sure it's fully pushed down into the 'locked' position. 3) Re-seat the monitor onto the stand until you hear a solid click. IF THAT DIDN'T WORK: The issue is probably your desk. Try placing the monitor in a different spot on the desk. If the wobble stops, your original spot is uneven or the desk is too thin/light. Consider a monitor arm—the 27GP850-B has a standard 100x100mm VESA mount, and a solid arm will eliminate desk-born wobble completely. HEADS UP: When you re-seat the monitor, do it on a soft surface like a carpet or towel in case you drop it. Don't force it; it should click into place smoothly.

Question 16

my new lg 27gp850-b keeps going black for a second and then coming back on, especially when gaming.

Accepted Answer

DIAGNOSIS: You're likely dealing with the monitor's VRR (Variable Refresh Rate) feature, specifically G-Sync Compatible or AMD FreeSync, interacting poorly with your graphics card or game. The screen blanks as it re-negotiates the refresh rate. FIX: First, try turning off the adaptive sync feature on the monitor itself. Press the joystick button on the back, go to Game Adjust > Adaptive-Sync, and set it to 'Off.' Play your game and see if the blackouts stop. If they do, you've confirmed the source. IF THAT DIDN'T WORK: The issue could be your DisplayPort cable. This monitor is picky about cables. Swap in a different, high-quality DisplayPort 1.4 cable that's certified for high bandwidth. A flaky cable can cause signal drops that look like black screens. HEADS UP: If you turn Adaptive-Sync off, you'll lose the smoothness benefit. Once you've swapped the cable, you can try turning Adaptive-Sync back on. Sometimes a firmware update for your graphics card drivers can also fix these handshake issues.

LG 27GP850-B 27 inch QHD Gaming Monitor

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