TechTools Archives: RE: ms pac voltage trouble

From: Martin White <martin_at_guddler.co.uk>
Date: Fri Mar 18 2005 - 08:49:42 EST

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<DIV>More times than not i
find piggybacking each of the 2114's in turn with a known good one will reveal
which one(s) it is. Then you only need to cut out and replace the one you've
confirmed to be bad.</DIV>
<DIV> </DIV>
<DIV>Did this the other
night on a frogger board. Someone brought one round with severe graphics
problems and it turned into a 10 minute "while you wait frogger repair service"
:)</DIV>
<DIV> </DIV>
<DIV>That's 10 minutes from
plugging in, diagnosing, bad IC removal, socket installation and
replacement. Nice when things go as easily as that!</DIV>
<DIV> </DIV>
<DIV>Martin.</DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
 <DIV></DIV>
 <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>-----Original Message----- From:
 techtoolslist-bounces@flippers.com [mailto:techtoolslist-bounces@flippers.com]
 On Behalf Of tony Sent: 18 March 2005 11:54 To:
 Technical Tools Mail List Subject: Re: [Techtoolslist] ms pac
 voltage trouble </DIV>
 is there a way to test the 2114 ram on the
 board or do i have to pull all of them and test in 
 my mod-a tester 
 thanks Tony On Thu, 17 Mar 2005
 21:10:23 -0800, John Robertson wrote: > If the board produces a good
 image when you increase the 5VDC > supply then your video RAM has
 at least one bad IC. RAM is usually > the most susceptible to voltage
 fluctuations and will show errors > faster than other
 parts. > > Also the fact that the game
 runs indicates it is not on the Data > bus, rather it is the video
 handling circuits... > > John :-#)# > > At 9:53 PM -0500 3/17/05, tony
 wrote: >> i am working a  a ms
 pac man with a daughter board all ac voltages >> >>> are fine sound works
 great its 5 volt line is at 4.95 vdc at c2 >>> and >>> >>> c3 and the game plays
 but the graphics are real bad and lines >>> >>> through the picture,
 the d7 un banded to d8 ubd 13.5 vac   and >>> d3 >>> >>> to d4 ubd 25.5 vac i
 pulled it from the game and hooked it up on >>> >>> the bench to a good
 monitor and my dc power supply  though pin >>> 18 >>> >>> and ground and gave
 it 4.95 volts same thing then i turned it >>> up to >>> >>> 5.75 vdc and bam it
 all came in fine looks great so how do i get >>> >>> the ac in the game up
 or the dc on the board up checked for ac >>> in >>> >>> the dc and there is
 none and checked d9 for a short or leaky >>> and it >>> >>> was not any
 help >>> >> thanks ton >> >> >> _______________________________________________ >> Techtoolslist mailing
 list >> Techtoolslist@flippers.com >> <A
 href="http://seven.pairlist.net/mailman/listinfo/techtoolslist">http://seven.pairlist.net/mailman/listinfo/techtoolslist</A> </BLOCKQUOTE></BODY></HTML>

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