Corrosion: Difference between revisions

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[[File:Patchfix.jpg|256px]]
[[File:Corrosion.jpg|thumb|Extreme case of PCB corrosion caused by a leaking backup battery. Picture stolen from supergoose.]]


Battery replacements ? Charging resistor ?
Corrosion is one of the main causes of faults on arcade boards. Home consoles are usually handled with more care and they have a plastic shell, making them less vulnerable.


=Patching traces=
Corrosion on PCBs causes copper and other metals to be "eaten up", cutting traces and connections between the components. Copper shouldn't "rot" naturally, especially since it's covered by the green soldermask. Corrosion can be a slow process, and is often caused by leaking batteries and spills.


Make sure to use the appropriate gauge when patching power traces, AWG 35 won't allow 1 amp for long...
=Solutions=


* "Kynar" wire: Great. Get a good quality spool (high-temperature plastic).
PCBs damaged by leaking batteries can often be repaired by cleaning them and [[trace patching|patching the broken connections]].
* Magnet wire: Good, easy to salvage but can be hard to solder.
* Telephone wire: Can do the job for a few traces, but very rigid (and ugly).
* Paper clip: '''No'''.


* Tape: If temporary, why not. Might leave sticky residue.
In some cases, corrosion caused by spills can cut entire buses and even "climb up" chip pins, taking out 10's of traces and some chips.
* Hot glue: Good, just don't make a mess and '''don't apply it to chip pins'''.
 
* Nail varnish: Good, can take a while to dry. Easily removed with acetone.
[[Battery replacement]]
* Random glue: No, probably won't stick or will stick too much. Can also [[corrosion|eat the board up]].
* Epoxy glue: '''NO. NEVER.'''


[[Category:Repairs]]
[[Category:Repairs]]

Latest revision as of 22:02, 8 December 2016

Extreme case of PCB corrosion caused by a leaking backup battery. Picture stolen from supergoose.

Corrosion is one of the main causes of faults on arcade boards. Home consoles are usually handled with more care and they have a plastic shell, making them less vulnerable.

Corrosion on PCBs causes copper and other metals to be "eaten up", cutting traces and connections between the components. Copper shouldn't "rot" naturally, especially since it's covered by the green soldermask. Corrosion can be a slow process, and is often caused by leaking batteries and spills.

Solutions

PCBs damaged by leaking batteries can often be repaired by cleaning them and patching the broken connections.

In some cases, corrosion caused by spills can cut entire buses and even "climb up" chip pins, taking out 10's of traces and some chips.

Battery replacement