Daktronics BLD Series, Service Manual

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Test and Replace Display Components
14
6 Test and Replace Display Components
Test a Module
Module Status Indicators
Under normal operation, module indicator LEDs
(one on each side on the back of the module)
should flash once every two seconds. Refer to
Figure 21 .
Note: When troubleshooting, it is important to
know that the module may take up to
eight seconds to change the pattern.
Perform a Module Self-Test
If a module is blank, but has power supplied to it,
perform a module self-test to diagnose a module
or SATA cable failure. To perform a self-test, follow
these steps:
Visit
youtu.be/M61KEMAOdaM to view a video
about performing a module self-test.
1� Attach a SATA cable to Port A and Port B on
the module. Refer to Figure 22 .
2� Disconnect the power to the power supply for
10 seconds.
3� Reconnect the power to start the self-test.
4� Verify the module is running a self-test.
Remove the SATA cable and cycle power to the
module to stop the self-test.
For more information, refer to
Performing a Daktronics Digital Billboard Module Self Test
(DD1944805) in Appendix A: Reference Documents (p�27) .
Replace Module Power Supplies
The power supply provides power from the power entrance to
the module. For BLD series digital billboards, the module power
supply is located on the uprights. Each power supply typically
controls 12 modules.
1� Disconnect the power coming from the power entrance to
the power supply.
2� Disconnect the power cables from the power supply to the
modules. Refer to Figure 23 .
3� While holding the power supply against the upright, rotate
the power supply bracket release tab counterclockwise off
of the power supply.
4� Gently lift the power supply assembly off the upright.
LED Status
Indicators
SATA
(Signal)
Jacks
Power
Jack
Figure 21: Labeled Module Back
Figure 22: Module Self-Test
Figure 23: Power Supply
Mounted to Upright