Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White.

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Loud speaker does not work. how can I troubleshoot further?

My iPhone 4 suffered water damage where it sat in a puddle of rain water for an hour. I dried it thoroughly in rice for a week but when it was dry, the screen and loudspeaker had stopped working.

I replaced both the screen (LCD + Digitizer) and replaced the entire dock port assembly (Port, ribbon connector, WiFi Antenna, Loud Speaker) and the screen now works, but the loud speaker still does not. The first time I turned it on, the loud speaker did make some distorted noise if I turned the volume up at least half way, but it has stopped making any sound since that initial time.

So as it currently stands, I have EVERYTHING working except for the loud speaker. I tried taking it back apart to make sure the loud speaker is seated properly and that all the screws were tight and everything seems to be installed correctly. I just have no idea how to proceed further and am hoping some of you might have experience with a similar problem.

So here are the facts:

-The phone is absolutely dry. that whole rain thing happened about a month ago and I checked everything when it was apart and there is no moisture in the phone.

-The two connector plates that the loud speaker terminals rest on to make a connection seem to have voltage across them if I touch a volt meter to them when music is playing. EDIT: The voltage here seems quite low compared to measuring the voltage that comes across the headphone jack when outputting to headphones.

-I've checked the headphone jack and proximity sensor to make sure they are both functioning properly and they seem ok.

How should I proceed from here? are there further things I can do to troubleshoot this? Is it possible that another part on the phone needs to be replaced other than the loud speaker (which I already tried replacing)

Any thoughts or ideas would be greatly appreciated. Thank you so much for your time!

Update: I have discovered that if I turn the volume up ALL the way and press the phones speaker into my ear and sit in a quiet room I can hear the sound of the phone... BARELY... like, its so faint that you would never know sound was coming out of it.. I hope this information helps in some way.

Update 2: I took my loudspeaker out and plugged a headphone cord into the headphone jack and touched the loud speakers leads to the other end of the cord and it produced wonderful sound that way, so its not the loudspeaker.

Thanks everyone!

Answer this question I have this problem too

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Heres another weird thing. In regards to being able to hear the loudspeaker BARELY if I press it against my ear... I can hear it regardless of if the phone is switched to silent mode or not.

Silent mode appears to work properly though. It makes the phone vibrate as it should and everything so I'm not sure if that is related to the problem or not... Could the loudspeaker be stuck in a silent mode volume level while the rest of the phone is accepting the silent mode toggles correctly?

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Gave you a + for thorough post, hopefully someone can provide you with good information!

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iv the same problem, and iv also done the same tests as your self , i hope we get the ans were looking for

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Lets make sure to keep all the info we learn here so everyone can benefit from what we discover. I have scoured the internet and there is basically no information about this type of problem at all out there. (Or if there is, its buried under thousands of posts from people complaining that their second "speaker" (microphone) doesn't work and such...) Or, most of the cases that sound close to this end with the person returning the phone to apple, which wont work in this situation.

I have re-confirmed that the speaker on my iPhone started acting up BEFORE the water incident, so I don't believe it is related to that.

I'm even considering hard wiring in some leads from the headphone jack directly down to the loud speaker just to get some sound out of the thing.. Problem is, that not all the phones sounds come through the headphone jack. Some are ONLY come through the loud speaker. Plus there are other problems that arise with that type of setup, but it might be my final desperate action if I cant resolve this.

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have you checked the nearby fuses etc? I'm no iphone 4 expert but in the 3g there are noise reducers/inductors/fuses? near the dock(on the motherboard side) that the speaker is in that can blow and cause these sort of problems..just an idea.

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I have a nearly identical problem with my 3GS. I also had water damage. I also replaced the LCD and the dock port (with integrated speakers). Everything is back, except the speakers.

As a side note, I can live without playing music/video on the speakers. However, I cannot deal with a phone that doesn't ring. I am grateful to have the vibrate function working.

I'm not sure if the original problem description mentions this but on my unit, ALL sound is operable via the headphones. So, since the sound is being processed and the speakers are new, I have to assume that the problem lies somewhere between the sound processor and the speakers themselves. It could be a connection. That will just take some cleaning to determine. But I think it must be something to do with the amplification of the signal.

Can anyone identify the circuitry and components of the iPhone between the signal processor and the speakers? I suspect the amplifier is fried, but I just don't know where to start if I want to replace that.

Thanks in advance to any brilliant minds....

JK

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I would put the logicboard in IPA, chances are the contact is dirty, IPA is not conductive and removes corrosion

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think we missed that one, good catch!

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What are the risks with doing this? is there any possibility this will harm anything? So what would I do here, just remove the logic board and put it in a bowl of Isopropyl alcohol for a few hours and then dry it really good?

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None, it isn't conductive, all it does is remove any corrosion and dirt and it will yield a high success rate

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Okay, so I let the Main Logic Board sit in a 91% Isopropyl Alcohol bath over night and then I connected a massager to the bowl to vibrate the bath sort of like a jewelers cleaner for about 10 minutes. Anyway, I did notice some small specks of who knows what appear in the liquid. Maybe the size of spec of pepper or something. Anyway, I let it dry for a few hours and then I hooked everything back up. Now it actually plays sound... sort of. Its now like it was how I first described where the sound is all distorted and crackly. It only works if I turn it up a bit and then it goes from being silent to very loud/distorted when it finally kicks in. In this new state of "working sound" I have tried switching out both the loud speaker and the dock port assembly and all four pieces have the same results regardless of what combination of parts I use there.

