Permanently Fix SGS2 Echo and Digital Noise Reduction/Cancellation Problems

Hi All

I spent the last 2 days trying to find a simple solution to this problem. Even though my phone is still under manufacturers warranty and Service Providers warranty I decided to just do this as working carefully there will be no indication that the phone has been opened or the "fix" has been applied

I for one couldn't take my phone to a service centre as they would have booked in my phone and gave me some Nokia 3100 knock-off budget phone for one and the repair would have taken 21 days and having business requirements that my phone needs to meet I decided to just do it myself.

So I decided to open it up myself and fix it and here is the guide on how to permanently fix the echo that people get when phoning you.

Problem:
When you receive or make a call people on the other end of the line hear a echo of themselves and this might be intermittent but seem to be worse when having any type of cover on the phone.

Reason:
The reason this occurs is because the speaker depicted in the 3rd photo labelled as "B" has a rubber seal at the bottom of it that has gone loose from the casing by either a drop or some vibration that is making the speaker's sound go into the phone and picked up by the NC (Noise cancellation) microphone shown in the same photo as "A" rather than be isolated and out the speaker hole on the front of the phone.

Fix:
This fix is fairly simple and permanent. You only need a 5mm x 12mm piece of cardboard or think paper that is around 0.5mm thick that can be used as a buffer.

Procedure:

Step 1:
Picture 1 Shows the phone screws that should be removed 1st depicted by round red circles. Keep the screws in the same order as you remove them as only 4 of the 7 screws have locktite on them and be sure when you replace them you put them back in the same position.

Step 2:
Picture 1 As depicted from 1 to 6 is the easiest way to follow to unclip your back and front cover from one another to not break any of the clips. The back cover is very rugged so don't be afraid to unclip it as it is unlikely to break.

See Below Picture no1


Step 3:
Picture 2 is how it should look like when the back cover has been removed. We will only be focused on the area in the red block called ZZ

See Below Picture no2

Step 4:
Picture 3 shows the 2 components that's interfering with one another. "A" is the NC microphone sensor. Be sure to check that the sensor is properly inserted into the rubber sleeve covering it. "B" is the speaker and is glued with some ridiculously little amount of glue into the housing of "B" and can be lifted with a tweezers or some small object to be able to lift it out of the housing in "B"

See Below Picture no3


Step 5:
Picture 4 Loosen the speaker by just moving it in this aspect north and south a bit until it can be lifted up. Please note the arrow as it flips the way the arrow is pointing to expose the casing it is housed in. Clean out the housing of any dirt and wipe the speaker off as well of any dirt or substance that might elevate the speaker a little bit in its housing.

Step 6:
Picture 4 Flip the speaker back into its housing and firmly press it down so that it seats itself well in the housing. The rubber that the speaker is surrounded with should press firmly in the housing to seal it of any noise coming into the phone.

See Below Picture no4


Step 7:
This is where you use the piece of cardboard or thick paper of 5mm x 12mm by 0.5mm thick and place it over the speaker. I recommend cutting up a business card as they are the correct thickness. When looking at Picture 4 the cardboard should be covering the whole red block as depicted by "C" and should look like Picture 5 when placed

See Below Picture no5


Step 8:
Close up the phone and screw everything back together. The piece of cardboard or thick paper will ensure that the casing press the speaker tightly in place and keep it there without letting it leak into the phone to cause the echo effect for people calling you.

Step 9:
Enjoy calls without any echo effect.

This is all very simple to do and my echo has gone away completely. The replacement part they are referencing to in other topics is not really the problem and has nothing to do with it. In the process of replacing that part the speaker gets loosened and removed out of the housing and upon putting the phone back together they securely glue the speaker back in place and thats why they get the same results.

If this guide helped please post and say so. The problem has no relation to software or anything other than the speaker leaking sound into the phone being picked up by the NC.

Hope this helps. My phone is working 100% without any issues.

So I want to make some summary. If you have echo:

INSTRUCTION


0. Try to update yr phone to ANDROID 4 & check if echo is gone, if its not help go to step 1. (added on 03 May 2012)

1. Prepare tools as on picture attached.

1. Open yr phone (by screwdriver & piece of sharped plastic card)

2. Check if original rubber casing that covers the BOTH microphones is fit tight. To be SURE remove the covering over NC Microphone sensor (upper mic (part A) on picture below) completely, put it back ensuring that mic is completely inside the rubber casing, then press it firmly in housing. Take a great care with sensitive parts!

2a. On the lower side of phone there is another mic, it has same rubber covering like Part A but gray color - make the same remove rubber casing completely, put it back ensuring that mic is completely inside the rubber casing, then press it firmly in housing(check very attentively, use light, magnifier & tweezers if you need).

Close the phone.

3. Check if echo is gone. If No proceed to (4).

4. Open yr phone again & put piece of business card over speaker (as described on picture below.
As per toxicdust instruction http://xdaforums.com/showpost.php?p=21314046&postcount=1
(but do not cover golden contact from right side of the speaker!!!)

Close the phone.

5. Check if echo is gone. If No proceed to (6).

6. Open the phone & put pieces of rubber as was described on the picture below. DO NOT USE LATEX AS IT CAN BE DESTROYED DURING SHORT TIME - USE LONG LIFE RUBBER!

Close the phone.

7. Check if echo is gone. If No repeat all steps again (more attentively because U are the professional already ).

For more detail information look upper posts of snigade , Toxicdust & Vitsa.

Do not forget to press thanks button & pls make some remarks in this topic about yr results, it will help other users.

I have made some useful picture pls check it - hopefully this will help to stop echo...

By the way some guys going to use balloons. Balloons made from LATEX!!! Do not use it! Latex can be destroyed during year or two.
Also do not use latex gloves & other latex products

Better slice by sharp blade thin piece from some rubber washer or other "LONG LIFE" rubber.

Only rubber (or paper) over speaker does not help on most cases.

Also pay attention that original rubber that covers the microphones (upper & lower) it should be fit tight!!! (I describe it on my picture)

EQUANT said:

I tested 3 different brand new phones and all had the issue. Does this mean that Samsung fails to correctly assemble all of it's phones?!

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Think about it this way. Anything comes loose with vibration. Maybe the delivery company man handled the boxes a bit on delivery or the vibration on the phone itself while being shipped could have loosened it as well.

Remember the Speaker needs to be completely sealed off from the internals of the phone and that's why you need the buffer so that the casing can keep it firmly pressed in place and sealed off from the internals.

Been on the phone a lot today and every person I ask tells me there is absolutely no echo.

And that coming from a 100% guaranteed echo for the last month

manmad said:

so, anyone else tested this?

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I would seem that ppl will probably do it and then not come back to post it worked because my "Thank You" count went up yet no replies

If your phone does this why not just do it? You have nothing to lose