🔧 Fix Guide
7 Sep 2026
The 27-inch QHD panel is capped at 60Hz and 144Hz doesn't appear as an option, typically because the monitor is connected over an old HDMI 1.4 or non-certified cable, the USB-C input is not carrying the full 144Hz signal, the refresh rate is set to 60 in Windows, or the GPU driver isn't exposing 144Hz. Fixes in order: use the DisplayPort 1.4 input, set 2560x1440 at 144Hz in Windows, update the GPU driver, and try a VESA-certified DisplayPort cable.
🔧 Fix Guide
7 Sep 2026
Colors on the EX2780Q look pale, hazy, or over-bright, usually because HDRi or Brightness Intelligence Plus is tone-mapping SDR content, the monitor is left in an HDR/Vivid picture mode on a non-HDR source, the PC is sending limited RGB over HDMI, or a wrong color temperature is selected. Fixes in order: turn off HDRi, pick a Standard or Game picture mode, disable Brightness Intelligence Plus, set the correct RGB range, then factory-reset the OSD if it persists.
🔧 Fix Guide
21 Aug 2026
The EX2780Q shows a black screen or "no signal" even though it is powered, usually because the wrong input source is selected in the OSD, a loose or low-bandwidth HDMI/DisplayPort cable at 1440p/144Hz, a USB-C laptop that the monitor will not reliably drive (the USB-C port does not deliver power), the panel sleeping and not waking, or a GPU driver/output fault. Fixes in order: pick the right input, reseat the cable, wake from standby, power-cycle, lower resolution to test, then rule out the GPU.
🔧 Fix Guide
21 Aug 2026
The EX2780Q's pair of 2.5W treVolo-tuned speakers produce no audio, usually because the PC's audio output device points at the GPU's own HDMI/DP audio rather than the monitor, the monitor is muted or at zero volume in the OSD, audio isn't carried over the active input, or the GPU audio driver needs a reinstall. Fixes in order: pick the EX2780Q as the default playback device, raise the OSD Audio volume, connect via HDMI/DisplayPort, and update the HDMI/DP audio driver.
🔧 Fix Guide
21 Aug 2026
Screen flicker or brightness pulsing when FreeSync Premium is active on the EX2780Q, typically triggered by frame rates swinging near the bottom of the variable refresh range, uncapped/erratic FPS, HDRi or Vivid modes fighting the adaptive-sync engine, or an outdated GPU driver. Fixes in order: disable FreeSync to confirm, cap FPS inside the 48-144Hz range, use DisplayPort, update the GPU driver, tone down HDRi/vivid settings, then firmware-reset if it persists.