Hey everyone,

I'm going through an issue with a LW3 pin.

I just rebuilt the HV section, CN1 and the GI connector and keep it consistently shorts the F7 fuse when connected to the DMD display.

Any help on this one is appreciated.

Thanks
John

Thanks for responding, I'll post some photos tonight, but I wanted to give a little background info on the issue.

When I received this unit the DMD did not power, half of the backbox was lit, and the lights on the playfield were pulsing.

After opening the backbox, I noticed the GI cable was burned, The CN1 connector was burned and had pin 12 cut and they soldered the ground to the back of the power supply.

I have since pinned new connectors and replaced the cn1 wafer on the PS.

Here's a list of all of the items I've replaced on the PS:

C9
C6
C1
C4
D2
C3
D3
D7
C2
C8
C10
C11
C6
C7
R17
D10
D9
D11
TR1
TR2
D6
TR3
TR4
C14
C15
R16

I'll test the DMD connector tonight and will post my voltages.

When the DMD displays go bad do they typically short out the PS?

Sorry for the delay guys,

I managed to repair the fuse blowing issue by reseating all connections and soldering all header pins on the PS.

I also tested the DMD connector;

1 - -160
2 - -148
3 - Key
4 - Ground
5 - Ground
6 - 5V
7 - 12V
8 - 68V

Before, I wasn't getting any power on pin 8, I changed R15 and power came back on that end.

I still have no DMD power; but the pin 8 voltage is restored.

I've read that pin 1 should be -110 and 2 should be -98...with a 12v separation between the two.

I'm not sure if my voltages are too low.

any help is appreciated.

Thanks for the advice --

I just finished checking:

TR4
TR2
D10
D8
D7
R9
R10
R13
C11

I changed R10, because it had an erratic reading...when I pulled it off the board, it read fine.

I put a new resistor in and metered it and it was jumping all over the place.

The other components tested well, except for the zener diodes (D10,D8) as i'm not really sure how to test those diodes.

Thanks,
John