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I've had used boards that failed shortly after installation. I have also gotten boards from ebay that said they were tested and arrived with a blown fuse. And some boards will work for years. They fail because they are run at their limits and get very hot, Best not to try a chip replacement yourself the first time. I took me awhile to get it down without damage. It's not as straight forward as you may think. A bad or partially shorted screen of buffers on the verge of failure can also cause boards to fail. LG made buffers hold up better than Samsung buffers by far. Samsung buffers usually fail first and take out the Y-sus and then it becomes very expensive very fast.
IPM's usually fail with a large bang that immediately blows the fuse but the set will generally stay running. Usually only one goes bad but sometimes both go bad.
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