(Cross posted to RGP)

So I have a very strange issue on my GnR.

Magnets will not work in test. However, when in game play, the lower
right magnet will pulse 2-3 times, and then no more magnets! All
fuses test good.

Now I did recently add in a cold cathode tube that I tapped the 12v
for at an unused plug by the coin door. I thought this might be the
issue and unplugged the mod. No difference. Doesn't come up in test,
same magnet pulses 2-3 times, then no more magnets!

I also have an extra magnet board, and swapped that in place to see if
possibly the board was the issue. No change in the outcome.

No clue what to start looking at next. The magnet board schem. used
to be up on ipdb, but seems to have been removed.

ANY help would be awesome! (Checked RGP google archives, haven't
found anything that comes even close to this problem.)

I did, but they gave some weird readings. Not too sure if I tested them correctly (the are FET transistors)

I will be adding in the capacitor fix, and probably just replacing all 3 transistors to be safe.

Buzzed out the magnets, all came back around 4.8ohms.

All transistors and associated diodes tested OK.

Will be buying a .27 UF capacitor and some breakers tomorrow to allow further testing without going through my fuses.

Oh yes, I have both the Mad Amusements replacement board, and an original. The problem seems to happen on both. Did not have this problem when I tore it down in Oct, but I have moved since then, and everyone knows how common it is to have something happen when ya move!

Update:

Added capacitor in. Game blows f5 fuse on PPB almost immediately when any magnet activity happens, BUT only if all 3 magnets are fused (IE....ready to work). Any combination of one magnet or 2 magnets, no problem. I add in a 3rd...BAM! Blows f5 (no magnet fuses pop)

No idea what this means, but at this point I am leaning towards something on the PPB board. No issues with the wiring or the connector pins. All solder joints are good, no corrosion, etc..

I missed some solder spots. Rob Anthony found em and fixed em at pagg!

Let me stick the replacement board in and see what I can come up with