4K HDMI Switcher 4x1
PTN Electronics Limited 13 www.PTN-electronics.com
8. Troubleshooting & Maintenance
Problems
Causes
Solutions
Color losing or no video
signal output in HDMI
display
The connecting cables may
not be connected correctly
or it may be broken.
Check whether the cables
are connected correctly
and in working condition.
No HDMI signal output in
WUH4A while local HDMI
input is in normal working
state
Splash screen in output
devices
Poor quality of the
connecting cable
Change for another cable
of good quality.
Cannot control WUH4A by
control device (e.g. a PC)
through RS232 port
Wrong RS232
communication parameters
Make sure the RS232
communication parameters
are correct.
WUH4A is broken
Send it to authorized
dealer for repairing.
Static becomes stronger
when connecting the video
connectors
Bad grounding
Check the grounding and
make sure it is connected
well.
If your problem persists after following the above troubleshooting steps, seek further
help from authorized dealer or our technical support.
