Troubleshooting
Symptom Probable
Causes
Possible
Solutions
Change the screen refresh rate of the video
source to the next higher or lower setting
Image distorted or
skewed
Adjust the
Sync Adjust
switch on both the send
and receive baluns
No image
Weak or distorted
sync signal
Attach or detach the grounding screw on either
or both of the baluns to earth ground
Reversed polarity
Unusual colors
Bad RJ45 crimp
Verify RJ45 pinout conforms to EIA/TIA 568A
or 568B standard. If not, re-crimp the cable.
Verify cable grade and total cabling distance
Reduce the screen resolution
Smearing or weak
video contrast
Exceeded cable
distance
Reduce the screen refresh rate
Attach or detach the grounding screw on either
or both of the baluns to earth ground
Horizontal bars
moving upward in
background
Verify the source and destination equipment are
at the same ground potential.
Shaking image
Ground loop
problem
Change the screen refresh rate of the video
source to the next higher or lower setting
Background pattern
EMI interference Identify
possible
radiating frequency sources and
isolate them from the cabling. Use shielded
twisted pair cabling.
