Board Repair

[P-Man]

Re: [ukvac] Board Repair
hows about directing you to the bin, and instruction on correctly installing
it in there?

buy a worker off ebay for $15 its REALLY not worht fiddling with a board
with no schematics/little documentation/lack of anyone to talk to that will
admit to having fixed one of these

this is a baord i would call 'uneconomical repair'

just my tuppence worth..

Andy

> Anyone able to help me with my previously posted P.O.W. graphics problem?
I
> am out of options as far as checking for dry joins and cleaning /
> resocketing the chips.
>
> This thing is really annoying now
>
> Can anyone point me in the right direction to locate a diagram or other
> information on these snk boards which shows what the different chips do?
>
> I want to locate the chip which houses the graphics for the main
characters.
>
> Cheers
>
> John



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

 

[John Bennett]

Re: [ukvac] Board Repair
Thanks for the advice Andy, but this was supposed to be a working one off
e-bay...

The problem is so small that I am sure it must be something really simple,
and I know the game is perhaps not the greatest in the world but I would
really like to get it fixed (if only so it can sit on the shelf in working
condition!)

It seems a shame to junk the game when it is very close to 100% working.

Cheers

John



DATA Imported from archives: originally posted by John Lewis (John.F.Lewis@btinternet.com)

 

[MrMish]

Re: [ukvac] Board Repair
> Anyone able to help me with my previously posted P.O.W. graphics problem? I
> am out of options as far as checking for dry joins and cleaning /
> resocketing the chips.
>
> This thing is really annoying now
>
> Can anyone point me in the right direction to locate a diagram or other
> information on these snk boards which shows what the different chips do?
>
> I want to locate the chip which houses the graphics for the main characters.
Nothing wrong with POW Andy... So as long as you don't have to play it for
more than 5 minutes...

Don't have my pcb handy but from what I remember... POW is made up entirely of
sprites (no tilemaps), so all the backgrounds you see are really just sprite
columns. 1 graphics chip puts all the sprites on screen, so if most sprites
work (the backgrounds) and it's just the player graphics that are wrong the the
problem must be localised to a particular graphics rom, or any latches or bus
tracks assosicated with it.

The sprite roms are the ones on the subboard as you guessed - however they are
stored 1 bitplane per rom, so 4 roms are combined to make up any 1 sprite. The
player sprites are therefore in mask roms:

snk880.11a
snk880.15a
snk880.19a
snk880.23a (check with the mame graphics viewer)

If you run the game with any of these taken out you will see the colours of the
player are wrong - try taking them out and see if the lines are present with
only certain roms plugged in.

Let me know how it goes.

Bryan

--
Bryan McPhail: mish@tendril.co.uk
http://www.tendril.co.uk



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

 

[John Bennett]

Re: [ukvac] Board Repair
> buy a worker off ebay for $15 its REALLY not worht fiddling with a
board
> with no schematics/little documentation/lack of anyone to talk to that
will
> admit to having fixed one of these

Yeah... buy a worker off Ebay! Mine ain't had a bid on it yet so it's only a
tenner
http://cgi.ebay.co.uk/aw-cgi/eBayISAPI.dll?ViewItem&item=1018610670



DATA Imported from archives: originally posted by John Cassells (john.cassells@iomartdsl.com)

 

[system11]

Re: [ukvac] Board Repair
On Wed, 17 Oct 2001 00:14:54 +0100
"John Cassells" <john.cassells@iomartdsl.com> wrote:

> > buy a worker off ebay for $15 its REALLY not worht fiddling with a
> board
> > with no schematics/little documentation/lack of anyone to talk to that
> will
> > admit to having fixed one of these
>
> Yeah... buy a worker off Ebay! Mine ain't had a bid on it yet so it's only a
> tenner
> http://cgi.ebay.co.uk/aw-cgi/eBayISAPI.dll?ViewItem&item=1018610670

Yes, things seem incredibly slow on ebay at the moment :/ Lots of utter crap
for sale, some average to good games, but even those don't seem to be getting
(m)any bids.

Maybe it's the recession which Labour like to pretend doesn't exist ;-)

--

find great crazy-mad out-of-head experience from japan.

 

[Macro]

RE: [ukvac] Board Repair
Two ways I have used to isolate a bad graphics rom

1) If you can compile mame, comment out each of the graphics rom lines one
by one, until the same characters are corrupted. Then you are likely to have
found at least one of the roms that hold that character information. (most
sprites etc, will be stored in more than one rom for the colour planes)

2) If you haven't - then simply remove the roms one at a time, power up the
board, see what is affected. again, when you get the same characters
affected, but hopefully worse, then you check that rom image / pins for
shorts, bad connections etc. (although if you have access to a programmer,
then it's normally just as easy to read all the roms and check them with
romident or the mame roms anyway!)

*****************************************************************************
This document originates from within the Bounty Group of Companies.
Whilst we have taken steps to control the spread of viruses on our
systems, we cannot guarantee that this file is virus free.

This message, together with any associated files, is intended only for
the use of the individual or entity to which it is addressed and may
contain information that is confidential, subject to copyright or
constitutes a trade secret. If you are not the intended recipient of
this communication you are hereby notified that any dissemination,
copying or distribution of this message, or of any files associated
with this message, is strictly prohibited. If you have received this
message in error, please notify us at once.

*****************************************************************************
Please visit us on the web - at www.bounty.com or www.diss.net
*****************************************************************************



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

 

[LukeWells]

Re: [ukvac] Re: Board Repair
The heated solder suckers are the best, like a soldering iron and sucker in
one, except you can't solder with it.

Luke

>
> I recommend you buy a cheap de-soldering iron: mine cost about £25 from
RS.
> It's the type with a jumbo sized rubber bulb to generate vacuum and can
have
> a variety of hollow 'bits' fitted. I've had near 100% success removing
> components with this device- except a few piss poorly made Atari boards
> where I lifted the odd track
>
> I've also tried the heat gun method but more often than not I remove the
> ic's intact while frying the rest of the pcb -don't worry they were old
386
> boards....
>
>
> Karl.
>
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>