It can depend. Usually, a reputable repair shop will tell you an item is Beyond Economical Repair (BER) if the cost of their repair is going to exceed the cost of replacement. Estimating the cost is hard because there are multiple things that could have caused the failure, and each part could have a drastically different price tag. They won’t know what the parts cost will be until they have diagnosed the faulty part. Often, repairing the item should be cheaper than buying a new one; otherwise who would bother going to the repair shop?