3.0 A single segment of a LED digit does not light up
3.1 When a single segment of a LED
does not light up, the cause is very likely because one of
the 4 LEDs that makes up the segment, is failed. Since the LEDs are connected in a series, if one of
them has a fault, this will interrupt the current in all the other LEDs.
For technicians who want to try to repair the LED electronic board, please see paragraph 3.2.
To order a new LED electronic board, please see
7.2.
3.2 Often, the LED has no faults, but the problem is due
to a contact of one of the 4 LEDs of
the segment, which has a defective soldering. If is not possible to see the defective soldering, we
suggest to review with a soldering iron all the 8 solderings (2 for each LED). The defective LED can
be found out, also, by short circuiting its 2 contacts: in this case the other 3 LEDs of the series will
turn on.
digit
paragraph
only
Pag.4
4.0 The information displayed on the
s not
correct
LED frontal i
4.1 If, on the LED frontal, there are several segments of LED which stay switched off or which are
lighting up incorrectly, we suggest to make a test of all LEDs visualizations.
To test the LEDs, see chapter 8.
4.2 By the Rows Test, check if all LEDs of each letter (for example all LEDs identified by the letter
)
. If there are some wrong
, that is, if LEDs
light up at the same time, or if some LEDs of the selected letter stay switched off, you should verify
if
have been carried out properly,
(see
paragraph 7.3).
If the
are in the correct position, please contact the supplier indicating:
1. The scoreboard model.
2. For each LED board which does not display the correct information, please indicate the number
identifying the board, and the letters which do not light up properly, or which stay switched off even
when they should turn on.
4.3
Columns Test,
. Also a light of 4 LEDs,
identified by the letter H,
. Different lights of 4 LEDs can be
turned on too, but each light must have a different letter.
1.
2.
4.4
Total lighting Test, ch
. If some LEDs stay switched off, we suggest
to open the scoreboard, by unscrewing the 4 screws on the back (see Fig.3 and Fig.4 on pag.2),
and verifying that all the electronic board connectors are well inserted.
If the problem is not solved, for each group of 4 LEDs which does not turn on,
.
"A" turn on correctly
visualizations
with different letters
the
on the LED boards with such troubles
By the
check if only one digit at a time turns on entirely
can be turned on together with a digit
If there are some wrong visualizations, that
is if 2 digits light up at the same time, you should verify if the
have been carried out
properly, on these LED boards (see paragraph 7.3).
If the
are in the correct position, please contact the supplier indicating:
The scoreboard model.
For each LED board that does not display the correct information, please indicate the number
identifying the board and the letters which do not light properly or which stay switched off even when
they should turn on.
By the
eck if all LEDs turn on
see chapter 3
solder jumpers
solder jumpers
solder jumpers
solder jumpers
