My user interface (as you call it) was having a very difficult time working right. I would push the buttons on top and it just wouldn't start the dishwasher and some of the lights wouldn't light up. I replaced the part and the dishwasher worked for a month perfectly. Then out of the blue, none of the buttons would work at all or even light up. I got another user interface and it won't work any buttons either. I am thinking that isn't the problem ? I did a test with a power finder and it chimes as I get close to the start buttons, which makes me think power is getting up to the board.
Answer Hi RHY. Use a volt/ohm meter part #@ TJMA-DM1 to assist you in your diagnostics. It will be advantageous to find the supplied tech sheet inside the cabinet to aid you in the diagnosis. It allows you to put the unit in a diagnostic mode which brings up fault codes and tells you which circuit needs assistance. It is located in the control panel area or the lower kick plate. Use the door striker to trip the door latch to make sure you are getting full 120 volts to the control board through the thermal fuse part # 8193762. A very common board lost voltage power issue that now is upgraded. If not back up and check the door switches to insure you are not loosing voltage there. If you still do not have full voltage then back up to the lower power junction box and make sure the connections are tight at full supply voltage there. Use the breaker for safety. As you have a solid copper supply line and the dishwasher has a solder tinned stranded wire, it is common the stranded wire will lower under the wire cap twisting effect to the bottom of the solid wire and not allow the proper total stranded wire length to tighten with the solid wire together. Knowing this is an importance that the unit can get apparent voltage but will not draw the correct amperage needed under a load and starve a control board and prematurely ruin it. It all can go back to a improper installation issue. Make sure the 14 pin control board is connected fully and that all female spade connections will contact the solid board pin tightly. Use a pick tool and a magnifying glass to close the wire connector female spade connectors. Let us know how to help further if so needed. Thank You.