KeyTestDIAGNOSTIC DE L’APPAREIL
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Fonctionne localementSans compteSans installation

TEST MATÉRIEL EN LIGNE

Test d’Écran Externe

Vérifiez la sortie vidéo produite par cet ordinateur sur un moniteur ou téléviseur connecté.

MULTI-SCREEN CONNECTION LAB

Verify this computer can drive another screen.

Test one video-output port at a time with a known-working monitor and cable, then inspect the signal this computer produces.

READY TO CHECK

Use a monitor and cable you already know work.Connect them to the HDMI, DisplayPort, USB-C or dock output on this computer that you want to test. The known-working equipment acts as the probe.

DISPLAY TOPOLOGY— active
PrimaryExternalPosition reflects the operating system layout when available.
PHYSICAL OUTPUT RESULTS0 / 1 recorded

Name the exact port, adapter or dock path you tested. Browser display labels cannot reliably identify the physical connector.

CURRENT SCREEN—Reported resolution
AVAILABLE AREA—Excludes system UI
BROWSER VIEWPORT—Current content area
PIXEL RATIO—Display scaling
COLOR DEPTH—Browser reported

IF THE SCREEN IS STILL BLANK

Isolate this computer's output step by step.

The monitor and cable should be known-working before you judge the computer's port.
  1. 1

    Use known-working equipmentConfirm the same monitor and cable work with another source.

  2. 2

    Test one computer portConnect directly where possible, without a dock or adapter.

  3. 3

    Enable the external outputSelect the matching monitor input and choose Extend or Mirror in system settings.

  4. 4

    Compare another outputIf available, repeat with another port to isolate this computer's faulty path.

WindowsWin + P, then choose Extend or Duplicate.macOSSystem Settings → Displays → Detect Displays.ChromeOS / LinuxOpen system display settings and enable the connected output.

RAPPORT DE DIAGNOSTIC LOCAL

Test d’Écran Externe résultat

Run detection with a known-working monitor and cable, then record the physical output used in the notes.

Not checked
Active displays
Not checked
Advanced screen API
Not checked
Current screen
Unavailable
Detected labels
None
Physical output results
HDMI / video output 1: Not recorded

Ce que ce résultat confirmeWhether this browser session could observe multiple active display outputs after the manual connection was made.

Ce qu’il ne peut pas prouverElectrical health of every connector pin, cable bandwidth at every mode, or which physical output produced a detected display when the browser hides that mapping.

Detecting another screen confirms that this computer produced an output the operating system and browser could see. It does not electrically certify every pin in the tested port.

À PROPOS DE CE TEST

Des réponses rapides sans installer de logiciel.

Vérifiez la sortie vidéo produite par cet ordinateur sur un moniteur ou téléviseur connecté.

Limite du navigateur: Le diagnostic du navigateur fournit des indications utiles, mais ne remplace pas une inspection physique ou une réparation professionnelle.

Les données du diagnostic sont traitées localement et ne sont pas envoyées à KeyTest.