The Problem: (image attached) Display lights up every light but you can still see the actual game play and messages. This is the second time the machine has done this. I replaced the driver board with a new one from Rottendog and and installed new ribbon cables and a new known working display from another machine. The new display board worked when installed but failed after a couple hours. Rottendog was cool enough to bench test it for me and the fix on the display board was the LM337 voltage regulator damaged. Rottendog fixed and returned to me the fixed working display board.

The twist: I also had a F112 fuse blown during all of this. Not sure if this was related or not. I checked BR1, BR2, and BR3 and all tested 400-600. I narrowed the fuse problem to either a light by the magnet on left side or the ball motor. I disconnected boththe light and the ball motor and the fuse does not blow. I then re-installed the fixed display board from rottendog and the display worked perfectly for about two hours. All the lights are back to fully lit and the f112 fuse has NOT blown.

The low voltage at display are normal and high voltages at the display measure 158v, 141v, G, G, and 69V. Machine has full LED kit so there is a lower amp load.

The Future: That is all i can think to add for now. Buy a color Display if you guys think it would bypass all this and not get damaged. OR I am going to set fire to it, OR I receive a miracle fix on Pinside OR trade toward a newer machine Thanks in Advance for any help.

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The Measurement on J605 is 121v AC (on left of your diagram) and 96v AC (on the right of your diagram)

That is a definitive guide to fixing this machine. Thank you. I read through the entire guide and couldn't really pinpoint my display issue. The jumper on my power looks correct for 120AC. I did test the male pins on the display DMD board vs. the readings at the display. Voltages at the display measure 158v, 141v, G, G, and 69V and the readings at the male connections of the DMD board were 160v 100v, G, G, 75v.

Could this problem be isolated in the power driver board? if so is it easier just to buy a new replacement board and move on?

Thanks,

The Main AC measurement at where i have the machine powered is 118.5vAC. The measurement at TP1 is 15.97vDC

Is my next move to replace the power supply and or transformer?

so...to test the secondary voltages...not sure exactly how to do that...sorry above me...a couple pictures of the jumper and harnesses out of transformer.

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Just updating the fix I had on this issue. After hours of frustration, I took it to Doc Pinball in Indiana. Highly recommend Mark Wagner over there. Something in the power supply was telling the machine it was wired for 100AC. This indicated the machine may have spent time outside of the US. This problem was not located in the jumper area where I thought it might be as it was configured correctly for USA. Also see pictures...

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