Troubleshooting - Extron electronics Distribution Amplifiers DVI DA4 Plus User Manual

Installation and Operation, cont'd

Troubleshooting

No output signal — Check that the front panel LED is on
(amber shows that the unit is receiving power, green shows that
it is also receiving an input signal). If LED is not lit, check the
power supply and/or video input connections to the unit (see
page 2-6).
No output signal or poor quality signal — Check the integrity
of the cabling from the source device to the distribution
amplifier and from the distribution amplifier to each of the
display devices.
DVI signals run at very high frequency and poor connections
can cause degradation or loss of the signal, or jitter.
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Display device displays a flashing black or blue screen, snow
or other distortion — A device that is not HDCP compliant may
be receiving HDCP-encrypted signals.
The DVI DA Plus series distribution amplifiers are not
High-Bandwidth Digital Content Protection (HDCP) compliant.
Signal on some displays but not others — Reboot the source
device.
When the source device boots up, the distribution amplifier's
EDID handling feature ensures that the output resolution of
the source device is matched to the requirements of the display
device with the lowest resolution.
If an additional display device is added, which requires an even
lower resolution, the image will not be displayed correctly on
that monitor until the source device is shut down and rebooted.
At that time, the distribution amplifier's EDID handling
will ensure that the output resolution of the source device is
recalibrated to meet the needs of the additional display device.
DVI DA Plus Series • Installation and Operation
2-12
S ignal transmission distance can vary greatly and depends
on signal resolution, cable type, cable quality, graphics card
and the display used in the system.
Use only cable that is designed for DVI signals.
Limit or avoid the use of adapters or couplers.