Hello fellow IPV2 users! I have had mine since August and have recently been having issues with the resistance reading anywhere between normal at 1.4 ohms to 6+ ohms. Even set at 10W a 6 ohm load maxes out the IPV2 voltage setting and sends 8+ volts into my Kayfun which is not good. I decided that I have trashed too much
juice due to fried builds so I decided to investigate the issue. What I did was opened up the IPV and did some simple resistance checks on the center pin and the outer ring of the 510. The center pin even though slightly wobbly never varied. The outer band on the other hand seemed to be hit or miss depending on how hard I pressed my leads against the band. I thought that it was a faulty connection between the case which is the main ground and the 510 connector since there isn't a dedicated lead to the outer portion. What I initially tried to do was solder the shell to the box which turned out to be futile as the heat required to melt the solder was getting beyond dangerous and I didn't want to risk melting the board with a torch. I figured that the 510 is threaded or pressed in maybe that isn't the problem. I then thought that there was some crud or corrosion on the threads of the Kayfun and or the 510 outer piece. What I did was gave the 510 a good bath in 91% rubbing alcohol and let it dry. Then I applied some Anti-Oxidant Joint compound that I used on house wiring (mains to the pole to the meter box). I removed the center pin completely and then added just a tiny dab to it and then screwed it all the way back in. Then I took a toothpick and lightly applied some to the Kayfun and screwed it in as far as it would go (flush with the mod). I noticed that when I put one lead of the meter on the case and the other on the KF the resistance NEVER changed while screwing in like it did earlier. I set the center pin to where it needed to be and checked the resistance on the IPV. Low and behold it was dead on!!!! Did some loosening and tightening and wiggling etc... Dead on 1.4 ohms like it should be and never changed!!!!! I then applied a little compound to the rest of my 510 attys as this stuff seems to be magic. I believe that the problem all along is that either 1. the 510 on the IPV has some corrosion/oxidation on it, or 2. the KF had some corrosion/oxidation on it, or 3. a combo of 1 and 2.
Either way this fixed my issues as I was starting to get super frustrated. It may even save a unnecessary warranty claim for others so it is worth sharing.
Here is the stuff that can be purchased at Home Depot for about $3.00:
