TCL Series Troubleshooting Guide
TCL Series 12-24VDC
Identify the Sign Problem:
Follow the owchart to diagnose the symptoms
Tools Needed:
Philips head screwdriver
Multi-meter
There are some
LEDs out
Pg
A message is lit
that shouldn’t be
2
Pg
The display is
ickering
3
Always turn off the power to the sign prior to opening the cabinet.
Disconnect the power wires going to the sign.
Note: Clear all metal
chips created by drilling
into sign cabinet.
Note: Do not overtighten fasteners or
distort back panel.
Pg
4
Note: Make appropriate wiring
connections per local codes.
Last Update: 07/19/18
The entire display
is out
Description of Normal Operation for the Sign’s Internal Power Supply
Diagnostic LEDs are included on the internal power supply to aid in verifying that input power is present and is being transferred to
the sign face through the output connectors.
+12V LED
This LED illuminates Green when 12-24VDC power is applied to the internal power supply’s input power pigtail.
Note: The transformer on the power supply converts 12-24VDC power to +12V.
A Output LED
Illuminates with power applied to Blue wire on the input power pigtail
B Output LED
Illuminates with power applied to Yellow wire on the input power pigtail
Pg
5
C Output LED
Illuminates with power applied to Red wire on the input power pigtail
Output Connectors
These connectors transfer power from the internal power supply to the sign face to
illuminate the individual message(s).
Input Power
Pigtail
C Output LED
Output
Connector B
B Output
LED
+12V
LED
Power Supply
Output Power
to Sign Face
Input Power
Pigtail Connector
Pigtail
Sign Face
Output
Connector A
A Output
LED
Problem: There are some LEDs out
TCL Series 12-24VDC
There are some LEDs out
< 10 LEDs Lit
Can you
YES
NO YES
measure the correct
incoming voltage
at the sign?
Last Update: 07/19/18
Please refer to the
diagrams on page 1.
NO
Check switches
and wiring
Entire sign
needs replaced
YES
Output voltage
is > 12VDC?
NO
Supply is
defective and
needs replaced
Contact sales with
the serial number
of the sign
Pg
2
Problem: A message is lit that shouldn’t be
TCL Series 12-24VDC
A message is lit that should not be
Do the
wires run
parallel to other
high power
devices?
NO
YES
Last Update: 07/19/18
Please refer to the
diagrams on page 1.
Run wires in
separate conduit
Is there
incoming voltage
on that
channel?
NO
Replace
power supply
YES
Recheck all
connections to
switches or
controlling system
Contact sales with
the serial number
of the sign
Pg
3
Problem: Display is ickering
TCL Series 12-24VDC
Display is ickering
Is the
+12V LED
illuminated
steady?
NO
Last Update: 07/19/18
Please refer to the
diagrams on page 1.
External power source may be AC
or it may not have adequate current
capacity to accommodate the sign’s
power supply inrush current
NO
YES
Is the
output connector
secure?
NO
Re-attach
connector
YES
Check switches
and wiring
Supply is
defective and
needs replaced
Contact sales with
the serial number
of the sign
Pg
4
Problem: Entire display is out
TCL Series 12-24VDC
Entire display is out
illuminated
Is the
+12V LED
steady?
YES
NO
Last Update: 07/19/18
Please refer to the
diagrams on page 1.
Is the input
polarity correct?
NO
Is the
output LED for
the aected message
illuminated?
YES
Is the
output connector
secure?
NO
YES
Can you
measure the correct
incoming voltage
at the sign?
YES
Supply is
defective and
needs replaced
NO
Check switches
and wiring
Contact sales with
the serial number
of the sign
Re-attach
connector
Pg
5
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