Chosen Solution

Iphone 6 shows on the left top corner “Searching” can someone help me what part does need to be replaced and why it hapened.

No part needs to be replaced. This is most likely a baseband CPU issue. On the iPhone 6 you need to remove the baseband IC and run a jumper wire then re-ball and install the IC. This problem happens as the trace involved is on the flex line of the logic board and gets severed due to flexation. You can confirm this by imputing *#06# into your keypad if it doesn’t bring up your IMEI number you have most likely found the problem.