AMX Enova DGX 8 Instruction Manual page 163

Determining the Need for EDID Re-programming
Ideally EDID analysis will have been completed during installation specification. Consideration should be given
to the use of DXLink Output Boards and corresponding DXLink Receivers or DGX SC Optical Output Boards
and corresponding DGX SC Fiber Receivers which (in almost every case) will remedy incompatible source and
destination resolution issues. If EDID analysis was not possible but all of the system's devices are now available,
the most effective way to proceed is to test if the signal from each source device can be routed through the Enova
DGX Switcher to each of the destination devices. If they can be routed, then EDID re-programming is not
necessary.
A method of control is not specified in the following instructions. Any board you think might need EDID
re-programming must have the destination devices (and modules if applicable) attached before completing the
following procedure.
To determine if EDID re-programming is necessary:
1. Route the first input to all of the applicable outputs.
2. Check each destination display to verify that the picture is present, making note of any that are not.
3. Repeat Steps 1 and 2 for each of the remaining inputs.
Important: If any of the destinations do not display a picture, analysis or editing of the EDID data may be
necessary prior to using the EDID Programmer view in the DGX Configuration Software.
A variety of freeware tools can be found on the Internet to help with these tasks.
Board Support for DVI and HDMI Signals – Changing the Default EDID Setting
Another reason to re-program EDIDs is to support different source signals on a single board. Because each input
can be changed independently (e.g., an HDMI Board can support both HDMI and DVI sources), inputs can be set
up for specific sources or for the most common source device expected to be connected.
Note: HDMI-to-DVI or DVI- to-HDMI conversion requires an applicable conversion cable.
The EDID resolution and audio support variances between HDMI and DVI (which are provided as defaults) help
to identify if they need to change from the original (factory loaded) EDIDs on each input.
DVI Boards
The DVI Input Boards come pre-loaded with EDIDs typical for DVI output devices (computer monitors, etc.)
which do not support embedded audio signals. However, they will allow HDMI with embedded audio formats
through if the default EDID setting is changed via DGX Configuration Software using a file from the EDID
Library (see Option 2 below).
HDMI Boards
The HDMI Input Boards come pre-loaded with EDIDs typical for HDMI output devices (DVD players, etc.).
However, they will allow DVI formats through if the default EDID setting is changed via DGX Configuration
Software using a file from the EDID Library (see Option 2 below).
Options for Re-programming EDIDs
If EDID re-programming is necessary, use one of the following two options.


Troubleshooting Tip: If you have changed EDID from the default (which supports 2 channel L-PCM as
embedded audio) and are experiencing audio problems, it may be because you are trying to pass Dolby or
DTS or high PCM frequency rates and the destination device does not support them. If you are experiencing
video problems, it may be because you are trying to pass a video format that the destination device does not
support. In either of these cases, re-programming the EDID may help resolve the problem.
Instruction Manual – Enova DGX 8/16/32 Digital Media Switchers
Option 1: Install the DGX Configuration Software and open the EDID Programmer view. Read the EDID
from the output connected to the destination device and write it to the DXLink, DVI, or HDMI input
connector.
Option 2: Install the DGX Configuration Software and open the EDID Programmer view. Check the
AutoPatch_EDID_Library file at www.amx.com (search for EDID Library) to determine if one of the custom
EDID files meets the needs of the equipment. (The custom EDID files are variants of base EDIDs.) Open and
write the custom EDID file to the DXLink, DVI, or HDMI input connector.
Appendix A – DGX Configuration Software
163