DeviceOK
SearchCheck my device
Home / Device types / Smart TV
Smart TV diagnostics

Test what the browser can see. Know when it cannot.

Use visual screen/audio references and connection isolation to troubleshoot a TV without treating browser tests as a substitute for panel, HDMI or service diagnostics.

Run these first

Relevant live checks

Dead Pixel TestShow solid colors full-screen so you can visually inspect for dead or stuck pixels.
→
Screen Gradient and Banding TestDisplay smooth gradients to inspect visible color banding.
→
Screen Color TestDisplay full-screen red, green, blue, white, and black reference screens.
→
Left Right Speaker TestPlay left and right channel tones separately.
→
Screen Resolution TestShow browser viewport, screen dimensions, and device pixel ratio.
→
First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Separate built-in app vs HDMI/source problems

  2. 2

    Try another known-good source/cable for input issues

  3. 3

    Use TV self-diagnostics/service support for persistent panel/audio faults

What DeviceOK/browser can help check
  • Display reference patterns if opened on/through the TV
  • Generate stereo/channel audio tests
What this browser page cannot prove
  • Read HDMI handshake/eARC state universally
  • Run panel service diagnostics
  • Measure HDR/color accuracy professionally