Thats fustrating. Maybe change the 12v Bridge rectifier. top left on main driver board. It supplies the power to optos. Mine was bad and now no issues.

I had the same problems. Replace the optos, tested etc. Decided on using this below and I have not had any problems.

http://www.homepin.com/bsd.html

That board MUST to be good, Aussie made!!

Before rushing out and buying anything, the connectors are crap on BSD, I would re-make the connections on the female plug, pull the wire out and move along ½ inch. With my machine after you unplug and replug a few time the sleeves in the female sections stop making contact with the male pin. In test mode and no ball in place try wiggling the plug see what happens, you don’t want to buy something and still not work. Apart from L1 the 24opto board is fairly bullet proof.

The BSD 24" long opto board that I make is a complete redesign. It operates on a totally different principle to the original.

The original transmits & receives a radio frequency while my board uses audio. This means I can use different chips that are readily available. The original chip is unobtainium anywhere and the coil (choke) is also a critical component that can be tricky to find.

To date over 150 of these replacement boards are being used all over the world with fantastic reliability being reported.

Certainly start by reflowing the connectors and then check that the thin wires from the choke are not broken. Even if one is broken off close to the body you can sometimes dig away the coating and solder to the remaining stub.

Failing that there is little that you can do. The optos give very little trouble - it is generally the I.C. that fails on the board.

Thanks for your purchase Spraynard. I'm very pleased it sorted out your issues.

After numerous, strange mist / opto problems, I used the home pin board. My mist ball problems are over. Bulletproof!

How much is the board?

Full details here:

http://www.homepin.com/bsd.html