Logic Board, typical failure

So... I bought a 2011 MacBook Pro on eBay that said the logic board was failed based on advice from a buddy. I’m a novice, so please forgive me. I did the typical “put logic board in the oven” trick. I put a new SSD in it too. After a bunch of messing around, I was able to format the drive and install High Sierra using a bootable USB file I found from my windows. Everything ended up working out great and I was set! Keep in mind, I’m not a computer fixer, so this was a huge win for me! I went to open a program and the laptop started to just continually restart. I call my buddy and he says, yea the fix didn’t take. Go buy a heat gun and heat the GpU up. Long story short, I did, and I heated it up so much that components (resistors or diodes, I don’t know????) on the other side of the logic board fell off. I’m dumb, I get it. I have a great running laptop that just needs a working logic board/GpU. Every search I find wants like $450 for a new logic board, and it’s a 2011 MacBook, I already have enough money in. What is my best option to get this laptop up and running for an affordable rate. I’m willing to spend a few bucks, but not $450. Please help!