Hi everyone, I have a nice TSPP I bought about 6 months ago, looks HUO, got it home, and everytime I turned it on to play it, on the second or third game the flippers would go dead, the ball would drain, the TV would not be normal, just a couple of random lines on it, after about 30 seconds it seemed like the coils got power again, it would kick out a new ball, and you could resume playing. For some unknown reason the game came with a Rottendog driver board installed, and I began to suspect it might be the culprit, so I bought a new Stern whitestar driver board 520-5137-00 Rev G and installed it. I have put a couple of hours on the game now, and the old problem has not resurfaced, but a new one has, it now has a pretty loud hum from all 3 speakers, that definitely was not there before. I tried my best to research this, and came up with people talking about the CPU/Sound board having resistor value issues at 110 and 106. I checked my board, 520-5136-00 Rev E, and it has the resistor values that Stern had recommended changing on the boards when Monopoly came out. So I really have no idea what to check or do next. All help greatly appreciated !!

I called them this morning, explained everything, the only advice the tech offered was to check that there was 12 volts coming out of the driver board to feed the CPU/Sound board.

The only mod is a short led strip above the drain in the middle of the apron.

So I swapped the Rottendog driver board SDB004 back into the game, and the loud hum from the speakers is gone. So I am convinced that there is something wrong with the new Stern driver board, not sure if I can return that to Marco's or not. I began to play a couple of games, and like clockwork, on the second game all of the coils quit working. One thing I noticed this time, was that there was a red LED next to U210 on the driver board that went out at the same time, and came back on when the coils started working 45 seconds later. Can anyone shed some light on this?

Thank you for your response, I will do some more digging...

So as it turns out, the Rottendog board, apparently manufactured in 2014 had a design flaw, and required a jumper between pins 3 and 4 on U210. Nice easy, quick fix. It now works fine and the problem with it (all coils suddenly going dead) is gone. Now I am left with a brand new Stern whitestar driver board that works fine, just causes a fairly loud speaker buzz or hum in all 3 speakers. I have swapped the 2 boards back and forth a few times, checking things. No loud buzz/hum with the Rottendog board installed, but with the new Stern there is. Marco will not refund or exchange it, told me to call Stern. Talked to Stern once last week about it, didn't really get far, going to try them again.