Power present; data unknown
This is a valid partial result—for example, USB-C PD may supply power while data remains untested. It does not prove the data path works.
Tous les tests
Fonctionne localementSans compteSans installation
TEST MATÉRIEL EN LIGNE
Test des Ports USB
Utilisez un appareil fonctionnel pour enregistrer et comparer les ports USB de cet ordinateur.
You confirm the physical port labels; KeyTest records the evidence.Browsers cannot discover connector count or map a device to a left, right or rear port. Use the editable plan below, then test each port with the same probe.
SET UP ONCE
Confirm this computer's physical ports.
Checking WebUSB…
- 1Testing now
- 2Waiting
- 3Waiting
CURRENT PORT
Record what happens.
1
Does the device receive power?Look for a light, charging indicator, fan, or startup sound.
2
Does this computer detect the device?Check Device Manager, System Information, or the device's normal behavior.
3
Browser check OptionalWebUSB is unavailable here; the two checks above are enough to record a result.
Record at least one result above.
PORT COMPARISON
No ports recorded yet
Complete the current-port form above, then save it. Your comparison will appear here.
RAPPORT DE DIAGNOSTIC LOCAL
USB port test résultat
Build the physical port plan and save one row for each connector.
- Planned ports
- 3
- Recorded ports
- 0
- Passed
- 0
- Partial / unknown
- 0
- Need review
- 0
- Port results
- None
Ce que ce résultat confirmeThe recorded manual power and operating-system observations for each named physical connector, plus any browser-visible USB metadata that was available.
Ce qu’il ne peut pas prouverFull electrical compliance, sustained transfer speed, cable quality, USB Power Delivery profiles, hidden device classes, or connector location without the tester's physical labels.
One port fails consistently
If the same known-working probe succeeds elsewhere, the failing port or its internal path deserves inspection.
WebUSB cannot see it
This is common for protected device classes and does not by itself mean this computer's port is faulty.
This workflow tests the USB host ports on the computer running KeyTest. Results stay in this page and reset when it is reloaded.
À PROPOS DE CE TEST
Des réponses rapides sans installer de logiciel.
Utilisez un appareil fonctionnel pour enregistrer et comparer les ports USB de cet ordinateur.
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.