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Distribution Components

5 common video errors and how to fix them.

Digital HDMI and DVI formats provide sharp, crystal-clear image

quality. However, problems can occur. Here are the five most common:

Problem 1:

Black screen (no picture at all).

Possible cause:

A. Bad cable or cable that’s too long,

causing either the video signals or

EDID/HDCP control signals not to

be transmitted properly. Make sure

that you use quality, high-speed HDMI

cables—they don’t

even have to be expensive ones—or try an HDMI extender.

B. HDCP is unsupported. Does the display support HDCP?

DVI displays usually don’t.

Problem 2:

“

Sparkles” in the picture.

Usually caused by: HDMI cable that’s

too long or of inferior grade. The

solution is to use a video extender,

and/or buy quality HDMI cables from

a reputable supplier.

Problem 3:

RGB color tint.

Usually caused by: A color encoding

issue, a common problem when using

a DVI display with an HDMI source. If

you’re using a splitter or an extender

between your source and the link,

make sure it handles EDID. If possible, force the source (for instance,

a Blu-ray player) to output HDMI video with RGB color encoding

instead of Component (YPbCr) video encoding.

Problem 4:

White noise or “snow” on-screen.

Usually caused by: An HDCP issue.

This is actually what the encrypted

video looks like. It happens when your

display (or any active component, like

an extender, used in the transmission)

doesn’t support HDCP. The display, in turn, isn’t able to decrypt

the video stream. Be sure to use equipment that supports H DCP.

Problem 5:

Flickering or unstable image.

Can be caused by: Electromagnetic

or radio frequency interference, bad

cable, or cable that’s too long. These

all can cause issues with HDCP or the

signal, resulting in flickering or the

video randomly disappearing then reappearing after a second.

The solution: Use certified high-speed HDMI cables instead of

standard HDMI cables, or if you need to go long distances, try

an extender. If you’re already using an extender, try changing

to shielded CAT6 solid-core bulk cable.

For more troubleshooting products, go to blackbox.co.uk

Security, Optimisation,

and Troubleshooting

irewalls/data security equipment

To ensure data privacy, work with your IT department to implement

protection and safeguard your content. This is particularly important

if you’re using your AV distribution system to send video across a

hospital or government network and if you have to comply with HIPAA,

HITECH, PCI, or other data-protection standards

This may require establishing IPsec VPN tunnels between sites. Newer

technologies, however, enable you to establish an instant encrypted

connection between locations without the administrative hassle of setting

up a separate tunnel for each link. What’s more, these technologies don’t

add latency, which can bog down your video and data communications.

Skew compensators

Some video extenders are not designed to transmit video across cable that’s

higher than CAT5. In fact, with these extenders, the higher-grade cable may

actually degrade video. The problem is with the cable twists of CAT5e and

CAT6 cables; the wire distance that a signal has to travel is different for each

pair. This doesn’t normally cause a problem with data, but if you’re sending

higher-resolution VGA analog video signals across long cables, you may see

color separation caused by the signals arriving at different times. If the

extender you’re using doesn’t have built-in skew compensation, the remedy

is a device that compensates for skew. (NOTE: This applies only to VGA

analog signals and not to digital HDMI and DVI signals.)

Pattern generators

Use these to ensure video signal

reproduction and display are up to

par in your AV and digital signage

applications. They enable you to

generate test patterns to troubleshoot

video calibration issues. Pattern

generators are particularly useful for

testing in applications where accurate

video reproduction is important, such

as healthcare, biotech, educational,

and industrial settings.

Cable testers

In addition to pattern generators, you

can ensure a quality video infrastructure

by troubleshooting supporting cable

runs. With one of these handheld

testers, you can spot slow cables, bad

connectors, incorrect wiring, improper

lengths, and low signal levels from

switches, PCs, and other hardware

in your AV network. If you have a

qualification tester, you can also test

for available bandwidth and distinguish

between network and cable problems.

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