Question 1

the monitor keeps waking from sleep by itself even though my pc is asleep. it's annoying.

Accepted Answer

DIAGNOSIS The monitor is receiving a false wake signal via the HDMI/DisplayPort cable. This is often caused by a feature called HDMI-CEC or DisplayPort wake signal sensitivity. FIX Disable any 'HDMI Control' or 'CEC' setting in the monitor's OSD menu, usually under 'System' or 'Others'. If no such setting exists, the fix is at the source. On your PC, go to Device Manager > Monitors > Generic PnP Monitor > Properties > Power Management. Uncheck 'Allow this device to wake the computer'. This also often prevents the monitor from self-waking. IF THAT DIDN'T WORK A cheap or damaged cable can leak small voltages that trick the monitor into waking. Try a different, shielded DisplayPort or HDMI cable as a test. HEADS UP If you use a desktop with a dedicated GPU and integrated graphics, ensure the monitor is plugged only into the GPU. Mixed connections can cause weird power state signals.

Question 2

weird green or purple lines flicker on the side of the screen sometimes, mostly on dark backgrounds.

Accepted Answer

DIAGNOSIS Signal integrity issue or a failing connection between the panel and the T-CON board. Often appears as vertical lines on one edge. FIX Reseat all internal connections. This requires disassembly. Unplug monitor. Remove stand. Carefully open the rear plastic case. Locate the thin, flat ribbon cables (LVDS or eDP) connecting the mainboard to the panel. Unlock their connectors, remove the cables, clean contacts with electrical contact cleaner, and reseat firmly. Reassemble. IF THAT DIDN'T WORK The panel itself or the bonded driver chips on the panel's flex cable are defective. This is not user-repairable. The symptom indicates a physical hardware fault requiring panel replacement. HEADS UP Static discharge can kill the panel drivers. Wear an anti-static wrist strap when handling internal cables and boards. If you're not comfortable, do not attempt—seek professional repair.

Question 3

the 240hz refresh rate option is greyed out in windows, i'm stuck at 144hz. using the hdmi cable it came with.

Accepted Answer

DIAGNOSIS The included HDMI cable or your GPU's HDMI port does not support the required bandwidth for 240Hz at 1080p. This is a cable/port limitation. FIX You must use a DisplayPort cable. Purchase a certified DisplayPort 1.4 cable. Connect it from your GPU's DisplayPort output to the monitor's DisplayPort input. The 240Hz option will then be available in Windows Display Settings > Advanced Display Settings. IF THAT DIDN'T WORK Your GPU may not support DisplayPort 1.4. Older GPUs may need a driver update. Also, check the monitor OSD: under 'Game Settings', ensure 'Overdrive' or 'Response Time' is not set to an extreme mode that can sometimes lock refresh rate. HEADS UP Even with DisplayPort, if you enable HDR in Windows, it may cap your refresh rate lower. Disable HDR to test maximum refresh rate.

Question 4

the hdr mode on this monitor makes everything look washed out and grey, not better. what's the point?

Accepted Answer

DIAGNOSIS The monitor is accepting an HDR signal but cannot display it properly. This is an entry-level HDR implementation without local dimming or high peak brightness. FIX For most content, leave HDR OFF in the monitor's OSD 'Picture' settings. In Windows, turn off HDR in Display Settings. If you must use HDR for a game, enable it in Windows/game first, then on the monitor. Then, in the monitor OSD, manually raise Contrast to near max and adjust Color Temperature to 'Warm' to counteract the washed-out look. IF THAT DIDN'T WORK The washed-out look is inherent to the panel's limited contrast and brightness. This model's HDR is a basic signal compliance feature, not a performance feature. There is no fix. HEADS UP Forcing HDR on in Windows with SDR content will make your desktop look terrible. Only enable it system-wide for native HDR games or videos, then disable it after.

Question 5

how do i clean the curved screen on this sansui? the microfiber cloth just smears it more.

Accepted Answer

DIAGNOSIS Oils from skin and dust are creating a film. Using a dry cloth or a cloth with residue just redistributes it. FIX Power off and unplug the monitor. Let it cool. Use distilled water or a 50/50 mix of distilled water and white vinegar on a soft, lint-free microfiber cloth. Wring it out completely—it should be damp, not wet. Wipe the screen gently in one direction. Immediately dry with a second clean, dry microfiber cloth. IF THAT DIDN'T WORK For stubborn spots, use a monitor-specific cleaning spray, never glass cleaner. Spray the cloth, not the screen. The anti-glare coating on this panel is delicate and can be stripped by ammonia or alcohol. HEADS UP Never apply pressure to the center of the curved screen. It's more fragile than a flat panel. Support the back with your other hand while cleaning the edges.

Question 6

there's a faint high-pitched whining or buzzing sound from the back of the monitor, changes with what's on screen.

Accepted Answer

DIAGNOSIS Coil whine from the power supply circuitry or the LCD panel's inverter. It's a physical vibration of inductors or transformers under electrical load. FIX This is a component-level issue. First, try a different, high-quality power outlet on a different circuit. Sometimes dirty power exacerbates it. In the OSD, try lowering the brightness and contrast from max settings. This changes the electrical load and can reduce or shift the noise frequency. IF THAT DIDN'T WORK The whine is built into the specific monitor's components. If it's audible over normal room noise, it's a defect. Contact support. The only true fix is a board replacement, as damping the coils requires disassembly and specialized material. HEADS UP Coil whine is not a safety hazard, but it can be a sign of lower-quality power regulation components. It does not mean the monitor is about to fail.

Question 7

screen goes black for a second randomly during games on my sansui 240hz, sound keeps playing.

Accepted Answer

DIAGNOSIS Display signal is dropping. This is almost always the Adaptive-Sync/FreeSync handshake failing or a weak HDMI/DP cable. FIX First, disable FreeSync in the monitor's OSD menu under 'Game Settings'. Test. If blackouts stop, the issue is with the sync signal. Update your GPU drivers. Use a certified high-speed DisplayPort 1.4 cable, not the included HDMI. In Windows/Nvidia Control Panel, set refresh rate to 240Hz manually, not 'auto'. IF THAT DIDN'T WORK The monitor's mainboard T-CON (Timing Controller) may overheat. Ensure vents are clear. The symptom points to a failing component on the board regulating the high refresh rate signal. HEADS UP Using a non-certified or long cable at 240Hz will cause signal dropouts. The bandwidth requirement is extreme. A '4K' rated cable often works for 1080p 240Hz.

Question 8

my new sansui curved monitor won't turn on at all, no light, nothing. i checked the outlet.

Accepted Answer

DIAGNOSIS Power supply circuit is dead. The external power brick is the most likely failure point. FIX Unplug the power brick from the wall and monitor. Inspect the DC barrel connector cable for damage. Check the brick's LED indicator if it has one. Plug only the brick into the wall. If it shows no light or gets abnormally hot, it's faulty. You need a replacement 12V DC adapter with correct polarity, barrel size (typically 5.5x2.5mm), and at least 3A rating. IF THAT DIDN'T WORK The internal DC power input board or mainboard is faulty. This requires opening the monitor. Check for blown capacitors or burnt components on the small board where the DC barrel jack connects. HEADS UP Never force a different power adapter plug. Incorrect voltage or reversed polarity will instantly damage the internal electronics.

SANSUI 27 Inch Curved 240Hz Gaming Monitor FHD 1080P, 1500R Curve Computer Monitor, 130% sRGB, 4000:1 Contrast, HDR, FreeSync

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