An SMPS controller burned on my LG Washer control. LG didn't have any boards in stock, so I decided to repair it myself. Pried the board out of the tray with

An SMPS controller burned on my LG Washer control. LG didn't have any boards in stock, so I decided to repair it myself. Pried the board out of the tray with autobody pry tools and pulled away the silicone goo where I needed to repair. I don't know what the rationale is for the board being covered in a half inch of rubber potting. A smaller coating would have provided a water seal, and this rubber is a heat insulator. Seems counterintuitive to me. You will have to replace the board if the transformer has an open winding, because all these transformers are application specific. The silicone was burnt around some of the transformer terminals on my board, which scared me, but I didn't find any open windings. The other special part on this board is the cpu, everything else on the board is commodity and it is a real shame that LG decide to use this rubber potting AND screw up the supply of replacement parts. I think it's a real flaw to integrate switchmode power supplies into control boards.