Over a few days my washing machine spun slower & slower, until the drum would not rotate. After disassembling the stepper motor everything appeared to be in good condition. Eventually I measured the incoming voltage lines using a multimeter. Running the machine's test sequence for the motor showed no voltage using either AC or DC test options. The wiring all appeared to be fine & ohmed out correctly back to the main circuit board. Further testing showed that no measure able voltage was being produced by the inverter on the main circuit board. The board was in cased by rigid plastic & what appears to be clear silicone. I cut away the plastic housing, which revealed that the board was discolored inside the silicone. I don’t see the white ash which comes from silicone decomposing from heat, so the discoloration is probably from something else on the board, flux possibly? At this point I stripped off the silicone from the backside of the board to electrically reach the components. The silicone was sticky & softer in the discolored areas.
Honestly, I’m not sure what I should be doing to test the board or figure out what is wrong. None of the capacitors seem obviously exploded. Any ideas?