Had a similar issue and discovered a bad voltage read on the respective header pin relating to the column that was down. This info quickly isolated the issue to a board related fault for me.
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Quoted from anthony691:Were you able to work out what the board related fault was?
Yeah it was a chip/ic type 7406 that I was able to easily verify by swapping a good chip off the board for a quick determination. This was for a Williams fire power using kohout board with pull out type ic s.
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