version 8.2 LCD replaced searching no signal

so i recently replace one of my iphone 4s LCD normal task for me and ive never had an issue until this phone. i cant get a signal it just says searching or no signal. ive tried nearly everything ive seen online youtube and all. still no signal nothing on the phone is missing and everything is up and working besides the signal. its really bothering me that no one elses fixes work when i try them. so if anyone can help me it would be greatly appreciated.

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