Optoma WHD200 Manual page 22

intermittent video.
No audio.
IR Blaster can't control
Source device.
"Supported Resolution" chapter where the video frame rate from
your HD AV device WHDI DEVICE can support is defined.
 Ensure the transmission distance is less than 66 feet (LOS).
 Check your TV's volume is properly set and not set in "MUTE" mode.
 Check if your source player's audio volume has been turned up..
 Ensure the bit rate of audio from the source device can be supported
by WHDI DEVICE. Please refer to the details in Chapter 6, Audio Bit
Rate Support.
 Check where is IR sensor of Source device. Make sure IR Blaster
sensor is close and straight to Source device's IR sensor. Please refer
Chapter 3, step 3 for reference setup.
Change IR Blaster frequency to meet Source device's requirement.
See the page 20 for the IR blaster frequency switch.
20