I'm no expert on this, Tom maybe right, are you sure you used a simple momentary tac switch? you may have a short from the new soldering perhaps? eg a solder bridge.

How is it wired? faulty button matrix maybe? ie ghosting?

KB


My FLCS+TQS Conversion here on SimHQ

http://simhq.com/forum/ubbthreads.php/topics/4324940/1