Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: yoyojoe on March 06, 2012, 04:24:55 PM

Title: Need help with Space Invaders Part 2
Post by: yoyojoe on March 06, 2012, 04:24:55 PM

I'm currently fixing my space invaders part 2 I already replaced all of the bad fuses and the power supply.
I also blew out most of the dust and cleaned most of the dust off the boards.
Currently It will turn on and several white lines will appear on the screen and then fade away after a minute or so.
I'm currently unsure whether I need to replace my monitor or what I should do.
If any one could lend some assistance that would be great I'm still new to fixing games so anything helps.

I tried to take picture of my problems but they didn't show up that well.
http://www.flickr.com/photos/joesparhawk/?saved=1 (http://www.flickr.com/photos/joesparhawk/?saved=1)

thanks for any help

Title: Re: Need help with Space Invaders Part 2
Post by: Belike on March 06, 2012, 06:12:29 PM

Hi and welcome here, a short introduction would appreciated before you join our party. :D
Afaik, those white bars caused by bad capacitors on the monitor chassis, if you have some soldering skills, you can replace them in no time. ;)

Title: Re: Need help with Space Invaders Part 2
Post by: Laschek on March 07, 2012, 01:04:33 PM

Did you replace the power supply with a similar one? The PS in Space Invaders gives out a reset signal without which the PCB won't boot:

http://www.pinrepair.com/video/seawolf.htm

Title: Re: Need help with Space Invaders Part 2
Post by: yoyojoe on March 07, 2012, 05:42:51 PM

the power supply is original i bought it off ebay and seems to work fine

Title: Re: Need help with Space Invaders Part 2
Post by: yoyojoe on March 20, 2012, 04:02:00 PM

I just noticed some mystery wires that aren't connected to anything and I currently have little idea where they go if anyone has an idea could they post it
I posted picks of it in my flickr
thanks for the help

Title: Re: Need help with Space Invaders Part 2
Post by: yoyojoe on April 12, 2012, 05:48:00 AM

I finally replaced all of the electrolytic capacitors on the monitor board but the same thing happens is their anything else that could be the problem

Title: Re: Need help with Space Invaders Part 2
Post by: Arch on April 13, 2012, 12:02:25 PM

Hi and welcome dude,
The lines you describe sound like flyback lines that might be caused by the screen voltage being set too high. If the lines do not look like pixellated graphics garbage that is.
It also sounds like the game is not booting, so you might have two problems on your hands.
Does the exact thing happen _without_ the board connected? If so, you need to adress the board issue first, and when that's fixed you need to look into the monitor issue.

Title: Re: Need help with Space Invaders Part 2
Post by: P-man on April 29, 2012, 01:40:22 PM

have you verified all of your voltages first?

http://www.andysarcade.net/personal/tech/SIvolts/index.htm (http://www.andysarcade.net/personal/tech/SIvolts/index.htm)