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Repair information and guides for the fifth generation of iPhone. Model: A1387

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Microphone not working ONLY on video recording DX HELP!

I'm pretty confused and somewhat dismayed. I have just repaired my friend's mom's screen on her broken iPhone 4S. The screen works beautifully, can make calls and receive calls, and hear the microphone on both ends. Voice memos work. Now, the problem is, as I am about to give the phone back to my friend to give to his mom, it is not fully working. The microphone does not work properly when recording a video. I have searched and searched and searched for a solution or a similar problem as to this, nothing. The dismaying part is that I am going to be assertive and tell him what is wrong with it, and not leave it unfinished. Without a solution, I am very upset with my work as I try to handle something like this in the most professional manner. I am very very confused and would really like some advice, I don't even know which microphone to replace, or if it even is a microphone?? it shouldn't be because the microphone works! Someone, with experience please respond! is there an ifixit phone number I can call?

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Whenever I video with the front camera I hear no audio , also when I'm videoing with the back camera I still don't hear any audio. It only works for the back camera on whatsapp whenever I'm videoing .... What could be the problem ?

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This is such a common problem, but there are two opposite symptom sets. One is that the mic does not work with the phone, Skype, and memo, and the other is that it does not work with video or speakerphone.

I experienced the second after replacing a bad power switch assembly. I went back in to replace a bad home switch and I tried the common youtoob fixes which are clean the small mic hole next to the headphone jack and the extra cardboard to put pressure on the motherboard audio chip, neither of which worked for me.

A search yields info that this is a known problem with the audio chip on the motherboard, which ifixit notes in other answers. The chip loses some PCB connections, and the probability goes towards losing phone mic. We went in and fixed our phone problems, just like apple repair would, and disturbed the mo-board enough to disturb the chip. But we don't have replacement motherboards to pop in like they do if the mic does not work, or probably with every fix because of the high probability of the chip problem. That's my opinion as a 25 year audio tech.

There is a utoob video showing someone re-working the chip, but that's too deep for me.

Mike, did the new headphone jack sort your problem?

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I replaced my headphone jack/upper mic through a 3rd party store, problem persists and technician says the issue is a faulty chip handling the upper mic

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Yes it did! Apparently there is an ambient background noise microphone attached to the headphone jack. When I replaced it everything worked perfect!

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I am having the same problem with mine. When i took mine apart, I think I broke the headphone jack assembly. It also includes a secondary mic for noise reduction. I'm assuming this is the same one used for speakerphone calls and video, which both don't work on my phone anymore. I just ordered it. Hope this helps!

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Thank you mike, I appreciate your answer. I have a similar malfunction with a white 4 cdma, where the voice memo works but not the video recording. I purchased a new headphone jack/microphone already and am going to test it out now. I'll update you on the results. Its a real PITA to get that top right screw out i tell ya..

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Do we have any update on this issue?

I have a 4s with a noisy microphone during calls, but when you enable sound over speakers, the sound is fine.

Any suggestions?

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I have a problem alike, people cant here me wen i call them, and with Dictaphone sound recording i don't hear must more than pink noise. When i use speaker it works perfectly?

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Just to make sure, the headphone jack they have here for sale (part 821-1336-A) is the one that needs to be replaced on this situation where the phone mic works normally (for phone calls) but the mic for video recording and facetime does not work.

Just double-checking so I can purchase the right part. Tks!

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The part that needs to be replaced is the headphone jack /volume control. There is a secondary Mic on it next to headphone jack.

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iphone 4 cdma:

the tab under the right headphone jack screw tore on mine and the top mic don't work. the part number on the flex cable piece is 821-1294a and I haven't been able to locate it. i'm wondering if this piece is from the headphone jack flex cable or from another flex in the same area. humm.

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an update: i found out that the flex cable i wrote about comes with the mid-frame for my iphone4. this is the cable that none of the distributors are aware of, until july 2014... any program that uses the top mic is effected. as for shooting videos with the camera app, there's an app called 'FiLMiC Pro' that uses the bottom mic instead of the top. there must be others but this one is pretty cool. it would be nice if there was a software switch to select between the two mic's but apple left that one off the 'wish list' :)

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Alright booooys. Got the same problem where the mic doesn't work when recording a video only. Not sure what to do. Wha's gwanin?

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take a look at this easiest way https://www.youtube.com/watch?v=Fvtxp8Va...

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I'm having a similar problem.

The mic works fine when I am recording voice memos or using siri but there is no sound other than some noise when I use speakerphone during calls, or when using skype speakerphone or even recording a video.

Can someone guide me on whether replacing the headphone jack assembly would fix my set or not because I am wondering why the memos and siri can use the mic and not the rest of the apps.

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https://www.youtube.com/watch?v=Fvtxp8Va...

Check out this video 100% solution easy without tearing apart your iphone.

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remove the plastic cover on the camera , MIC. Between cam and flash remove the plastic cover and record video

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I had this same problem. All I had to do was clean out the microphone. Located next to the headphone jack on 4. Next to the camera on 5. I just took a needle and scooped the gunk out! Saved me a lot of money!

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Aaron zal eeuwig dankbaar zijn.
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