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 Originally Posted by Remy X
John, i think he just wants to swap the ribbons between the parts phone and the dd, and is asking as to what tools he'd need besides the usual Torx screwdriver... but.. since we are talking electronics repairs, maybe you might have some advice for me 
I have a (desktop) machine i used to use before i bought my current laptop, and it was damaged by rats a three years ago when it was left unattended for a little over a week, where the rat(s) squeezed in through an open PCI slot. At the time, i didn't notice that there was any urine and forgot to remove the CMOS battery, but when i was moving last March, i realized here was now some oxidation 
How would i go about checking if the traces have corroded all the way through or it's just surface damage? Does the varnish on the board do anything to protect against electrolytic corrosion or is the board probably hopeless?
I'll post some pics later...
Depends on the size of the traces if your have a OHM meter that is small enough one can test the trace before/after the corroded area to see if the signal still rides the trace (you have to measure even a small difference because another chip could get the OHM charge and back feed it into the other side).
My OHM meter has a gauge that measures from 0 to 1 with steps of .001, it is digital with an analog as well, so I can see both, if I see .999 instead of 1, so I check hit each pole to each other should get 1, then place each pole on each side of the corroded trace should reach 1, if less then 1 then it could be back feeding from another component (the only real way to test is to isolate the trace that is not easy depending on the type of layered board).
The electrical paste (varnish as you call it) if any was designed to prevent bleeding of the signal, as metallic dust can get inside and cause shorts, nothing is hopeless, just takes time and a cleaning brush (soft like a tooth brush-depending on the size of traces again) to clean the corroded area, remove as much of the bad stuff, until you have just the trace visible, if it is broke one can use a small thread of copper wire to re-join the trace or use solder to fill the broken gap then re-cover with electrical paste (kind of like varnish) not sure what it's real name is, but it is like a rosin, comes in a bottle looks like nail polish, and goes over the trace sealing the trace.
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