원문 게시자: Minho ,
So if I understand correctly, the phone worked after the Tristar replacement but before putting the shield back on. Then when you soldered the shield back in place and re-assembled, it wouldn't boot - correct? When you removed the shield to probe (did you?), did the board boot and charge properly or was it permanently dead? I once had a phone that did something similar...it just wouldn't work with the back shield in place. If the shield is currently off, try connecting it with a known-good dock and battery just to see if it boots and is recognized by iTunes. If it isn't, then you have troubleshoot it just like any other dead board. I would consider removing Tristar and trying again as that is the main variable here. But otherwise, you will just have to check all of the voltages. If the shield is still on, try checking the main voltages that you have access to to see if anything is off. If not, then remove the shield and proceed as mentioned above. Report back and we'll see where to look at next.