Origineel bericht door: Reece ,
Remove the bottom cover, disconnect everything except the dc board and fan. Plug in the charging cable (it will light up dim green), if the fan spins a different part inside the MacBook is preventing boot. Use process of elimination to find out the faulty part. If it is still not working the issue is with the logic board. Remove the board and check it for liquid damage, cleaning it with 95%+ isopropyl. If it is still not working after the clean, it will need logic board repair which requires certain tools, parts and experience. At this point, unless you have micro soldered before, it is best to send it to a shop.