IBU2 strange IR problem
 

I pride myself in being able to do just about anything with the IBU2 series of TCBs however I developed a fault I can’t seem to solve.

A unit that I recently installed from new, which tested good after install, has developed an IR fault.
The IR emitter is staying lit but dimmer than full pulse brightness.
It does not pulse or flash when IR is fired, it just stays constantly dim.
The tank receives hits shot at it but will not fire.

I have changed to a stock Tamiya harness and emitter as well as removed SD card and reseated it and changed the jumper for repair tank and replaced it.

Anyone have ideas if I can resolve the issue so I don’t have to scrap out another IBU2 board.