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7 segment LED display pinout

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michal_w

New Member
Hi,
I'm trying to find the pinout for the following LED display: 7 segment, 4 digits, 30 pins. On the PCB is also lettering "FD-955AB" but there's no related with LED displays information in the internet.

Could anyone help?

Thanks in advance,
Michał
 
Last edited:

tronitech

Member
Try to light up the segments using a 9V battery with something like a 680R in the positive lead. It will be a common cathode or anode but once you've found out which is the common it should be relatively easy to map out the segment pins.
 

ronsimpson

Well-Known Member
Most Helpful Member
I have a multi meter that have a "diode test" that will light up a LED. Using the meter try combinations.

The LED module has many pins. Why?
Some modules have a pin out like this:
>7 sires for the 7 segments. a,b,c,d,e,f,g and 4 wires one for each digit. 1,2,3,4 They are arranged in a matrix.
>You might have (a,b,c,d,e,f,g 1,2) AND (a,b,c,d,e,f,g 3,4)
>You almost have enough pins to have 1(a,b,c,d,e,f,g) 2(a,b,c,d,e,f,g) 3(a,b,c,d,e,f,g) 4(a,b,c,d,e,f,g)
 

michal_w

New Member
Hi,
thanks for your replies.
I was hoping to avoid finding pins one by one, but I think it's the only way...
 

ronsimpson

Well-Known Member
Most Helpful Member
Please post your pin out when you find it.

I see your finger prints on the display. There are very few people who post their finger prints on the internet. lol
 
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