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Discussion Starter #1
Hi Folks

I had a look at the VR module to see if I could figure out why it was not charging. The circuitry is covered with a conformal coating to keep it from corroding. In some places the coating had broken down allowing corrosion to eat away at the circuit board. There was a board trace that was eaten through completely. I cleaned it up and resoldered several bad connections and tested it. It was charging but only as a half wave rectifier and would not shut off as the battery came up to voltage so there is still some problem in the circuit. The circuit is simple and clever and gets the job done with a minimum of parts. I will let you know what I find. It should be possible to repair or rebuild these units.

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