Hello guys! I'm having this problem after playing a game on my BSD:

- I held a ball for about 10 sec on the left flipper, I heard a strange buzzing sound and after the throw I noticed it was at first fatigued on raising again and then didn't raise anymore.
- Into switch edge test i see that all the opto are acting strange (they go on and off alone all together) and the left flipper opto switch too is not registering when pressed.
- Since the previous owner installed a metal leaf switch on the right flipper board the right flipper works normally. I tried to swap the 2 flipper boards and as expected the right stopped working and the left is being activated.
- the left flipper however is acting strange, like it activates twice when pressed or sometimes it goes down even if the button is pressed..

On all the test points in the power board the voltage is right (12v are present);
The "mechanical switches" on the columns of the switch matrix work fine;
I have tested the 10 opto board on another pin and it works without problems..

please give me your help on diagnostic!! Thanks

Bump! Please help! All optos are flickering in switch matrix and flipper board optos doesn't register.. don't know where to look

Here is a short video of the problem!

For anyone who would have the same problem: After a power board swap with another pin the tp1 was finally showing a fault in the 12v unregulated circuit (about 5v instead of 12v). Replaced BR5 and C30 verified the continuity and now everything works fine.