Symptoms
- Lighter patches or glow visible near screen edges or corners
- Most visible on a black or dark background in a dark room
- Not visible during normal daytime use with typical content
- Screen otherwise works and displays normally
Likely causes
- CommonNormal LCD backlight bleed from panel manufacturing tolerancesNearly all LCD monitors have some degree of bleed, more visible on darker panels or in dark rooms.
- PossiblePressure on the panel from mounting or the standAn improperly seated stand or wall mount can put slight pressure on the panel, worsening bleed.
- PossibleManufacturing defect beyond normal toleranceSevere, uneven, or clouded bleed covering a large area may exceed what's considered acceptable.
What to do
- Test in a dark room with a full-screen black image and check how much of the bleed is visible versus in normal lighting.
- Check that the monitor's stand or wall mount isn't putting uneven pressure on the back of the panel.
- Gently loosen and re-tighten any VESA mount screws evenly if wall-mounted, since over-tightening one corner can cause localized bleed.
- Compare against sample images online of 'acceptable' versus 'excessive' backlight bleed for your monitor's price range.
- If the bleed is minor and only visible in a dark room on black backgrounds, this is normal and not worth attempting further fixes.
- If severe, contact the manufacturer or retailer while still within the return or warranty window, since backlight bleed complaints are often handled as early defects.
Tools and parts
- None
When to call a pro
Significant backlight bleed discovered soon after purchase should be reported to the retailer or manufacturer for an exchange rather than repaired, since it's a panel-level manufacturing trait.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.