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Leaky batteries - Pretty colour

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Steevsee:
Couple of quick pics of some WPC89 cpu boards with battery vomit.

First is from a TZ that lost direct switch inputs.  
Surprised that's all that didn't work!

Notice the pretty blue deposits on the chips to the left of the battery.

I have replaced the board with a new original one at the owner's request but will be cleaning and rebuilding this one shortly.

The owner also had a DW with the same trouble,(no direct switch inputs) which also had battery related damage around the switch inputs.  This was a result of a poor prior attempt to neutralise corrosion and despite a remote battery holder being fitted, the corrosion returned.(last pic)

This board was also replaced with a new original as requested by owner.

Steevsee:
Some more pics.
First is the area around U16 after initial cleaning.

Second pic shows a closeup of the ic pins that were beneath the blue deposits.

Lastly is a random pic from the second board which had supposedly been cleaned of corrosion. Yuck!

beaky:
every trace of corrosion must be neutralized and removed.
even the via's must be cleaned out. no use removing the top and bottom corrosion unless you remove the via corrosion. and the corrosion under the headers.
and if it has made its way as far as the housings for the switch rows / columns then these will have to be replaced also
on 2 occasions i have had to cut and replace several inches of row / column  wire because when you stripped the insulation back the conductor was green / white with corrosion

Pop Bumper Pete:

--- Quote from: beaky on April 05, 2015, 03:56:40 AM ---on 2 occasions i have had to cut and replace several inches of row / column  wire because when you stripped the insulation back the conductor was green / white with corrosion

--- End quote ---

So, you can always get back to clean wire?

Steevsee:

--- Quote from: beaky on April 05, 2015, 03:56:40 AM ---every trace of corrosion must be neutralized and removed.
even the via's must be cleaned out. no use removing the top and bottom corrosion unless you remove the via corrosion. and the corrosion under the headers.
and if it has made its way as far as the housings for the switch rows / columns then these will have to be replaced also
on 2 occasions i have had to cut and replace several inches of row / column  wire because when you stripped the insulation back the conductor was green / white with corrosion


--- End quote ---

Thanks Andrew.
Already did the corrosion removal/neutralisation.
Followed this guide.  http://aussiepinball.com/index.php?topic=9108.0
Thanks.

Interesting how it travels along the wires.

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