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Author Topic: Bally Alpha S9000 upper screen flicker/changes tint  (Read 160 times)

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Offline stlscott

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Bally Alpha S9000 upper screen flicker/changes tint
« on: May 14, 2024, 12:26:20 PM »
I have a Bally Alpha 9000 Quick Hits.  I've tried different cables, plugged and unplugged all cables at the MPU and the monitor, pulled out the MPU and pushed it in securely - seems tight (all while powered off of course), and still get the occasional flicker.... seems to happen early in the process, meaning in the first 10-20min the machine is on.. then it seems to go away... almost like a cold solder or something...
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Offline dailey

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Re: Bally Alpha S9000 upper screen flicker/changes tint
« Reply #1 on: May 14, 2024, 05:06:07 PM »
I had a similar issue with my S9000. Occasional monitor flickers that drove me nuts. Sometimes the colors looked faded. It turned out to be the VGA cable connection to the front of the MPU. I could flex the cable and produce the flicker. I was going to replace the cable, but reseating it solved the problem and I haven't seen a flicker since.

Your cause may differ, but it looks like you're checking all of the obvious things.

Offline stlscott

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Re: Bally Alpha S9000 upper screen flicker/changes tint
« Reply #2 on: May 15, 2024, 12:24:45 PM »
I had a similar issue with my S9000. Occasional monitor flickers that drove me nuts. Sometimes the colors looked faded. It turned out to be the VGA cable connection to the front of the MPU. I could flex the cable and produce the flicker. I was going to replace the cable, but reseating it solved the problem and I haven't seen a flicker since.

Your cause may differ, but it looks like you're checking all of the obvious things.

Thanks for the info, maybe I will try some ectronic contact cleaner on the VGA connections.  As an I.T. I have seen VGA connections do that for years, so it makes sense... reseating didn't resolve it but maybe this cleaner will.
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Offline rickhunter

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Re: Bally Alpha S9000 upper screen flicker/changes tint
« Reply #3 on: May 15, 2024, 10:11:44 PM »
The caps on your A/D board might be going bad.  Recapping the A/D board often solves flickering and the no-input problem.
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Offline stlscott

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Re: Bally Alpha S9000 upper screen flicker/changes tint
« Reply #4 on: May 16, 2024, 05:55:50 PM »
The caps on your A/D board might be going bad.  Recapping the A/D board often solves flickering and the no-input problem.

I'm still learning the Bally S9000 machines, which one is it and where's it located?  On teh back of the LCD would be my assumption but I have been burned by that before... lol
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Offline rickhunter

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Re: Bally Alpha S9000 upper screen flicker/changes tint
« Reply #5 on: May 17, 2024, 12:05:07 AM »
The little board where the input plugs for the monitor is the A/D board.  Basically it converts the VGA signal (which is analog) to a digital signal so it can be displayed on the digital screen (which is essentially any lcd/oled panel).  The fact that as it warms up, the signal becomes steady usually points to bad caps.
If you find the site helpful, consider becoming a contributing member.  It pays for costs and keeps this site alive.  I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

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Re: Bally Alpha S9000 upper screen flicker/changes tint
« Reply #6 on: May 17, 2024, 01:30:21 PM »
The little board where the input plugs for the monitor is the A/D board.  Basically it converts the VGA signal (which is analog) to a digital signal so it can be displayed on the digital screen (which is essentially any lcd/oled panel).  The fact that as it warms up, the signal becomes steady usually points to bad caps.

Hi Rick, thank you for the information, that was exactly what I was looking for!  Once I get this MPU issue resolved (see my other post), I will disassemble it and replace the caps.  It's always the caps, is't it??? LOL
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