vision problem please help!!

[PWRSTROKE]

John,  Also as a note,  The processor to back-plane interface takes place via male/female pins/receptacles.  The more sliding in/out etc. the more wear-esp. on the back plane portion.  A lot of times a failure is identified to a board or componet but no explantion why.  This is because it is not cost effective even for igt etc. to compenet level repair such parts depending on the part.  Easier and cheaper to replace and keep on chugging.  A back plane (mother board) to igt is a piss in the bucket -so no bench repair there.  A lot of times it is just as I said a "usage" movement/connection thing but they fail the componet. I had to repair/troubleshoot some simiular problems in the past and some were due to the "pockets" -receptacles in the back-plane contacts being elongated due to heavy in/out/usage/abuse/etc.   As a note these days from what I have seen a lot of the items on newer stuff are exchange now from what I Heard.  Here is my .1/2 cent,  Back-planes in s-2000's/vision fail as anything else over time but it is not a common failure.  It is worth a shot in your case as they are not that expensive.  It will cost you more time than anything to change it and find out-- .  B.

[stayouttadabunker]

  I agree 100%... It seems to me that the receptor female pins start to oxidize
 and "loosen" up over time giving intermittent pin connection.

There are two solutions that can only help...one is to spray the pins (Both male and females)
with some type of de-oxidizer spray stuff in a can that can be found at places like radio shack.
The stuff in the spray has chemicals that help take off the oxidization from the pins.
I think the shelf name is "electronic contact cleaner".
Just don't turn the can upside down or sideways as too much fluid will come out and
take forever to dry out.
Always hold the can's nozzle upright and turn the board and connectors with your other hand.

Two: the hard way but makes the board like new...replace all the pins...
do both the headers and the connectors...I didn't say it was easy! LOL

[PWRSTROKE]

The receptor sockets on these have come a long way since the pins on say a 80's pac man or 70's electro pin.  These are much tougher.  I do not see a high oxidation problem with these here.  That could be different in other climates or,  If your board came from the titanic (I use that term with respect).  The sockets get "wallerd out" from repeat in/out and improper installation/"english" used on the install.  B.

[a69mopar]

Any updates on this?

Thanks,
Wayne

[jrsyjohn]

well wcw1223 you guessed right!! it was the mpu board. last week i changed it and i was up and running in no time.again thanks to all on NLG. you guy's are the best!!

[wcw1223]

I sorry to hear it was the the board OUCH    but I glade you got it running. 

[jrsyjohn]

please don't be sorry, im glad you told me this.you saved me alot of time.thanks again!