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.