Yie-Ar Kung Fu pcb

[ben76]

Hi all,

I was after a Konami-1 chip and without doing proper research I thought Yie-Ar Kung Fu had one...
Anyway I do quite like the game so chuck a sneaky bid on one on ebay...

Yes it was 'untested' which as we all all know means broke....

However I had spoke to the seller and I do believe it was completely
untested as he is into fruitys and was a pleasant chap. So took the
plunge and bid on it....

It arrived without a Konami-1 and yes it was indeed faulty....

So
I have been slowly looking into it and I do believe a good few pointers
for people are here, not sounding big headed! but I did what I think as
the basic checks and it now works

Tools used...

Soldering Iron.
Desolder gun.
Eprom programmer.

Checked
the pcb over and found an LS245 the wrong way round as seen circled in
the snip from the ebay auction as I forgot to take a pic

So obviously the chip needed to be turned round.. It was however in bad shape

and left a few pins behind in the socket. So out with the socket, in with a new one and a new 245.

Here's the old chip...



I did the initial pcb power up and was greeted with...



Now
as far as I know seeing this means it has tried to boot so cpu, clock,
etc have dropped down the check list... That leaves roms and ram as the
easy checks... So I went round and checked all the roms and Rom 07
failed the checks, it was a 27128, I had a spare 27128A so used that
instead, I even used a bit of IPA and stole the label off the old chip!

Pic showing new LS245 (at 5F) in place and the rom 07 (at 8D on the pcb) with original label reused

Plugged in and we have....



All fully working

Sometimes the easy checks pay off

Now it will probably go for sale as I have no room for it

- Ben

 

[vib_ribbon]

man......... you're so much better than me at this!

 

[ben76]

man......... you're so much better than me at this!

cheers mate

didn't really do more than the basic checks tbh

just wanted to show that basic stuff can fix pcbs so if people don't know where to start that visual and rom checks (as well as voltage, etc) can solve stuff and get it going again.

- Ben

 

[Bods]

Thats cool matey

I have one of these somewhere, think I got it from the tip with a pile of other parts and boards

So what do I need to check the roms on boards? as I need to get my Crossbow boards working, now got one doing the common seen error with jail bars

 

[IndyJones]

Great game to fix, they used to have it at my local swimming baths, I hated swimming at school so just used to play on the couple of arcade cabs in the entrance, one was deffo Yie Ar, I remember buying the Amstrad cpc port of it.

 

[ben76]

Thats cool matey

I have one of these somewhere, think I got it from the tip with a pile of other parts and boards

?

So what do I need to check the roms on boards? as I need to get my Crossbow boards working, now got one doing the common seen error with jail bars

you need an eprom programmer to check them. The code on the chips will tell you the chip type so you read it as that then check it against mame. I have a gq-4x and it has done every chip I have needed to do. I won't do larger chips (42 pin, etc) unless you have an adapter (which I do) for the programmer and adapter was about 100 quid iirc. People do have diff programmers so best to find the one that does the most used chips by your stuff. I can't do GAL chips but haven't had to yet. If you are going to write to chips you will also need a uv eraser, again being a tight arse I just have a cheapo chinese one off ebay.

- Ben

 

[RGP]

Well done Ben!

Sometimes the most complicated thing on the outside is the easiest to fix when you get going.

Checking for IC's the wrong way round is something that I think probably gets overlooked a lot.

Kudos!

 

[Bods]

Used to do a bit of eprom stuff at work years back

I'll have to get one of those, really need to fix some pcb's and it's great to see that it can be something as simple as a bad rom that stops the game like that

ones on ebay for 80 quid, only has to fix a few boards and you get your money back

 

[Bods]

I will always remeber when we used to test all the old rental Sky boxes that came back, they were preset for in the channel order, as it was the original amstrad ones only 18 channels

Granada wanted them in a different order to factory, so I had to retune them and setup

Got one box that I setup up the way they wanted, switched it off to clean it and when I put it back on, all the stations were back to factory. It wouldn't store the stations, got the circuit out to see which the Memory chip was and found it was in the wrong way, that was from the factory as well, turned it round and it worked ok after

 

[ben76]

Used to do a bit of eprom stuff at work years back

?

I'll have to get one of those, really need to fix some pcb's and it's great to see that it can be something as simple as a bad rom that stops the game like that

?

ones on ebay for 80 quid, only has to fix a few boards and you get your money back

mine has already paid for itself and also helped a few others out too

- Ben