What to Do When Computer Screen Mirroring Fails? A Complete Guide to 5 Common Problems and Solutions
“Why did my computer screen mirroring fail again?” – Many people feel helpless when faced with issues like failing to connect, screen stuttering, or no sound. This article systematically summarizes the 5 most common problems and their solutions for computer screen mirroring failures, helping you quickly troubleshoot and resolve them.
Problem 1: Cannot Find Screen Mirroring Device
Cause Analysis:
-
Devices are not on the same network.
-
The receiver’s screen mirroring function is not enabled.
-
The router’s “AP Isolation” feature is enabled.
Solutions:
-
First, confirm that your computer and TV/projector are connected to the same Wi-Fi network.
-
In the TV settings, enable “Wireless Screen Mirroring,” “Multi-Screen Interaction,” or “AirPlay” function.
-
Log in to your router’s administration page and disable “AP Isolation” or “Guest Mode.”
Problem 2: Screen Mirroring Connects Successfully, but the Picture Stutters and Has High Latency
Cause Analysis: Insufficient network bandwidth or signal interference.
Solutions:
-
Move devices closer to the router, or connect to the 5GHz Wi-Fi band (less interference).
-
Pause high-traffic operations on your computer (such as downloads, online videos).
-
Restarting the router can sometimes significantly improve network quality.
Problem 3: Screen Mirroring Has Picture but No Sound
Cause Analysis: Output device is not correctly switched.
Solutions:
-
On your computer, click the “Speaker” icon in the lower-right corner of the taskbar.
-
In the list of output devices, select your mirrored device (e.g., “XXX-TV“) as the default playback device.
Problem 4: Mirrored Screen is Incomplete or Resolution is Abnormal
Cause Analysis: Mismatch between the computer’s and display device’s resolution or scaling.
Solutions:
-
In your computer’s “Display Settings,” adjust the external monitor’s resolution to its recommended value.
-
Also, check and adjust the “Scale and layout” percentage.
Problem 5: Prompts “Connection Refused” or Requires a Password
Cause Analysis: The corporate network or receiving device has security policies set.
Solutions: Contact your company’s IT administrator to obtain screen mirroring permissions or the screen mirroring password.
By troubleshooting according to the above checklist, most computer screen mirroring problems can be resolved. If the problem persists, try restarting all devices; it’s often the last resort for stubborn issues.