Magic Sword - CPS1 Repair

TheDaddy

TheDaddy

Senior Member
vacBacker
Feedback
14 (93%)
Credits
7,020CR
Ok so its been ages since I put any repairs on here. Sadly lack of time and the fact that not that many people seem to read them !!!

SORRY ABOUT PITCURE QUALITY - NOT SURE WHAT IS GOING ON WITH CAMERA !

Any way today I had some time so I grabbed a CPS1 Magic Sword I purchased faulty.
First Problem :- Intermittent Boot
Second Problem :- No Audio

Third Problem :- Bad Video (Lines through video)

Board before I did anything - Just labelled things ready for repair

magic2.JPG


Stripped and started cleaning :-

magic3.JPG


So first off the board was very dirty so I always strip them down and clean everything, So i started by removing all of the socketed IC's. I did notice that some of the legs (Mainly to the audio CPU) was corroded. So I gave the board a good clean and cleaned all the legs on the IC's cleaning them after with IPA. I also checked and verified the 3 Audio roms why i had them out and they all verified correct. I then re seated all the chips and fired it up ...

magic4.JPG


We now had Audio (Yeh !) and the board booted every time but we still had major graphics issues.
Next was to work out why the video was off , I suspected a rom but which one ?? There is 4 main GFX roms all labelled HN62404 - These are mask roms and can be read but need to read with a converter.

A good way to test is to remove each IC an see what difference it make, It will normally make some difference but how much is the question. I had labelled the Mask Roms 1 , 2 , 3 , 4

Remove 1 - Made loads of difference (Video gets worse)
Remove 2 - Made loads of difference (Video gets worse)
Remove 3 - Not much difference at all

Remove 4 - Made loads of difference (Video gets worse)

So looking at the above I suspect Number 3 , So i removed and read the Mask Rom and Yep it was incorrect and would not verify. So burnt a new one a popped it in , Fired it up and voila ! All good playing well with sound and video all good.

Sadly I did not get time to play on it for long , You forget what a good game it is !!!!

magic5.JPG


Thanks For Reading,

Dave.

P.S If you enjoy reading this then please feel free to comment or give me a thank you, I have not been posting many of my repairs as it doesn't look like many people read them or bother to comment. It takes a while to do these as well !

A few images of this in the repair software :-

magic6.JPG


magic7.JPG


magic8.JPG


msgic8.JPG


TheDaddy2020-04-16 22:00:06
 
TheDaddy

TheDaddy

Senior Member
vacBacker
Feedback
14 (93%)
Credits
7,020CR
Del Griffith said:
Nice fix
smiley20.gif


How goes the A board test rig you were building? Any repair logs on those imminent?
Click to expand...

Yeh I sort of started it but never finished. I got all the cables ready - I never got around to making the jog , I am hoping to get too it at some point as I have a few to repair
smiley4.gif


Dave.
 
lix

lix

Active member
vacBacker
Feedback
1 (100%)
Credits
545CR
I don't post every repair that I do and I wish that I did really, sometimes the typing up and preparation of a repair log can take longer than the actual repair! I've done some pretty good and lengthy repairs while not logging stuff as I go along and a few months later completely forgot what I've done, and needed to do the same again! So I now know I have to do it because of my tiny brain.

It is an invaluable resource for other people further down the line as well. I've done google searches for repair logs and found similar faults on my boards for which the advice has vastly helped. So you may not get thanks immediately, but they'll come in the long term and save boards from scrap or going in the ground.

I remember my first ever CPS1 board repairs back in the mid 90's, mainly Strider and Ghouls and Ghosts boards. Broken filters and caps, bad Z80s and ram chips, long before silicon depletion killed all the custom chips.
 
vib_ribbon

vib_ribbon

Active member
Feedback
5 (100%)
Credits
487CR
thanks for posting. repair logs are some of the most interesting posts for me even though i dont have the time to look at any of my broken pcbs these days.
 
qjuk

qjuk

Active member
vacBacker
Feedback
50 (98%)
Credits
1,821CR
Nice straight forward repair Dave and thanks for the write up. Good to see another board saved
smiley20.gif


lix said:
It is an invaluable resource for other people further down the line as well. I've done google searches for repair logs and found similar faults on my boards for which the advice has vastly helped. So you may not get thanks immediately, but they'll come in the long term and save boards from scrap or going in the ground.
Click to expand...

I think this pretty much sums it up.

There’s been many repairs logs from years ago that has really helped me and I genuinely appreciate the time and effort these people go to document their fixes. You might not get a thank you now but trust me you’ll get someone who is really grateful in the future when you help them save a board.
 
M

mysticmonk

Active member
Feedback
10 (100%)
Credits
1,009CR
qjuk said:
Nice straight forward repair Dave and thanks for the write up. Good to see another board saved
smiley20.gif


lix said:
It is an invaluable resource for other people further down the line as well. I've done google searches for repair logs and found similar faults on my boards for which the advice has vastly helped. So you may not get thanks immediately, but they'll come in the long term and save boards from scrap or going in the ground.
Click to expand...

I think this pretty much sums it up.

There’s been many repairs logs from years ago that has really helped me and I genuinely appreciate the time and effort these people go to document their fixes. You might not get a thank you now but trust me you’ll get someone who is really grateful in the future when you help them save a board.
Click to expand...

Yeah absolutely, I've come across previous repair logs that have been seriously helpful in narrowing down problems. Even being able to fix them sometimes.

Most of the time though, this is me reading complicated repair things...

tenor.gif
 
TheDaddy

TheDaddy

Senior Member
vacBacker
Feedback
14 (93%)
Credits
7,020CR
Monstermug said:
Is your repair software available to download?
Click to expand...

Not just yet - I am seeing how many people want it and if its worth me developing for release. Did a thread here to register interest but I will add you too the list :)

http://www.ukvac.com/forum/arcade-software-interested_topic376361.html

Lix Wrote :- I don't post every repair that I do and I wish that I did really, sometimes the typing up and preparation of a repair log can take longer than the actual repair! I've done some pretty good and lengthy repairs while not logging stuff as I go along and a few months later completely forgot what I've done, and needed to do the same again! So I now know I have to do it because of my tiny brain.

This is one of the reasons for the software , My brain is like a sieve ! once I repair something I forget and looking back and my repairs is a god sent !

Dave.
 
You must log in or register to reply here.
Top