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Author Topic: Williams Firepower  (Read 3134 times)

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pbj

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Williams Firepower
« on: May 22, 2017, 10:35:11 pm »
Symptom - lower left segment missing from players 1 & 2 and ball/credit displays.



So that means the problem isn't display glass, took a look at the board, and we've got a crispy resistor.



Replaced it with a half watt flame proof...





And.... There....we.... Go.

« Last Edit: May 22, 2017, 10:43:01 pm by pbj »
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pbj

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Re: Williams Firepower
« Reply #1 on: October 17, 2020, 07:17:37 pm »
3.5 years later, same segment went dead again and took its friend top segment with it.

Replaced the resistor again and that segment was resolved.

Top segment was a little weird, resistor looked and tested okay.  Reflow of everything did nothing.

I looked at the schematics and saw there are two chips that player 1, 2, and ball/credit have in common.  I looked over a data sheet and noticed this game only uses 6 lines of the 7 segment driver.  (No commas)  so I jumped the dead input and output to the respective unused pins.

Replaced the resistor because why not.

Lasted about five hours before an entire digit on player 2 and 4 disappeared.   :lol

More drama, next post.
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jennifer

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Re: Williams Firepower
« Reply #2 on: October 18, 2020, 12:11:36 am »
That is one of my grail machines that has always alluded me...Clever, using that unused driver, but curious the way it keeps taking out that resistor...The voltages check out?... If I had to guess, I would be thinking one of those chips was getting hot, partially shorted, or drawing through a dirty/burnt socket and drawing a little extra current.
« Last Edit: October 18, 2020, 12:33:07 am by jennifer »

pbj

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Re: Williams Firepower
« Reply #3 on: October 18, 2020, 12:25:32 am »
Itís one of my favorites, and Iím horrible at it.  This was a rescue out of a puddle of mud in San Antonio over a decade ago.  I got tired of chasing gremlins on the mpu and driver board and bought replacements from pinballpcb.  Iím not entirely happy with what I received or how Iíve been treated post sale, but the boards do work.

That backglass is missing most of the colored ink, so what youíre seeing is a bunch of colored transparencies glued to the back.  Cabinet was missing 90% of the black so I rattle canned it back.  This is a polished turd.  Iím probably in for $1,500 at this point and Iíll never get it back out of it.

Anyway, a reflow on the strobe pins in question and cleaning the edge connector got my missing digit back.

 :cheers:

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jennifer

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Re: Williams Firepower
« Reply #4 on: October 18, 2020, 12:42:28 am »
You would never know it, it looks good from here.😁...Ah crusty connector, glad you got it sorted out.