3 troubleshooting display problems, Common misconceptions, Module and led problems – Daktronics Galaxy AF-3500/3550 User Manual
Page 26: Troubleshooting display problems, Common misconceptions module and led problems, Daktronics
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Diagnostics and Troubleshooting
7.3 Troubleshooting Display Problems
This section contains some symptoms that may be encountered with displays. This list does not include every
symptom or solution but does represent common situations and simple steps to resolve them.
Troubleshooting may require removal and replacement of modules. Refer to
Section 6.2 for more
information. When replacing modules, make sure power and signal cables are reconnected correctly and the
latches are tightly closed.
Common Misconceptions
Blank display seen after boot-up
A blank display is normal after the boot-up procedure. When finished, the display is blank except for a
flashing pixel in the lower-right corner. The display is waiting for a message to be sent.
Module and LED Problems
One or more LEDs are not lighting
• Check/replace the ribbon cables on the
module.
• 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.
• If that does not help, the module may need to be replaced.
A section of the display is not working
• Check/replace ribbon cables from the last working module in the row to the first non-working
module next to it. Refer to
• Check the back of the modules to see that the power LEDs are on.
• Make sure the power cable to the module is connected.
• Move or replace the first non-working module with the one on the left of the non-working section.
• Move or replace the first module to the left of the non-working modules.
One row of modules is not working or shows a distorted message
• Check/replace the ribbon cables to and from the first non-working module.
• Check for bent pins on the jack going to a non-working module.
• Move or replace the modules that show distorted text.
• Move or replace the first module to the left of the non-working module.
Signal
Flow
Last
working
module
Signal
Flow
First Non-working
Module
►
►
►
daktronics
Galaxy
Figure 20: Modules Not Working