Will the $150 be a permanent fix? You'll be the first to know. Should you try it? Kinda depends on how well you can get along without. If you can get by, I'd sure give it a go IF you can get the new motherboard.

Another strategy would be to go ahead and get a new fridge and fix/keep the old one. True story: Dad built a kitchen/living room onto our house and the new kitchen had framed niches for the fridge and the freezer. Came the day to move the fridge and... it wouldn't fit! Mom & Dad went to town and picked up a new fridge that had a dent in the side. Kept the old fridge in the old kitchen. Mom remarked many times how handy it was having that second fridge.