Mainly iPhone screen and battery repair. I have done...
Just did this.. took all of 10 minutes not including the time it took for the iron to get hot. To replace the battery you only need to work on the left side as said above and you don’t need to de-solder anything from the board. Skip step 4!
In order to keep the battery from rattling around you need to use some double faced foam tape and apply it as it was done on the original battery. Be sure to use heat shrink tubing when you splice so you don’t short against the pcb board.
PS: if you don’t want to get inside the headphones to replace the battery just use a standard usb power bank battery and stuff it in your shirt pocket. Works for hours and hours! I did this for a month waiting to have the time to do the replacement.
Ok a word of caution about doing this. I installed an i7 in my 2010 27" i3 iMac and the system works, it reports the correct stats for the i7 but the cpu fan runs at high speed from boot. Annoying! I've researched a number of forums and found no way to resolve this, I also know there are a number of people with the same problem. So either I screwed up my logic board or it just doesn't like the i7 processor. It's the correct processor that people have used the i7 870. I'm at a loss and don't want to pull it out because it just runs so much faster for video editing but using the machine as an audio workstation is now impossible because of the noise from the fan. Also be extremely careful with the LCD screen. just having your shirt brush against it leaves marks and you can't clean it. If you think gloves will solve this you are wrong. DO NOT touch the lcd and be extremely careful with the connectors. If anyone has any ideas about the fan speed fix please let me know!