so i effed up my galaga

finch10101

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installed the galaga renew kit today..
first i replaced the 05xx 00xx 04xx sockets because they just looked bad
put the chips back in and tried it...no change in my video issues

so i made the mistake of just replacing all of them on the video board and the resistor packs repairing a few nearly cracked off legs along the way, didnt touch the cpu board

now i just get white stuff flying across the entire screen(no h-sync does nothing) and no boom...i had boom and non visable playability before

sigh.

i looked over the solder points 10 times looking for shorts but they all look brilliant
maybe i burned up a chip when repairing a leg huh? dunno
 
Check the sockets and resistor packs you removed VERY carefully for chunks of traces or plated thru holes. It's easy to pull those out of a Galaga board. :(

If you find any then you simply need to patch the trace.

Also check the solder connections for bridges. Those traces run VERY close to the solder pads and tend to bridge with a small whisker of solder. You'll need a magnifying glass to check those.
 
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i had the same problem and it was what channel said, the plated thru holes and the solder bridges. once you get that figured out you have eliminated a lot of problems.
 
ugh well live and learn i tossed most of the old sockets and resistor packs before i could look at them what a noob.

anyway ive been checking for continuity on the socket pins and where they are supposed to run as shown on the schematic but found a problem between 4F and 4D. correct me when im wrong but the schematic seems to show that every pin should have continuity with the coresponding other pin on the other chip...eg pin 1 on 4F goes to pin 1 on 4D ect.. as well as other places

But when i trace pin 7 on 4F it ends up running to pin 14 on the chip at 3N.
And pin 7 on 4D goes runs to pin 9 on 2E

any idea why im seeing this?
 
anyway ive been checking for continuity on the socket pins and where they are supposed to run as shown on the schematic but found a problem between 4F and 4D. correct me when im wrong but the schematic seems to show that every pin should have continuity with the coresponding other pin on the other chip...eg pin 1 on 4F goes to pin 1 on 4D ect.. as well as other places

But when i trace pin 7 on 4F it ends up running to pin 14 on the chip at 3N.
And pin 7 on 4D goes runs to pin 9 on 2E

any idea why im seeing this?

Pin 1 or Pin 24 ? VCC on pin 24

2732.png


I've found one of the best ways to troubleshoot, is BEFORE installing the new socket is to hold the board up to a very bright light source. Easy to determine if any pads or traces were damaged during desoldering/removal.
 
thx 4 the reply
yea i was counting pins wrong and now the schematic makes way more sence, except why a 16 pin chip at 3n just looks like a not gate on there but i had to google that(thought it was a diode) so im clearly no electronics buff

back to tracing
 
Good luck, Galaga is one board I refuse to bother with these days, so much leg work just to rule out physical problems, crap sockets, tarnished customs, fragile resistor networks, shitty ribbon cable sockets. Each board is about 5 hours hard labour before you can even get as far as troubleshooting the chippery.
 
Good luck, Galaga is one board I refuse to bother with these days, so much leg work just to rule out physical problems, crap sockets, tarnished customs, fragile resistor networks, shitty ribbon cable sockets. Each board is about 5 hours hard labour before you can even get as far as troubleshooting the chippery.

The renew kit is a kit I put together. It's all new 24/28/40/42 pin sockets and resistor packs for both boards.

It takes me about 2 hours if everything goes OK. That's why I charge $80 to repair them.

Take your time and inspect the solder joints with a magnifying glass under a strong light to see if you have any shorts to adjacent traces.

RJ
 
deoxIT

My Galaga had corrupted graphics when I bought it, so I followed the guide on here and got it working in no time:

http://www.arcadeshop.com/galaga/galaga.htm

I pulled every chip and cleaned the pins with an eraser, then used deoxIT on the pins and socket. You should give it a try, worked like a charm, and still working great a year later!
 
defeated................i let my galaga sit while i searched for different boards.

then tonight on a whim i powered the thing on and found that it behaved exactly as it did before i did any work on the video board. boom sound and garbled playability and sound.

so maybe i didnt do damage with the renew kit yes? but what is it that had to sit for days before it made contact?

i didnt replace the ribbon cable(nor do i know how to get one) and I have yet to touch the cpu board. i did clean the contacts where the edge connector sits



whats my next move???
 
defeated................i let my galaga sit while i searched for different boards.

then tonight on a whim i powered the thing on and found that it behaved exactly as it did before i did any work on the video board. boom sound and garbled playability and sound.

so maybe i didnt do damage with the renew kit yes? but what is it that had to sit for days before it made contact?

i didnt replace the ribbon cable(nor do i know how to get one) and I have yet to touch the cpu board. i did clean the contacts where the edge connector sits



whats my next move???

My graphics were all garbled when I got my Galaga, but all it took was cleaning all the chips, and it works great now! I pulled each one out of the socket, cleaned the pins with an eraser, and then applied deoxIT to the pins.
 
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