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Quoted from GraniteStatePin:In other words the very top segment is constantly lit as 1 and 4 are the only numbers where this segment would be off.
This is segment a output from the 4543 (or 4558) from the BCD A2-D2.
Check for pulsing pins as indicated below.
If pin is pulsing it is probably the 7180. If the pin is not pulsing then check the BCD input pins (A2-D2) to do the differential diagnosis.
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