(Topic ID: 58049)

Shadow display voltage problem

By ArcadeUpkeep

8 years ago

Topic Stats

  • 9 posts
  • 4 Pinsiders participating
  • Latest reply 8 years ago by johnwartjr
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#1 8 years ago

Hello all, I have a Shadow who's display went out. I measured the voltages at the connector on the display and they weren't correct so I ordered a HV rebuild kit from Great Plains and just installed it. The voltages are still wrong and haven't changed from where they were before I rebuilt it. Don't read that wrong, not a slam on them at all, great kit at a great price!

The voltages are:
-125 is -115
-113 is -93
+5 is good
+12 is good
+62 is +4 with the display connected or 0 with the display disconnected

Plugging in or unplugging the display made no difference to the other voltages.

I read somewhere that the -125 and -113 can be different but they have to be 12 volts apart, mine is 22 and didn't change when it was rebuilt.

Any idea what I can look at or what it might be? Oh and what should I look at for the 62 volts also?

Thanks in advance!

#2 8 years ago

Have you swapped the display into another machine to make sure the display works?
Have you checked the DMD controller?

#3 8 years ago

I haven't done that as I don't have another one in the shop to trade it with. But if the voltages aren't correct with the display disconnected it shouldn't matter should it?

#6 8 years ago

Someone has an idea, I know they do!

2 weeks later
#7 8 years ago

I finally got another machine to check the display in and it works fine. Kicks right on and is nice and bright so I assume it's somewhere in the power supply board somewhere but I'm not sure where. I've replaced everything included in the rebuild kit. Any ideas?

#8 8 years ago
Quoted from ArcadeUpkeep:

I've replaced everything included in the rebuild kit. Any ideas?

New part you put in defective. Or board has some issues. Through or a cross board continuity, bad solder joints.

LTG : )

#9 8 years ago

There's a trace in the +62 circuit, runs beneath R9, comes from one of the legs of BR1. It often gets broken from the heat of R9. If it breaks, you will have no +62

Hey there! Got a moment?

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