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Author Topic: black screen vs confetti screen  (Read 1108 times)

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Offline smoothgrh

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black screen vs confetti screen
« on: February 11, 2022, 05:47:24 PM »
I'm used to getting the confetti screen when I put in an untested board — that usually means I need to re-seat some chips — but has anyone gotten a black screen when putting in a board?

What would be typical causes for this? The monitor is on, but there's no image.
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Offline firehawk618

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Re: black screen vs confetti screen
« Reply #1 on: February 16, 2022, 08:21:26 PM »
I'm pretty new at this but I've been doing lots of swapping of EPROMS / SIMMS on about 10 different 3902 boards and I have only come across the confetti screen.  Never a black one.

If you have more than one board perhaps try swapping parts from one to the other to rule out the board?
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Offline smoothgrh

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Re: black screen vs confetti screen
« Reply #2 on: February 16, 2022, 11:01:55 PM »
Thanks for the suggestion. I have two boards (they're 3802), so I'll
try swapping stuff.

One of the other possible issues is that I had to put in that center socket that the backplane plugs into. I'm wondering if the pins aren't aligned correctly.
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Offline Stayouttadabunker

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Re: black screen vs confetti screen
« Reply #3 on: February 17, 2022, 06:14:12 AM »
Quote from: smoothgrh on February 16, 2022, 11:01:55 PM
I'm wondering if the pins aren't aligned correctly.


.....or bent over ?
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Offline sixcardmark

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Re: black screen vs confetti screen
« Reply #4 on: February 17, 2022, 06:29:27 AM »
Also check the pins on MPU going to backplane.
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Offline Stayouttadabunker

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Re: black screen vs confetti screen
« Reply #5 on: February 17, 2022, 06:42:00 AM »
Quote from: sixcardmark on February 17, 2022, 06:29:27 AM
Also check the pins on MPU going to backplane.

oops...yep....that's what I meant... :duh:
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Offline firehawk618

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Re: black screen vs confetti screen
« Reply #6 on: February 18, 2022, 11:47:51 PM »
I only have 3902 but ironically enough I now have two boards that boot up with the key chip fine to the initial key menu then after hitting the jackpot key 3 times and swapping in the base chip the screen will go black and do real quick flashes of a thin bar of color vs the colored screens until it gets to the EPROM error screens as it's supposed to.

One of those two boards has issues and will display "WRITE STROBE ENABLED" and "CHECK AND REPLACE PROCESSOR BOARD".
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Offline Stayouttadabunker

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Re: black screen vs confetti screen
« Reply #7 on: February 19, 2022, 07:16:47 AM »
What colors are the LED lights on the MPU?
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Offline firehawk618

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Re: black screen vs confetti screen
« Reply #8 on: February 19, 2022, 10:52:15 AM »
Quote from: Stayouttadabunker on February 19, 2022, 07:16:47 AM
What colors are the LED lights on the MPU?

I didn't even bother to look.  I'll load a game on it and try again. 

Is there a document that shows what all those LEDs mean.?
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Offline Stayouttadabunker

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Re: black screen vs confetti screen
« Reply #9 on: February 20, 2022, 06:32:07 AM »
Some of it was mentioned in this topic if you do a web search.


http://newlifegames.com/nlg/index.php?topic=34342.msg184757#msg184757
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