Re: SW Vector PROM problem

Everyone!

I noticed that prom 136021-113 was running quite hot compared to the other
3 chips so I swapped in a second replacement and now the board appears to
be working properly. After a few hours of "burn in testing" last night a
few hours again this morning it looks like all is well.

Any thoughts on the original AVG board and why it would have no video
output ? Is there a common failing part on these?

Thanks !

Steve

  At 09:55 PM 11/29/2003 -0800, you wrote:
>I picked up a "tested and working" Star Wars board set on EBAY in hopes
>that I could bring it with me to look at my friends ESB problems I
>mentioned a few weeks ago... It arrived playing blind (spot killer on) -
>so I swapped in a known working AVG board and the game came up with a
>picture. Now it has no starfield (in attract and game) and no ties
>fighters when played with a tiny death star in the middle of the
>screen. Test mode comes up with following Matrix Errors:
>
>NNNF FNFN 0000
>NNNF FNNF 0000
>NNNF FNNN 71C8
>NNNF NFFF CA48
>NNNF NFFN 2D16
>NNNF NFNF 1FC2
>
>After searching Google for SW matrix error posts I found a thread where
>Greg Woodcock talked about my exact problem and that it is attributed to a
>bad vector PROM on the CPU board - chips 136021-110 thru 113 (not sure
>which one). Since I still had all the old chips from some previous ESB
>upgrades, I swapped all four PROMs (at the same time instead of one at a
>time). The game came up working normally during attract mode and during
>play of the tie fighter wave but when the next wave started all went
>blank. It appears that the PROM blew again. The board now works like it
>did before swapping the PROMs.
>
>Here's the questions:
>
>1. What would cause the PROM to blow / fail ? I'm pretty sure the sockets
>are OK
>
>2. What should I try next to narrow down the failing part?
>
>Any help is appreciated
>
>Regards,
>
>Steven Winslow
>
>
>At 11:07 AM 11/6/2003 -0500, you wrote:
>>I had a Tempest that would do this. The watchdog circuit on the monitor
>>had a problem. I replaced the monitor because I was in a hurry (and I
>>could), but that was what was wrong.
>>
>>-Al-
>>
>>
>> > Hello Everyone!
>> >
>> > What are your thoughts on a Star Wars ESB that works just fine in
>> > attract mode but blanks out when you try to play a game? A friend of
>> > mine has one that has just started doing this and has asked me to come
>> > over and take a look at it. Don't know what it does in test mode yet.
>> > What are the common faults for this symptom ? Thanks for your help
>> > ....
>> >
>> > Regards,
>> >
>> > Steven Winslow
>> >
>> >
>> >
>> >
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>>
>>
>>-=-=-=-=-=-=-=-=-=-=-=-=-
>>Visit Al's Arcade
>>http://www.alsarcade.com
>>-=-=-=-=-=-=-=-=-=-=-=-=-
>>
>>
>>
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Received on Sun Nov 30 12:55:10 2003