Glitchy Gunbird 2

PCB problems and fixes
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Stompp
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Glitchy Gunbird 2

Post by Stompp »

I have a Gunbird 2 PCB that's been working ok, but when I started it today the backgrounds looked strange in both attract mode and in stage 1-5. Stages 1-1 to 1-4 seems ok though.

Anyone got any idea what this might depend on? 5 V line is ok and I've tried pressing the IC's on the board but no success so far.

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Re: Glitchy Gunbird 2

Post by Asayuki »

From the look of it, it could be loose joints, but it could also be RAM, one EPROM or maybe some TTL.
EDIT: hard to say without making some measurement.
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Re: Glitchy Gunbird 2

Post by Stompp »

Asayuki wrote:From the look of it, it could be loose joints, but it could also be RAM, one EPROM or maybe some TTL.
EDIT: hard to say without making some measurement.
Thanks. I'm not in any way experienced when it comes to troubleshooting PCB's but I'm eager to learn :awe: Only tools I've got are a multimeter and a TOPS burner. I guess I should invest in a logic probe at least and then scour the Intertubes for some info on how to tackle this. It's gonna be a looong night :shifty:
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Re: Glitchy Gunbird 2

Post by zumbito »

Hi, any updates with this Gunbird?
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Re: Glitchy Gunbird 2

Post by Stompp »

Sadly no. I haven't had time to dig into this. I hope I'll have some more time during summer. Got a couple of boards needing to be looked at :roll:
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Re: Glitchy Gunbird 2

Post by zumbito »

Yeas, same here. Mine doesnt display the enemies sprites. I bought it as a replacement, so I think I will just ship it back. Have no time to figure it out.
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Re: Glitchy Gunbird 2

Post by Stompp »

Ah, yes in that case I'd ship it back as well. Mine on the other hand did work at one point but gave up some while ago :(
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Re: Glitchy Gunbird 2

Post by Hrvat9 »

zumbito wrote:Yeas, same here. Mine doesnt display the enemies sprites. I bought it as a replacement, so I think I will just ship it back. Have no time to figure it out.
Sell it to me !
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Re: Glitchy Gunbird 2

Post by zumbito »

Hrvat9 wrote:
zumbito wrote:Yeas, same here. Mine doesnt display the enemies sprites. I bought it as a replacement, so I think I will just ship it back. Have no time to figure it out.
Sell it to me !
Hahaha, shipping to Canada would prohibitive I think.
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Re: Glitchy Gunbird 2

Post by Hrvat9 »

zumbito wrote:
Hrvat9 wrote:
zumbito wrote:Yeas, same here. Mine doesnt display the enemies sprites. I bought it as a replacement, so I think I will just ship it back. Have no time to figure it out.
Sell it to me !
Hahaha, shipping to Canada would prohibitive I think.

How come? I'm seriously interested!
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Re: Glitchy Gunbird 2

Post by caius »

My advice is to check the soldering of the all the surface mounted devices especially the ASICs
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Re: Glitchy Gunbird 2

Post by Stompp »

caius wrote:My advice is to check the soldering of the all the surface mounted devices especially the ASICs
Will do. Looks like I could get hold of a USB microscope through a friend for going over the PCB :thumbup:
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Re: Glitchy Gunbird 2

Post by caius »

Recently I fixed a Gunbird 2 which played in slow motion.One TTL was bad but the main problem was another TTL with bad contact.
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