(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.

#2 1 year ago

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?

#3 1 year ago

I suspect you were on the right track with reflowing the headers on the displays, but there's two sides to every connector! The likely culprit are broken spring-clips on the female-side of the connector. They can be difficult to spot, but a cracked or bent spring-clip can result in a poor/intermittent connection, and the kind of flickering you are seeing. To find this, isolate it to which connector it is first by unplugging all but one display. No flickering? Not that connector. Add in displays until you see flickering. Then, you'll have to pull and inspect each spring-clip (there's a tool for this, but careful use of a jeweller's screw-driver can release the spring-lock and allow removal).

I'm not saying that this is positively the problem, but it is worth a look: This problem affected my F2K that had 6 or 7 broken spring-clips, and upon replacement, the game was solid.

#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.

#5 1 year ago

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.

#6 1 year ago

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

#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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#8 1 year ago

If you remove the orange wire from pin 10 at the display 3 connector, does the original good display 3 then exhibit the same/similar problem?

#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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