Hi, My logic board failed again. The first two replacements were on Apple but now that the machine is vintage I can't even get a new board from Apple at my own expense. I am presently running on the EFI fix but am not convinced it is working completely. (I have intermittent issues with start up, occasional black screens that take 20 tries to get past.) So I was looking into having the board "Re-balled." At least I think that is the term. I am still not clear whether it is the actual 6770M chip that fails or just the lead free solder that is holding it in place. I know the lawsuits blamed the problem on the lead-free solder but did it actually damage the chip along the way? Now, I live in Eastern Europe, so not a wide variety of options here. Although they can be resourceful. I emailed a place that specializes in repairing motherboards of all kinds. I explained the lead-free issue to him and I got the response below. He wants to replace the 6770M with a 7490M. He thinks its a problem common to many discrete GPU's, says it has nothing to do with the lead-free solder. I don't get the feeling he deals with a lot of Macs. I don't know how to read chip specs. Here are the links. https://www.notebookcheck.net/AMD-Radeon-HD-7490M.70621.0.html https://www.notebookcheck.net/AMD-Radeon-HD-6770M.43955.0.html So, Is the 7490M actually a step down? Should I just ask him to re-solder the existing 6770M with proper solder? Should I try to find a replacement 6770M somehow? Is there another chip that would be a suitable replacement with the same or better performance? Thank you, MBPro17 His response: ======================== The problem you have experienced is one of the most common problems not only with apple but all logic boards that use AMD and nVIDIA graphic chips and other chipsets. The problem is not with soldering but with the construction and production of the chips. There is a lot of science behind this problem but to be concise, there is a very easy way to justify this claim: You may use your hairdrier to put a little heat on the silicon head of the chip and after a few minutes of heating your chip will be working again for short period of time. You most certainly haven't resolder anything but it is working. That proves that problem is the chip itself and not the solder balls. We change dozens of chips of that sort every month. We put only brand new and original chips with production codes refering to the year 2016 and 2017. Unfortunately the exact chip you have in your Mac the producers do not produce any longer for the unknown reason. Nevertheless, there are interchangable chips with yours that are going to work just fine for very long period of time if not for many years after repair (with orderly cleaning from dust and changing thermal pase). The available chips are Radeon HD7490. No changes to the board itself or to the bios are not required. The price including both labour and parts is 150 euros. We offer you 6 months basic warranty or 12 months of extended warranty that costs 20 euros more to the price.