(Topic ID: 196724)

Bally Centaur - Display Flicker

By dtown

1 year ago

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  • 9 posts
  • 5 Pinsiders participating
  • Latest reply 1 year ago by dtown
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#1 1 year ago

Problem - Bally 7 digit score display on player 4 is flickering. Almost like it's strobing brighter and darker throughout the segments.

What I've done already - I reflowed solder on the header pins along with the glass display pins. I've done continuity checks on all associated work. Everything checks out. I've tested the transistors which all fall within .5 to .6 ohms. All the resistors look fine. No burning. I've swapped connectors with the player 3 and it still does the same thing. Also, I've connected player 4's connector to player 3's display and no issues. The problem is isolated to this display. My final thought is that the glass is just shot.

I would appreciate any other suggestions prior to just ordering a new display.

#4 1 year ago
Quoted from ForceFlow:

There is a little bit of strobing, which is normal. But it isn't usually too apparent with the naked eye. It usually gets picked up on video footage, though.
However, if it's severe, then that may point to a voltage issue.
Has the driver board been refurbished?

The driver and mpu are alltek. I can plug the connector into any other display and it works fine. The problem is within the display or its board. The display technically works but gets dim then just slightly brighter but never as bright as it should.

#7 1 year ago
Quoted from Quench:

I suspect that display might have an issue with the display blanking signal. This signal blanks the displays every time they are refreshed (320 times per second) and can cause ghosting/extra brightness on the display if it isn't receiving/reacting to the signal.
Check the 20k resistor between pin 10 of the cable connector header and pin 7 of the 4543 chip on the display board. It could be the 4543 chip itself.

Tested fine. Other than taking the chip out and testing it in one of those cheapo chip testers (which sometimes work and sometimes don't), I don't have the tools to test a chip.

Quoted from PinballManiac40:

Can you post a picture of the .156" header pins? Suggest you change them as there can be some tarnished pins.

Look pretty clean.

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#9 1 year ago

Issue resolved. It was the 4543 chip. New one socketed and installed. Thank you to all that responded. Saved me from buying a Pinscore.

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