Seeing the damaged traces are giving me goosebumps, sorry i have to say this, you're damaging the tuner more and more instead of repairing it ... its a messy job
To help you, i have to be frank, that's not intended to insult, nor offend you, that is a learning process.
You should practice on dead boards, practice and develop soldering skills IE: good iron temperature, working with copper wick, or an vacuum pump to de-solder parts, learn to read schematics and symbols, parts functions, read books, see some youtube videos ... learn to use tests equipment's, understanding read values etc ...
Sure in life you have to start somewhere, but not on equipment you want to make work as a start.
Even with tons of experience (30 years in my case) you may damage some parts or equipment, i had this happened to me recently. We tend to be overconfident sometimes. Doing things too fast, overlook things or don't look well enough, we automate our judgment, do mechanical / repetitive movements without thinking etc etc... the list goes on and on.
Members here are trying to help you, it is not easy, we may use technical terms or see thing differently EX: it would take maybe 10 minutes or less to see what is the problem in your tuner for experienced people. This is a very basic tuner, nothing fancy.
Even the only pin soldered may be bad, the pcb trace may be cut where the solder is ...
Do you have a friend who's knowledgeable in electronics, or some professors at school, an nearby shop who could help you understand