In normal operating conditions, the projector should not have a high pitched noise. Please connect the projector to different AC outlet and try to lower the refresh rate.

Projector:

  1. Check the video cables. Make sure the cable is securely connected and if possible change the cable. If using an LCD TV in Video mode, make sure the cable is connected to the correct input.
  2. Try another video input to see if the flickering is not just on one type of connection.
  3. Remove any devices that may cause interference, such as other projectors, TVs, radios, fans, electric clocks, etc.
  4. Connect the display to another computer or use another power outlet.
  5. Check the current resolution of the display and make sure that the video card or video source is compatible with the current setting that you want to display. Use the display settings recommended in the User Guide.
  6. In some cases, a fan in the projector could be the cause of the noise. A wire or some other object could be hitting the fan blades. Also, if the fan is making a “moaning” sound then it could mean that the bearings on the fan are starting to fail and the fan will need to be replaced.
  7. Change refresh rate in Windows, use instructions below:

Windows 8 and 10

  1. Right click on START --> CONTROL PANEL
  2. Double-click on DISPLAY
  3. Click "Change display settings" in right hand margin.
  4. Click on "Advanced settings"
  5. Click on "Monitor" Tab
  6. Under " Monitor Settings" is "Screen refresh rate"

Windows 7 

  1. Click on START --> SETTINGS --> CONTROL PANEL
  2. Double-click on DISPLAY
  3. Click "Change display settings" in right hand margin.
  4. Click on "Advanced settings"
  5. Click on " Monitor " Tab
  6. Under " Monitor Settings" is "Screen refresh rate"


Windows XP

  1. Click on START --> CONTROL PANEL
  2. Click on the "Switch to Classic View" in the left-hand menus if you are under Category View
  3. Double Click on "Settings" Tab
  4. Click on the "Advanced" button.
  5. Click on " Monitor " Tab
  6. Under " Monitor Settings" is "Screen Refresh Rate"


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