Iphone 5c Mic Advice Please

  prejump 14:34 25 Aug 2017

Hi, Im fairly new to repairing iphones. Largely its been going well, but I've come across a right pain. I was replacing a screen including swapping small parts. Once built the ear piece mic wasnt working correctly. I was testing on video cam & voice memo. I either get static, no audio pic up at all, or it works perfectly. It can be just static, give it 1 hour, then could work perfectly no static at all. Ive replaced the mic, cleaned the connections with rubbing alcohol. Tried with & without the litte rubber boot. Tried without the metal plate which covers the connections to phone. The ear piece speaker is fine, selfie camera is fine. I not sure what else to do ? Could it be a main board issue ? Something could be interfering somewhere maybe ? Any ideas appreciated. Thanks

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