Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 41)

Diagnostics and Troubleshooting
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7.2 Troubleshooting Display Problems
This section contains some symptoms that may be encountered in the displays. This list does
not include every possible symptom or solution but does represent common situations and
simple steps to resolve them. The solutions are given in priority order so try the first solution
first.
Troubleshooting may require removal and replacement of modules. Refer to Section 6.1 for
instructions on this procedure. When replacing modules, make sure that the power and
signal cables are reconnected correctly and the latches are tightly closed.
Module and LED problems
One or more LEDs are not lighting
• Check/replace the ribbon cables on the module.
• Check for bent pins on module jacks.
• Move the module to a different location.
• If that does not help, the module may need to be replaced.
One or more LEDs on a single module will not turn off
• Check/replace the ribbon cables on the module.
• Check for bent pins on module jacks.
• Move the module to a different location.
• If that does not help, the module may need to be replaced.
A section of the display is not working, all the way to the right end
• Check/replace ribbon cables from the last working module in the row to the first
non-working module next to it (Figure 35).
• Move or replace the first non-working module.
• Move or replace the last working module.
• Check that the power LED is on at the back of the modules.
• Make sure the power cable to the module is connected.
Figure 35: Modules Not Working