I recently repaired the logic board on my 2013 MacBook Air by baking it in the oven to reflow the solder. I thought I was being trolled when I first came across the advice on a forum but it worked! However the fix only lasted around 2 weeks before the issue came back and the laptop wouldn’t turn on anymore. Now I’m probably going to buy a second hand logic board off eBay and swap it out, they look to be selling for around £100