Measure for a short between Columns 1 and 8. It could be that somehow they have shorted together causing this problem. If you do find them shorted, then remove the lamp matrix plugs from the Driver board and measure again. This way you'll know if it's in the cabinet or on the board.
Hi Owen
Will pull that lamp and report back.
Excuse my ( well stated ) ignorance in regards to most things electronic……….but how do I measure for a short between columns 1 and 8 ???
No probs Wotto, I sorta guessed that from an earlier post when you asked if it was 'open'.
OK, set your multimeter to continuity test. This is the one where if you touch the probes together, the multimeter will "beep".
Then, place one of the probes on a column 1 wire, and the other on a column 8 wire. If it "beeps" then you have a "short circuit' or "short". If it does not then you have an "open circuit" or "open" - this is what it should be.
If you do find it short, then follow my earlier instructions...
(If you do not have continuity test on your meter, then let me know as there are other ways of doing this)
