Maintenance and Troubleshooting
27
Problem Observed
Possible Cause
Solution
One line of modules does not
respond properly. LEDs are
garbled, do not change, are too
bright or too dim, etc.
One or more wires or
terminals in the signal cable
(for this line) is misplaced,
open or shorted to wires or
frame, in display,
VFC-3000 controller, or
control cable from display to
VFC-3000 controller.
Repair wires as needed.
Terminating resistor on the
CAN bus for this line is bad.
Replace the terminating
resistor.
One or more drivers in this
line are bad.
Replace modules in the line
one at a time and retest each
time.
Note:
There may be
more than one bad driver.
Repair the failed driver.
CAN distribution board is
bad.
Replace CAN distribution
board.
No LEDs on a module light.
Power connector unplugged
at module.
Plug in connector.
Address and signal connector
unplugged at module.
Plug in connector.
Power plug terminals are not
properly seated, or the wire is
bad.
Inspect all wires and terminals
for power plug. Repair as
needed.
The driver is bad.
Replace failed driver.
One module is garbled, too bright
or too dim, erratic, etc.
Signal plug terminals are not
seated well at driver board, or
wire is bad.
Inspect all wires and terminals
for 8-pin plug. Repair as
needed.
The driver is bad.
Replace failed driver.
One pixel does not turn off.
The driver board is bad.
Replace failed driver board.
The pixel board is bad.
Replace failed pixel board.
One pixel does not light.
The pixel board is bad.
Replace failed pixel board.
The driver board is bad.
Replace failed driver board.
One string (half the LEDs) in one
pixel does not light.
The pixel board is bad.
Replace failed pixel board.
The driver board is bad.
Replace failed driver board.
