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Chapter 5: Troubleshooting and Maintenance
5. Troubleshooting and Maintenance
Table 5-1. Problems, Causes, Solutions.
Problems
Causes
Solutions
Output image has snow-
flake pattern.
The connecting cable’s quality
is bad.
Failed or loose connection.
Try another high-quality
cable.
Make sure the connection
is good.
No output image when
switching.
No signal at the input/output
end.
Failed or loose connection.
The scaler is broken.
Check with oscilloscope
or multimeter if there is
any signal at the input/
output end.
Make sure the connection
is good.
Contact Black Box
Technical Support
at 724-746-5500 or info@
blackbox.com.
POWER indicator doesn’t
work or does not
respond to any opera-
tion.
Power cord connection failed.
Make sure the power
cord connection is good.
EDID management does
not work normally.
The HDMI cable is broken at
the output end.
Change to another HDMI
cable that is in good
working condition.
There is a blank screen
on the display when
switching.
The display does not support
the resolution of the video
source.
Manage the EDID data
manually to make the res-
olution of the video
source automatically com-
ply with the output reso-
lution.
Static becomes stronger
when connecting the
video connectors.
Bad grounding.
Check the grounding and
make sure it is
connected well.