Use Case Studies - Lightware UCX Series User Manual

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9. Troubleshooting
9.1. Use Case Studies
Symptom Root cause
Device(s) not
powered properly
Cable connection
problem
No incoming
signal
Not the proper
video port is the
active one
No picture on the
video output Not the proper
interface is the
active one
Output port is
muted
Display is not able
to receive the
video format
HDCP is disabled
No picture on the The source sends
video output + 4K signals, but the
signal error rate emulated EDID is
is high, HDMI2.0 not supported this
scrambling is resolution.
disabled, clock
rate is set 1:10
Action
Video layer
Check the switcher and the other devices if
they are properly powered; try to unplug and
reconnect them.
Cables must fit very well, check all the
connectors.
No video signal is present on the HDMI input
ports. Check the source device and the HDMI
cables.
Check the video crosspoint settings.
If the source/display has more connectors,
check if the proper interface is selected.
Check the mute state of output ports.
Check the emulated EDID and select another
(e.g. emulate the display's EDID on the input
port).
Enable HDCP on input port(s) of the switcher.
Check the emulated EDID and select another
(e.g. F139 EDID on the input port).
Applied firmware package: v1.1.0b7 | LDC software: v2.5.4b3
UCX series – User's Manual
Refer to Symptom
4.6
4.6
4.6
3.1.1
No 4K60 video
LW3 7.5.1
signal on the
USB-C input
LW3
7.5.4
6.8.1
LW3
7.11.4
6.6
LW3 7.5.12
6.8.1
LW3 7.11.4
Root cause Action
The source is Check the documentation of the source, and
not able to send the ability of the connected port. Certain USB-C
4K60Hz ports are only for power and not for video
transmission. The icons beside the port can
help.
The source PC or Check the source resolution and modify it, if it is
BYOD resolution is necessary. Certain sources require restart.
not 4K60Hz
The USB-C cable is The USB-C standard allows two cable types: the
not appropriate Full-Featured Type-C Cable Assembly or 2.0
Type-C Cable Assembly. The latter one will not
operate with 4K60Hz.
Always use high-quality cable. The noname USB
3.1 Gen1-compatible cables could use only 2
SS channel instead of 4. The minimum cable
requirement is USB 3.1 Gen1-compatiblity and
supporting Displayport HBR2.
The active Thunderbolt3 cable is not
appropriate because it is not compatible
backwards (with USB 3.x or DP). The passive
TBT3 (20Gbps) cable could be proper when it
supports USB3 Gen1 or Gen2 and Displayport.
Not proper Check if the DP Altmode Policy is set to Prefer
Displayport video (Force C).
alternate mode
setting
90
Refer to
4.5
4.5
4.5
6.7.1
LW3 7.10.2