Build Your Own Arcade Controls Forum

Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: Bobby on April 01, 2010, 04:09:48 am

Title: Galaga Lines
Post by: Bobby on April 01, 2010, 04:09:48 am

I have a Galaga game and its sick atm =[ any ideas on how to fix it here are some photos of it

(http://img186.imageshack.us/img186/6751/77212543.jpg)
(http://img89.imageshack.us/img89/5523/67854562.jpg)


-Bobby M.

Title: Re: Galaga Lines
Post by: Spyridon on April 01, 2010, 09:34:02 am

First thing I would check is your power supply.  You can see how to test it here (http://www.arcadeshop.com/galaga/galaga.htm).

Title: Re: Galaga Lines
Post by: Bobby on April 01, 2010, 05:40:35 pm

I think it maybe the power supply it read 2.1volts I try to turn it up but it didn't go up that much just .2 or so

Title: Re: Galaga Lines
Post by: Spyridon on April 02, 2010, 09:17:28 am

Sounds like you need to rebuild your power supply

Title: Re: Galaga Lines
Post by: SirPeale on April 02, 2010, 01:22:57 pm

Though possible, @ 2.1V you shouldn't be getting much of anything at all.  Where did you measure from?

Title: Re: Galaga Lines
Post by: RayB on April 02, 2010, 02:21:55 pm

Yeah that doesn't sound right. THe game would not even boot up with such low voltage.

Title: Re: Galaga Lines
Post by: Pinball Wizard on April 02, 2010, 06:50:35 pm

Looking at this: http://www.arcadeshop.com/galaga/galaga.htm (http://www.arcadeshop.com/galaga/galaga.htm)  If you scroll down some you'll find some things about RAM. That looks similar to your problem.

Title: Re: Galaga Lines
Post by: CheffoJeffo on April 03, 2010, 09:57:20 am

Quote from: SirPeale on April 02, 2010, 01:22:57 pm

Though possible, @ 2.1V you shouldn't be getting much of anything at all.  Where did you measure from?

+1

Galaga is notorious for being thirsty and there is no way she would boot at 2.1V

Title: Re: Galaga Lines
Post by: Bobby on April 17, 2010, 01:35:31 pm

I just check it with a 2nd meter and it shows to be 5volts for the first 5mins of boot up its fine after 5mins the lines start to show up

Title: Re: Galaga Lines
Post by: Kevin Mullins on April 17, 2010, 04:03:30 pm

Could be heat related... I'd clean and re-seat any socketed chips. (ROM's, etc)
At the very least press them all in good.

Title: Re: Galaga Lines
Post by: SirPeale on April 17, 2010, 04:08:39 pm

Definitely thermal related issue.  Chip "creep" would explain a lot of that.  I'd definitely reseat any socketed chips.

Title: Re: Galaga Lines
Post by: Bobby on April 17, 2010, 04:57:50 pm

That was one of the first things i did when it went down took the rooms out and clean them and put them back in. is there any sites that may have them for sale?

Title: Re: Galaga Lines
Post by: SirPeale on April 17, 2010, 07:12:07 pm

If it comes up good at first, but gets bad as it's on, it's not a ROM problem.

Are there other socketed chips?  Reseat them too.

Could also be a cracked solder joint.  Starts off okay, but as it heats up it looses connection, causing the problems.

Title: Re: Galaga Lines
Post by: Bobby on April 18, 2010, 02:30:23 am

Do you think it might have anything to do with the chassis board or is it on the game board the board looks fine.

Title: Re: Galaga Lines
Post by: SirPeale on April 18, 2010, 07:13:45 am

That's definitely a board issue.

Just to be straight: the game STARTS okay, but after a few minutes turns into the photo with lines as seen above.  Is that correct?

Title: Re: Galaga Lines
Post by: Bobby on April 18, 2010, 05:55:30 pm

Yes Thats what it does. good for a few mins than turns into that.

Title: Re: Galaga Lines
Post by: Zebidee on May 02, 2010, 08:14:05 am

Did you check the power supply voltages AFTER the lines start showing up?

Title: Re: Galaga Lines
Post by: CheffoJeffo on May 02, 2010, 11:09:38 am

Do any of the chips get really hot after those few minutes ?

Title: Re: Galaga Lines
Post by: channelmaniac on June 22, 2010, 12:37:34 pm

Go to Fry's, Radio Shack, Maplins, etc... and pick up some component cooler spray.

If you can't find that then get a can of "air duster" spray and use it upside down so the liquid sprays out.

Cool off each of the 2147 RAM chips one at a time to see if the screen clears up when you freeze a particular chip. Replace that chip.

If it's not the 2147 RAM chips, there's a couple of chips that take the data from the motion RAM and adds in the other items such as scores/text. Check those. If that's not it then check the 74LS368 IC that buffers the clock on the video board. I've seen a bad one of those cause this issue too.

RJ