Start with a clean baseline
Separate enumeration, permission, actual video frames, active resolution/frame rate and source/capture format. 'Detected' is not the same as 'working correctly.'
Live evidence
Relevant checks
Webcam TestOpen your webcam locally to verify that the browser can access and display a live camera stream.
→Camera Focus Test ChartDisplay a high-contrast focus target and fine-line reference for visually checking camera focus behavior.
→Camera Exposure Step ChartDisplay dark-to-bright reference steps to inspect clipping, crushed shadows and unstable automatic exposure.
→Data Transfer Time CalculatorEstimate ideal transfer time from data size and an entered link rate.
→First sequence
Do the high-signal checks before risky changes
- 1
Confirm battery and memory-card state
- 2
Test the camera's own playback/menu functions
- 3
Use webcam-mode tests only if the camera explicitly supports that connection mode
Decision points
What the result should change
If live preview worksPrioritize the affected meeting/streaming app, selected source, virtual camera or profile.
If video works only at a lower modePrioritize cable/USB bandwidth, hub/dock topology or unsupported source mode.
If no frames arrive anywhereSimplify to direct connection, OS recognition and official firmware/driver guidance.
Browser can help check
- Test live video if the camera exposes a browser-visible webcam stream
- Provide focus and exposure reference targets
- Estimate media transfer time
Browser cannot prove
- Read shutter count generically
- Inspect sensor electronics
- Diagnose lens mechanics or camera firmware
Repair boundary
Know when to stop browser troubleshooting
- A browser cannot diagnose image-sensor electronics or lens alignment.
- Capture cards can be limited by HDMI format/HDCP/EDID even when USB enumeration succeeds.
- Do not install unsigned camera/capture drivers from download aggregators.
Used-device inspection
What to verify before paying or signing off a repair
- Verify the exact resolution/FPS modes you need
- Test microphone if integrated
- For capture devices, verify passthrough and capture are separate specifications