So, this is progress. I now sometimes hear the phone ring, even if it sounds terrible. Any ideas on how to proceed from here? Thanks for your help everyone!!

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Just another update... The sound is unreliable and sometimes plays (in its distorted way) but most of the time is absent.

Any more ideas guys? Thanks for all the help so far!

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I just thought of something. When the headphones are plugged into the jack, the speakers are disabled. If there is a short somewhere in that jack... well that could disable the speakers. I'll try to remove and replace my headphone jack with another unit and will see if that has any effect. Fingers are crossed! JK

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Hey Jonathan, Thanks for your reply. Please let me know if you figure anything out. I've just about hit a dead end. The only thing I can think of trying at this point is a reflow with a heat gun, but I feel like the risk to the other components isn't worth the potential benefit.

My next attempt at a work around is going to be building a little speaker dongle that just plugs into my headphone jack. I have purchased a mono jack plug from radio shack and I have a spare loudspeaker. I'm just going to cut down the loud speaker and soldier it to the jack and make some sort of small enclosure with it (filled with hot glue) I will have the annoyance of a half inch thing plugged into the phone, but at least I will be able to hear the phone ring and enjoy sound from my apps again. (even if it is at a reduced volume level.)

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We're in the same boat, Blake. I bought a new headphone jack assembly ($12) on eBay. When it arrives and I install it, I'll report back. I expect this will be my "dead end".

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Yes, please let me know how it goes. I built the external speaker dongle last night. It turned out pretty good. I just cut down an iphone 4 loud speaker, wired it to a mono jack from Radio Shack, and then hot glued it into a binder clip I customized to fit it all into a small little dongle I can just plug and unplug as needed. You can see pictures here: https://twitter.com/#!/blakepro/status/1... It turned out pretty good. Sound is not as loud or clear as it would be using the real loud speaker circut, and ringtones are significantly quieter, but this is better than nothing and I consider it to be the next best thing. Hopefully my pictures may help you build something similar if you end up needing to. I'm still hoping that I may stumble into someone that has figured out our problem and do a REAL fix at that time, but for now, this is what I'm using.

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I had the same speaker issues after my IPhone 4 took a bath in my sink. I noticed that when using the volume switches the OSD told me it is adjusting headphone levels, when no headphones were plugged in. Airplay aswell showed headphones when there were none plugged. I could do calls with headset but no sound came through phonespeaker and loudspeaker. I assumed that "something" in the headphone jack "told" the phone there was a headset present when it wasn't. So I did a "deepclean" of the jack with tissues, toothpick, airblower and hairdryer and you know what: it came back to life!

yours @haeckmac

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When I adjust volume levels on my 3GS, it does not say "(headphones)" when no headphones were plugged in. It says "(ringer)". I tried cleaning the jack as you did, haeckmac, but no change. The speakers are still dead. And yes, these speakers are newly removed and replaced, but they still do not work. Thank you for the post/info. I'm glad you got yours back. I am still waiting for my new headphone jack assembly to arrive. Will report back when installed. I'm not as hopeful after reading your experience, however.

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Hi

I am a newbie here so hopefully I'm not teaching you guys to suck eggs !

I remember having some sound issues with my iphone 4 under an earlier software version. Sometimes there would intermittently be no sound. I noticed that when I pressed the volume up/down buttons the ringer icon appeared on screen with (headphones) as if the phone thought headphones were connected. I used to "confuse" the phone into working again by pressing the volume buttons and plugging in/out the heaphones until came back.

Give it a try it might work.

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There is pin size hole on top of the phone next to the head phone jack blow some air in there and if that doesnt work replace the head phone jack assembly. I just had the same problem with when you can barely hear thru the loud speaker

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So it's 5 months later now, did the suggestion of michael work? I am eager to know how this story ended! ;)

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No, unfortunately Michaels suggestion did not work. My unfortunate solution was to take a mono headphone jack and wire it directly to a iPhone 4 loudspeaker that I cut down to be as small as possible. I glued the contraption inside of a binder clip and just left the little thing plugged into the top of my phone at all times. It wasn't ideal, but I could at least hear it ring and hear various apps and stuff.

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Okay, I don't know if this is going to help or hinder but I just had to replace the charging port assembly (iPhone 3G) and after re-assembling everything worked except the loudspeaker, hence me reading this in the hope of an answer.

I plugged headphones in and I could listen to the iPOD but still the speaker did not work. I tried ringing the phone but loudspeaker still did not work. Then I attached headphones and browsed throgh settings to where you change ringtones and selected a different ringtone. I could hear the ringtone through the headphones but also through the loudspeaker?!?. I took out the headphones and the speaker continued to work, then I re-insterted headphones and the loudspeaker stopped while the headphones played the sound.

Now, for some unknown reason, the loudspeaker works fine!?!?!? (don't ask me, because I don't know).

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Hi Blake,

did you ever solved this problem? I have the same problem with my iPhone 4 but without water damage. Any feedback would be great. :)

Regards

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Hey, sorry. No, I never found a solution to really fix this issue. I ended up taking a spare iphone 4 loud speaker, cutting it down to just the speaker and terminals, wiring it to a mono headphone jack and then hot glue gunning it into a binder clip to create a headphone loud speaker dongle that I could just leave plugged into the top of the phone all of the time. It was not elegant, it was not as loud as I hoped, but it did get the job done. I wish you luck!

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Did anyone manage to solve this. I have exact same issue :-(

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blakepro will be eternally grateful.
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