:confused: :confused: :confused: I removed the cover on the motherboard and didn't find any connector in the bottom left corner. And looking over the motherboard didn't find any connector with the designation of 'line' and/or 'def'. Everything seems to be designated with 'Jxx' numbers. There is a heavy duty connector in the bottom center of the board with designations of 'J8', 'J9', and 'J11' (left to right). However, the colors on the plug wires don't correspond with the colors of the wires on the defrost heater. I'm at a loss. If it helps the motherboard has designations of 'WKKT 1304-00-00' and '200D6221G009' - don't know if those are part numbers or not.

Multi-connector plugs across the top are labeled 'J1' thru 'J4'. There's another multi-connector plug at the bottom (next to the heavy duty plug) without designation (has pretty heavy wiring).

Please help if you can......................

:confused: :confused: Joe, I Hate to appear denser than I am, but I still have a question. I think my problem has been that you have been talking about the motherboard looking at it from a horizontal aspect as pictured in the parts picture (J8, J9, & J11 on the left side). In the refrigerator it is mounted in a vertical position with the Jxx located on the bottom. So much as to why I was confused.

My question is which pin represents 'line', my guess is it's 'J11', but I want to be sure. I think the jumper should be between 'J11' and 'J9'. Correct?????? Thankyou in advance. :)

Joe, The measurement across J9 and pin 9 of J4 didn't read 120v (assuming that the pins are numbered from left to right looking at the top side of the motherboard). Instead - 1.4 mV with J4 plugged into the
motherboard
- 1.4 mv with J4 unplugged measuring
pin 9 of the plug
- 1.1 V with J4 unplugged measuring
pin 9 on the motherboard

In addition, I jumpered J9 and J11 with it disconnected from the motherboard and the defrost heater glowed bright read within a minute.

Bad motherboard???

:) :) :) Joe, Thanks for your help. It's been a pleasure working with you. Thanks again. I'm going to order the part now.

Evaporator coil still frosting without a defrost. After ordering new mother board I manually defrosted the evaporator coil intending to use the refrig until the mother board showed up. As it worked out the refrig started running defrost cycles for at least three cycles that I know of. But, after about 4 weeks it ceased defrosting. I then went with the new mother board. In doing that I jumpered the plug between (DEFR & LINE) to insure that the defrost heater and defrost hi limit thermostat were still OK. When the jumper was in place on the plug and the refrig plugged in, the defrost heater glowed red and seems OK.

So, I replaced the mother board. After doing so it went thru several defrost cycles and seemed OK. But, again after about 2 or 3 weeks the evaporator coil frosted completely again. Again manually defrosted and watched it go thru two defrost cycles (by watching the water catch tray). Once again, it ceased defrosting. I thought that the earth ground wire looked a little inadequate so I wired a supplement wire to the chassis to insure the earth ground on the mother board is good. But, once again it went thru a couple of defrost cycles and then quit defrosting.

I'm at a loss - do you have any suggestions? I don't know what triggers the defrost cycle but it seems that whatever the trigger, it doesn't seem to think it needs to defrost (too bad it's not a timer like in the old days). Thank god I have a 20 year old refrig in the garage to fall back on when the 4 year old one craps out.