LCD Screen Test Guide
LCD panels use a backlight — bleed, glow, and banding are the main checks. Match your workflow to IPS, VA, or TN technology.
Start with essentials
Most laptops, budget monitors, and TVs are still LCD. Backlight uniformity and response time vary more than spec sheets suggest.
Glow shifts when you move your head; bleed stays fixed. Learn the difference before requesting RMA.
High contrast VA panels often smear in dark game scenes. Test before return window closes.
6-bit+FRC panels show steps in gradients. Grey ramps reveal what marketing omits.
Essential pixel and bleed checks first, then banding and motion for gaming panels.
Cycle white, black, and RGB. LCD stuck pixels behave like OLED — bright dots on black are most visible.
Dark room, max brightness, pure black. Mark fixed spots vs glow that moves with viewing angle.
Smooth grey and color ramps expose 6-bit panels. Check shadow and highlight regions separately.
If your panel is VA, run motion test on dark background. IPS usually passes; VA may show long trails.
Lightening at corners on black due to IPS cell structure — changes with angle, not a backlight defect.
Frame rate control dithers to simulate extra bit depth. Can cause flicker or banding on cheap panels.
On LCD TVs, zones dim backlight — can halo on Mini LED. Test with small bright objects on black.
IPS, VA, and TN need different pass thresholds.
Most laptops & office
Contrast gaming
Legacy
HDR TVs
Fixed defects vs normal LCD behavior.
Document angle-dependent vs fixed issues — retailers often confuse glow with bleed.
Only way to judge backlight leakage fairly.
If light moves, it is probably IPS glow.
Backlight color shifts in first 15 minutes.
For uniform bleed test, turn off dynamic backlight tricks.
Ghosting worst on grey-to-black transitions.
Shoot from straight on with room dark.
Both start with dead pixels and black screen. OLED adds burn-in; LCD adds banding and glow discrimination.
Rarely — it is panel hardware. Mild banding may be acceptable; severe steps warrant exchange.
TestMyGears covers color, greyscale, HDR, response time, and input checks in the browser. Every tool stays free to use.
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